Whatnot Seller Taxes: The Complete CPA Guide for Collectible Resellers

A Form 1099-K threshold does not determine whether a sale is reportable. Business sellers generally report gross receipts and then account for supported returns, cost of goods sold, fees, and other expenses; a personal item sold at a loss and a hobby activity can follow different rules. Whatnot pays sellers out through a connected Stripe account or through PayPal, and Whatnot issues its Form 1099-K only through Stripe (Whatnot Help Center, "2025 Form 1099-K for U.S. Sellers", read September 7, 2026). The federal Form 1099-K threshold is more than $20,000 in gross payments and more than 200 transactions, while New Jersey has a separate $1,000 state threshold. Reconcile any form to platform, inventory, refund, fee, and bank records rather than treating either the gross form or net payout as taxable profit.

This guide covers collectible resellers at every level - from someone flipping $200 in Pokémon cards on a weekend stream to six-figure sports card operations running simultaneous Whatnot, eBay, and Mercari shops. The most common tax mistakes are remarkably consistent: reporting net deposits instead of gross 1099-K amounts, failing to track cost basis on inventory purchased at card shows and from breaks, ignoring grading fees that should be capitalized to the card's basis, and skipping quarterly estimated payments until penalties arrive. This guide addresses every one of those mistakes with specific IRC citations and practical solutions.

This guide covers the complete tax picture with IRC citations and practical solutions. Tax law and figures in this guide are stated as of September 2026. Platform fee numbers were checked against Whatnot's seller-fee page on September 7, 2026 and change frequently - always verify against Whatnot's live fee page before relying on them. Examples use tax year 2026 assumptions unless labeled otherwise. For resellers who also sell on Poshmark, eBay, Depop, and similar platforms, the complete reseller tax guide covers those platforms in detail.

In This Article

1. How Whatnot Works and Why It Creates Unique Tax Issues
2. The 1099-K: What Whatnot Reports and What You Actually Owe
3. COGS for Collectibles: Cost Basis Tracking for Cards, Comics, and Sneakers
4. Grading Fees: COGS or Business Expense?
5. Hobby vs. Business: The IRC 183 Nine-Factor Test
6. Income Scenarios at Five Revenue Levels
7. Common Mistakes That Cost Whatnot Sellers Thousands
8. NJ-Specific Tax Rules for Collectible Sellers
9. Every Deduction You Can Claim
10. Entity Structure: Sole Prop to LLC to S-Corp
11. Frequently Asked Questions

How Whatnot Works and Why It Creates Unique Tax Issues

Whatnot is a live auction marketplace where sellers stream in real time to sell sports cards, Pokémon cards, trading cards, comics, sneakers, vintage toys, coins, and other collectibles. Unlike a fixed-price listing on eBay or Mercari, Whatnot combines entertainment with commerce - sellers run live shows, break sealed product on camera, and auction individual items to engaged audiences. This live-selling model creates specific tax complications that do not exist on traditional resale platforms.

Use the seller's actual statements, not a published fee example. Commission, processing, promotion, refund, chargeback, shipping, tax, and payout terms can vary by category, transaction, seller status, and date. Download the annual and transaction-level records, identify which charges the seller actually bore, and reconcile them to gross receipts and bank deposits before classifying any expense.

Sales-tax treatment is transaction- and jurisdiction-specific. Verify the current contract, what the platform actually collected, marketplace-facilitator coverage, product taxability, sourcing, seller relief, registration, and return requirements in each jurisdiction. Platform-facilitated sales and direct or in-person sales can create different duties, and tax charged on seller fees must be reconciled from the actual statement.

The live auction format creates a unique COGS challenge. A card breaker purchases a $500 sealed box, sells 30 spots at various prices totaling $750, opens cards live, and ships cards to spot holders. The cost basis allocation across spots, retained cards, and unsold inventory requires careful tracking that most sellers never establish from day one. I will cover the mechanics in the COGS section below.

The 1099-K: What Whatnot Reports and What You Actually Owe

Check the information return actually issued, its payer, covered transactions, and amount, then reconcile it to the platform, processor, inventory, refund, fee, and bank records. Statutory federal and state filing thresholds govern the payer's reporting duty, not whether the seller must report income; payment-card and third-party-network transactions can also follow different reporting rules.

What the 1099-K includes: Gross transaction amounts including shipping charges collected from buyers, before deducting commissions, processing fees, refunds, or chargebacks. Whatnot's 1099-K article does not say whether buyer-paid sales tax that Whatnot collects as marketplace facilitator sits inside Box 1a. Compare Box 1a to the gross-sales line of your annual Seller Statement and treat any difference as a reconciling item to explain, not an assumption to make.

Where to find your tax documents: The 1099-K appears in the Tax Documents tab in Seller Hub. Your Annual Seller Statement - the true source of truth for fee reconciliation - is located under Seller Statements in the Finances section. Which form you receive follows your payout rail, not the size of any one cash-out: Whatnot issues its 1099-K through Stripe only to sellers with a connected Stripe account who meet a federal or state threshold; a seller who cashes out only through PayPal gets no Whatnot form but may get one from PayPal; a seller who used both may receive two forms covering different payments. Reconcile any form actually issued for covered payment-settlement transactions to the same underlying sales so overlapping forms are not double-counted.

State information-return thresholds and filing mechanics can differ from federal law and can change. Apply the current rule for the payee, payer, transaction type, and state rather than relying on a multistate threshold list. New Jersey's rule should be checked against current Division guidance for the tax year.

The reconciliation on Schedule C works as follows: Report the full 1099-K amount (or your actual gross if higher) on Line 1 (Gross Receipts). Report returns and allowances on Line 2. Cost of Goods Sold flows through Part III to Line 4. Platform fees, shipping costs, and processing fees are deducted as business expenses in Part II. The result on Line 31 (Net Profit) is your actual taxable amount. For a complete walkthrough on handling a 1099-K, see my 1099-K guide.

The reconciliation risk: Reporting only bank deposits can leave the Form 1099-K gross amount unexplained and may increase automated-matching or examination risk. A CP2000, if issued, is a proposed adjustment rather than a final bill. Reconcile gross receipts to returns, cost of goods sold, platform and processing fees, chargebacks, and payouts; seek correction of an erroneous form and keep the supporting records.

COGS for Collectibles: Cost Basis Tracking for Cards, Comics, and Sneakers

Cost of Goods Sold is typically the single largest deduction for Whatnot sellers, and it is the one most people get wrong. COGS is calculated on Schedule C, Part III (Lines 35-42) and flows to Line 4 of Part I, reducing gross income before any other deductions are applied.

The formula: Beginning Inventory + Purchases - Ending Inventory = COGS.

Under IRC Section 1012(a), basis equals cost. Most Whatnot sellers qualify as small business taxpayers under IRC Section 471(c) (opens in a new tab) (average gross receipts of $32 million or less for 2026), which allows simplified inventory treatment: cash method accounting, inventory treated as non-incidental materials and supplies under Treas. Reg. Section 1.162-3, and complete exemption from UNICAP rules under IRC Section 263A.

Cost Basis for Individual Card Purchases

When you buy a single graded card at a card show for $150 and sell it on Whatnot for $300, the basis is straightforward: $150 is your COGS for that item. Keep the receipt, photograph it if it is thermal paper (it will fade), and log it in your tracking system with a description matching the card.

Cost Basis for Sealed Product and Breaks

This is where COGS gets complicated. When a card breaker purchases a sealed box of sports cards for $500 and sells spots to 30 participants, the box cost, less any basis allocated to cards the breaker keeps, is COGS against the break's total spot revenue. No allocation among individual spots is needed - the break is one sale for this purpose. If you sold 30 spots totaling $750 and kept nothing, your COGS for that break is $500 and your gross profit is $250, before fees.

Cards the breaker retains have a basis equal to their proportional share of the box cost under Treas. Reg. Section 1.61-6(a). If you keep a card from a $500 box that contained 300 cards, and the retained card's fair market value represents roughly 10% of the total value pulled, its allocated basis is approximately $50. That allocated cost cannot be claimed as COGS in the current year - it remains in ending inventory. If you later sell the retained card, the allocated basis determines your gain or loss.

Cost Basis for Lot Purchases

When you buy a bulk lot of 200 cards for $400 at a card show, Treas. Reg. Section 1.61-6(a) requires equitable apportionment. Two approaches are defensible: equal allocation when items are substantially similar (200 commons at $2 each) and relative fair market value allocation when items have disparate values. If the lot contains a card worth $100 and 199 commons worth $1.50 total each, the FMV method allocates more basis to the valuable card proportionally. Use the method that best reflects economic reality and apply it consistently.

The Cohan Rule for Missing Records

When you can prove an expense was incurred but cannot substantiate the exact amount, Cohan v. Commissioner (39 F.2d 540, 2d Cir. 1930) allows courts to estimate a reasonable basis. Courts have sometimes extended the same estimation to cost basis, but not always, so it is no substitute for a purchase record. Historical pricing databases - PSA auction prices, eBay sold listings, Beckett guides, COMC data, 130point.com - can provide the rational basis required for Cohan estimation. This is a last resort, not a planning strategy. Track everything from day one.

Grading Fees: COGS or Business Expense?

PSA, BGS (Beckett Grading Services), CGC (Certified Guaranty Company for comics), and SGC submission fees create a tax classification question that depends on timing.

If the graded card is sold in the same tax year it was graded, the grading fee can be expensed as an ordinary and necessary business expense under IRC Section 162(a) (opens in a new tab). Report it on Schedule C as a business expense.

If the graded card remains in inventory at year-end, the conservative treatment is to capitalize the grading fee to the card's basis - add it to your cost of the card - and recover it as COGS when the card sells. Small-business sellers exempt from IRC Section 263A (opens in a new tab) under Section 471(c) are not forced there by that section; whether a post-purchase grading fee is part of the item's cost is a method question, so pick one treatment and apply it consistently.

Practical example: You buy a raw Pokémon card for $50, pay PSA $30 to grade it, and it comes back a PSA 10. If you sell it on Whatnot in the same year for $500, you can either (a) claim $50 COGS plus $30 grading expense, or (b) claim $80 COGS. The tax result is identical. But if that PSA 10 sits in your inventory on December 31, the conservative course is to carry the $30 grading fee in the card's $80 basis rather than expense it currently. Most small-business card sellers are exempt from the UNICAP rules, so this is a consistency choice, not a Section 263A mandate.

Hobby vs. Business: The IRC Section 183 Nine-Factor Test

This classification is the single most consequential determination for collectible sellers. For tax year 2025, income from an activity not engaged in for profit is reported on Schedule 1, Part I, Line 8j (opens in a new tab). Use the form and instructions for the filing year. A hobbyist may still recover cost of goods sold (the basis of the items actually sold) against the sale proceeds - what is disallowed is every operating and selling expense (platform fees, shipping, supplies, mileage, home office). The Tax Cuts and Jobs Act suspended miscellaneous itemized deductions (the only category that historically allowed hobby operating-expense deductions) through 2025, and the OBBBA permanently eliminated them. The hobby expense trap is now permanent, not temporary.

Classification can materially change the treatment of selling and operating expenses. A numerical result cannot be inferred from gross sales alone: basis recovery, Section 183, trade-or-business status, self-employment tax, other income, deductions, credits, and state law all affect the return. Apply the classification from the evidence rather than whichever treatment appears to produce less tax.

Under business classification, ordinary and necessary expenses are deductible on Schedule C under IRC Section 162. Schedule C profit generally receives the 92.35% Schedule SE adjustment; the resulting net earnings are subject to the regular 12.4% Social Security and 2.9% Medicare rates, with the Social Security component limited by the remaining wage base. The employer-equivalent portion of regular SE tax is generally deductible above the line under IRC Section 164(f). Classification follows the facts, not whichever result produces less tax.

The Nine Factors Under Treasury Regulation Section 1.183-2(b)

No single factor is determinative, and a numerical majority does not decide the outcome:

1. Manner of carrying on the activity (Section 1.183-2(b)(1)): Maintaining books, records, a separate bank account, and operating in a businesslike manner. Card sellers should use accounting software, track every purchase and sale, and maintain organized inventory records.

2. Expertise of the taxpayer or advisors (Section 1.183-2(b)(2)): Studying market trends, understanding grading standards, and consulting a CPA. The regulation directs attention to preparation through study of the activity's accepted business and economic practices, so product knowledge on its own carries less weight than business and economic expertise.

3. Time and effort expended (Section 1.183-2(b)(3)): Running regular Whatnot live streams on a set schedule, sourcing inventory, packaging, and shipping can evidence substantial time and effort.

4. Expectation of asset appreciation (Section 1.183-2(b)(4)): Holding graded vintage cards or sealed wax products that historically appreciate supports profit motive.

5. Success in similar activities (Section 1.183-2(b)(5)): Prior profitable experience on eBay, Mercari, or at card shows counts in your favor.

6. History of income or losses (Section 1.183-2(b)(6)): Continued losses beyond a normal startup period are problematic, though a documented market downturn or other customary business reverse can explain temporary losses.

7. Amount of occasional profits (Section 1.183-2(b)(7)): A single high-value pull or a price spike that generates a large profit in one year carries significant weight.

8. Financial status of the taxpayer (Section 1.183-2(b)(8)): Substantial other income combined with consistent card-selling losses may indicate, in the regulation's words, that the activity is not engaged in for profit - the losses are cushioning other income.

9. Elements of personal pleasure (Section 1.183-2(b)(9)): The governing language comes from Jackson v. Commissioner, 59 T.C. 312, 317 (1972): "suffering has never been made a prerequisite to deductibility." The Seventh Circuit applied the same principle in Roberts v. Commissioner, 820 F.3d 247 (7th Cir. 2016). Enjoyment is relevant but does not decide the inquiry.

The 3-Out-of-5-Year Rebuttable Presumption

If gross income exceeds attributable deductions in 3 of the last 5 consecutive years (IRC Section 183(d) (opens in a new tab)), a rebuttable presumption applies only to whether the activity was engaged in for profit unless the IRS establishes otherwise. It is not a safe harbor: failing the test creates no contrary hobby presumption, and meeting it does not by itself establish a Section 162 trade or business or Schedule C treatment. Profit motive otherwise turns on the nine non-exclusive factors above; no factor or numerical majority controls. Form 5213 can postpone the determination and has statute-of-limitations consequences, so filing it requires return-specific advice.

Income Scenarios at Five Revenue Levels

All calculations use confirmed 2026 parameters: standard deduction of $16,100 single / $32,200 MFJ, Social Security wage base of $184,500, and post-OBBBA brackets. Schedule C profit is generally multiplied by 92.35% on Schedule SE to determine net earnings; the regular 12.4% Social Security and 2.9% Medicare rates then apply, subject to the remaining wage base. The QBI deduction under IRC Section 199A is now permanent. Collectible reselling generally is not an SSTB, but required QBI reductions, the taxable-income ceiling, and wage/property limits still apply.

The side-hustle scenario assumes $75,000 of W-2 wages and shows the approximately $249 of additional federal income tax attributable to the Whatnot activity after the deductible half of SE tax and QBI. The 2026 figures apply the Section 199A(i) $400 minimum deduction where 20% of QBI would otherwise be smaller, which assumes the seller materially participates. At the part-time level and above, the table assumes no other income. Effective rate includes regular SE tax and federal income tax on the Whatnot net profit, but not Additional Medicare Tax, credits, or state tax. Use the SE tax calculator to model your facts.

Key takeaway from this table: The federal burden depends heavily on other income: the modeled $1,650 side-hustle profit bears about a 29.2% incremental federal burden because the owner already has $75,000 of wages, while the no-other-income examples follow different brackets and deduction limits. Documented COGS and business expenses reduce Schedule C profit. An S-Corp result cannot be inferred from revenue or profit alone; use the S-Corp calculator as a starting point for a full-return model.

Common Mistakes That Cost Whatnot Sellers Thousands

These are the most common errors on Whatnot seller returns. Every one of them is avoidable.

1. Reporting Net Deposits Instead of Gross 1099-K Amounts

Potential issue: a gross-to-net reporting mismatch and any resulting tax, interest, or penalty consequences

Your 1099-K from Stripe reports gross sales. Your bank deposits reflect net payouts after Whatnot's commission, its payment-processing fee, refunds, and chargebacks. As of Whatnot's fee page on September 7, 2026, the commission on comics, trading cards, sports singles, and toys is 8% of the item's final sale price up to $1,500 (0% on the portion above $1,500 under a limited-time promotion), coins and money are 4%, and most other categories are 8%; the payment-processing fee is 2.9% of the total order value - item price plus buyer-paid shipping and buyer-paid tax - plus $0.30 per checkout. On $50,000 of card sales the commission alone is $4,000 and the processing fee runs above $1,450 because it is measured on shipping and tax as well, before the per-checkout $0.30 and any refunds or chargebacks. Reconcile actual statements: report gross receipts first, then deduct the fees your Seller Statement actually shows.

2. Failing to Track Cost Basis on Inventory

Potential issue: unsupported or omitted inventory basis and COGS

COGS depends on the seller's actual inventory purchases, basis allocations, beginning and ending inventory, returns, retained items, and accounting method; no industry percentage is reliable for a return. Preserve receipts and allocation support, distinguish inventory from personal or investment property, and reconcile inventory to sales.

3. Expensing Grading Fees on Cards Still in Inventory

Potential issue: a timing or expense-classification adjustment and any resulting tax, interest, or penalty consequences

PSA and BGS grading fees on cards that remain unsold at year-end are most defensibly carried in the card's basis rather than expensed currently, and whichever method you use must be applied consistently. An IRS examination can challenge a current-year deduction that is inconsistent with your inventory method. If the card sells the following year, the timing difference matters for tax purposes.

4. Ignoring the NJ Resale Certificate (Form ST-3)

Potential cost: 6.625% on every inventory purchase

If you buy inventory at NJ card shows or from NJ-based wholesalers without presenting a valid NJ Form ST-3 (Resale Certificate), you pay the full 6.625% NJ sales tax on purchases meant for resale. On $20,000 in annual inventory purchases, that is $1,325 in unnecessary sales tax. Form ST-3 is a free NJ Division of Taxation certificate, but you can issue it only after registering the business (Form NJ-REG through the Division of Revenue and Enterprise Services) and receiving a Certificate of Authority.

5. Missing Quarterly Estimated Tax Payments

Potential issue: underpayment charges based on actual installments and dates

W-2 withholding may not cover tax on separate business income. Apply the federal and NJ estimated-tax rules to projected net profit, other income, deductions, credits, withholding, income timing, and the applicable prior-year or current-year safe harbor. IRS underpayment interest changes quarterly; verify the rate and payment dates from current official guidance. Reserve the calculated shortfall in a separate account rather than relying on a fixed percentage of each sale.

6. Not Separating Personal Collection Sales from Business Inventory

Potential cost: Incorrect tax treatment, missed capital gains rates

If you sell a card from your personal collection that you have held for over a year, it may qualify for long-term capital gains treatment (generally capped at 28% under IRC Section 1(h)(5), reflecting the prevailing treatment of cards as collectibles) rather than ordinary income on Schedule C. Commingling personal collection sales with business inventory on a single Schedule C can result in paying higher self-employment tax on items that should receive capital gains treatment - or conversely, claiming business deductions against investment-type income.

7. Forgetting to Track Mileage to Card Shows and the Post Office

Potential issue: unsupported or omitted business mileage

Apply the official mileage rate in effect for each travel date only to substantiated business miles, after considering commuting, mixed-purpose travel, the vehicle method, and any restrictions from a prior method election. Keep a contemporaneous log with date, destination, purpose, and miles; the deduction and tax effect follow the supported facts.

8. Treating All Sales as Ordinary Income When Some Are Capital Gains

Potential cost: Unnecessary SE tax on investment-held items

An item held as an investment can differ from dealer inventory, but character depends on acquisition intent, holding purpose, sales activity, records, and all surrounding facts. Do not infer capital or ordinary treatment from holding period, platform, or sales volume alone, and keep separate basis and disposition records for personal, investment, and inventory property.

9. Ignoring the QBI Deduction

Potential cost: a fact-specific federal deduction left unclaimed

The Qualified Business Income deduction under IRC Section 199A can equal up to 20% of QBI. Collectible reselling generally is not an SSTB, but the taxable-income ceiling and W-2 wage/property limitations still apply. On $50,000 of Schedule C profit with no allocable health-insurance or retirement deduction, the preliminary amount is about $9,294 after subtracting half of SE tax; that is about $2,045 at a 22% marginal rate before other limits.

10. Not Deducting Whatnot and Stripe Processing Fees

Potential issue: omitted or duplicated platform charges

Whatnot's current seller charges vary by category, order amount, promotion, and fee component. Seller commissions and processing charges incurred in an existing resale business are generally current Section 162 expenses, subject to statement support, consistent gross-versus-net reporting, and the taxpayer's accounting method. Do not estimate or rely on a published example: download the Annual Seller Statement from Whatnot's Finances section (Seller Statements), reconcile it to gross receipts and refunds, and use the Schedule C line that accurately describes the charge.

NJ-Specific Tax Rules for Collectible Sellers

New Jersey adds its own layer of complexity for Whatnot sellers. Here is what NJ does differently from the federal system.

NJ Sales Tax on Collectibles: 6.625%

NJ imposes a 6.625% sales tax on tangible personal property unless a specific exemption applies, and cards are not exempt: sports cards, trading cards, comics, sneakers (see below), and other collectibles are taxable. Coins are the exception: since January 1, 2025, New Jersey exempts sales of investment metal bullion and qualifying investment coins (P.L. 2024, c.64, amending N.J.S.A. 54:32B-8.32); lower-value coins and all cards remain taxable. Notably, clothing is exempt from NJ sales tax under N.J.S.A. 54:32B-8.4 - and the exemption covers footwear for general use, so ordinary sneakers are exempt while sport or recreational equipment such as cleats is not.

For a covered New Jersey marketplace sale, Whatnot acts as the statutory marketplace facilitator and collects the tax: its help center lists New Jersey among the states where it collects and remits (read September 7, 2026), and P.L. 2018, c.132 (TB-83) has imposed that duty on facilitators since November 1, 2018. Confirm the platform's role and collection in the transaction records. Facilitator collection does not by itself eliminate the seller's registration, filing, direct-sale, product-taxability, exemption, or other duties.

At card shows, you are fully responsible. No marketplace facilitator exists at in-person events. NJ requires all vendors to register via Form NJ-REG at least 15 business days before the event, obtain a Certificate of Authority (Form CA-1), and collect the 6.625% sales tax on every taxable sale. There is no temporary vendor permit in NJ - full registration is required even for one-time events. NJ Division of Taxation personnel can make on-site jeopardy assessments at card shows.

The NJ Resale Certificate (Form ST-3) allows you to buy inventory for resale without paying the 6.625% sales tax at purchase. This covers sealed product, individual cards, and supplies purchased exclusively for resale. Present Form ST-3 to any NJ vendor or wholesaler when purchasing inventory. Retain certificates for 4 years. See my NJ sales tax guide for detailed coverage.

NJ Gross Income Tax

NJ taxes income under its category rules and provides no preferential long-term capital-gains rate. In the disposition category, same-year gains and losses net to a zero floor with no capital-loss carryover or cross-category ordinary-income offset. Federally, a supported net capital loss has an ordinary-income offset limited to the smaller of the loss or $3,000 ($1,500 if married filing separately), with unused character carried forward.

Three critical differences from federal treatment:

NJ does not allow the QBI deduction. The 20% deduction under IRC Section 199A is federal only. For the same business activity, NJ taxable income is usually higher than federal because neither the QBI deduction nor the half-SE-tax deduction exists on the NJ-1040.

NJ does not allow the 50% SE tax deduction. The IRC Section 164(f) deduction reduces federal AGI but does not carry to the NJ return.

NJ has no state-level self-employment tax. Schedule SE is federal; its regular Social Security and Medicare components are computed after the 92.35% adjustment and applicable wage-base rules. NJ separately taxes business net profits through the Gross Income Tax at rates up to 10.75%.

NJ estimated tax payments generally apply when expected tax due after withholding and credits is more than $400 - lower than the federal $1,000 boundary. Quarterly dates mirror federal (April 15, June 15, September 15, January 15). Current Form NJ-2210 generally computes underpayment interest from the smaller of 80% of current-year NJ tax or 100% of prior-year NJ tax, subject to payment timing and exceptions. N.J.S.A. 54A:9-6(d)(3) separately states a 110% high-income exception, but the Division says it imposes interest using the 100%-prior/80%-current computation.

NJ Worker Classification (ABC Test)

If you hire helpers for card shows, shipping, or stream production, NJ uses the ABC test - one of the strictest worker classification standards in the nation. All three prongs must be satisfied to classify a worker as an independent contractor. Prong B (service performed outside the usual course of the business, or outside all of its places of business) is particularly problematic: a helper assisting with card sales, shipping, or break preparation is performing work within the usual course of your business, likely triggering employee classification under Hargrove v. Sleepy's (220 N.J. 289, 2015).

Every Deduction You Can Claim as a Whatnot Seller

All expenses must be ordinary and necessary for the trade or business under IRC Section 162(a). Here is the complete list for Whatnot sellers:

Cost of Goods Sold (Schedule C Part III): All inventory purchased for resale - sealed product, individual cards, bulk lots, comics, sneakers. Inbound shipping costs to acquire inventory are includable in COGS.

Platform fees (Schedule C, Line 10): Whatnot commissions and payment-processing fees (see the current rates in Mistake #1), eBay Final Value Fees, Mercari selling fees, and all other marketplace commissions.

Shipping costs and materials (Schedule C, Line 22 or 27b): Boxes, bubble mailers, poly bags, tape, shipping labels, printer ink, postage, insurance on shipped packages.

Grading and authentication fees (Schedule C expense or capitalized to COGS): PSA, BGS, CGC, SGC submission fees. Expense in the year paid if the card is sold the same year; carry in basis (conservative, consistent method) if the card remains in inventory.

Card protection supplies (Schedule C, Line 22): Penny sleeves, toploaders, magnetic one-touch cases, Card Saver holders. If included with sold items, may be categorized as part of COGS or shipping materials.

Streaming equipment (IRC Sections 179 and 168): Cameras, ring lights, tripods, card display stands, microphones, and green screens require supported basis, class, placed-in-service date, and business-use allocation. Section 179 is elective and subject to eligibility, more-than-50% business use, the 2026 $2,560,000 dollar limit and $4,090,000 investment phaseout, taxable income, vehicle rules, and recapture. Qualified property may receive separate Section 168(k) bonus treatment under its acquisition, transition, election, and other requirements.

Card show expenses (Schedule C, various lines): Ordinary booth and table fees are generally current business expenses when substantiated. Vehicle deductions require a valid business-mile log and a permitted method; lodging requires qualifying travel away from the taxpayer's tax home; and business meals are generally limited to 50% under Section 274 with the required business connection and substantiation.

Home office (IRC Section 280A): A dedicated shipping, inventory storage, or streaming room qualifies. Simplified method: $5/sq ft up to 300 sq ft ($1,500 max). Regular method (Form 8829): actual percentage of home expenses including rent or mortgage interest, property taxes, insurance, utilities, and depreciation.

Internet and phone (Schedule C, Line 25): Business-use percentage of monthly bills for streaming, listings, market research, and customer communication.

Subscriptions and software (Schedule C, Line 18 or 27b): Beckett Online, PSA memberships, eBay Store subscriptions, PirateShip, ShipStation, QuickBooks, inventory management tools, and any card pricing databases.

Insurance (Schedule C, Line 15): Business insurance covering inventory, shipping errors, and liability. Self-employed health insurance premiums are deductible above the line under IRC Section 162(l).

Professional fees (Schedule C, Line 17): CPA and tax preparation fees, legal fees for business operations. LLC formation costs may require amortization under IRC Section 195 ($5,000 immediate, remainder over 180 months) if incurred before business operations begin.

Vehicle expenses (Schedule C, Line 9 or 44a): Standard mileage method (72.5 cents/mile Jan-Jun 2026; 76 cents/mile Jul-Dec 2026) or actual expense method for trips to card shows, post office, supply stores, and inventory sourcing. Keep a contemporaneous mileage log.

Advertising and marketing (Schedule C, Line 8): Paid promotions, social media advertising, and any costs to grow your Whatnot following. For small business tax planning strategies that maximize these deductions, see the entity structure section below.

Entity Structure: Sole Prop to LLC to S-Corp

Sole Proprietorship (Default)

A sole proprietorship is the default federal classification when an individual carries on the business without another entity election. You report income on Schedule C (Form 1040), and no separate entity return is required. Entity choice depends on liability exposure and a full tax model, not a fixed profit band. An EIN from the IRS (free via Form SS-4 online) can keep your SSN off business W-9 forms.

Single-Member LLC

An LLC adds liability protection without changing your tax situation - it remains a disregarded entity filing Schedule C under Treas. Reg. Section 301.7701-3(b)(1)(ii). In NJ, formation costs $100 (reduced from $125 effective July 1, 2026 under P.L. 2026, c.24) plus $75/year for the annual report. No publication requirement (unlike New York).

LLC formation is a state-law and liability decision for an attorney or formation provider, not a revenue trigger. Monaco CPA does not form entities, obtain EINs, register DBAs, provide registered-agent services, open bank accounts, or give legal advice. The NJ LLC guide is general education; after an entity exists, Monaco CPA can analyze its federal and NJ tax classification under a separately accepted written scope.

S-Corp Election

An S-Corporation election (IRC Section 1362, Form 2553) splits income into W-2 salary (subject to FICA) and K-1 distributions (not subject to FICA). The S-Corp's tax advantage comes from this FICA avoidance on the distribution portion.

When it may make sense: Only after a full-return comparison. Model a defensible reasonable salary, both halves of payroll tax, the owner's other wages, QBI, retirement contributions, employer deductions, unemployment taxes, NJ taxes and BAIT if applicable, payroll and Form 1120-S costs, NJ minimum Corporation Business Tax, and administrative burden. No single profit range guarantees net savings. Use the S-Corp calculator to model your specific inputs.

The reasonable compensation requirement (IRS Fact Sheet 2008-25) prevents owners from paying unreasonably low salaries. In David E. Watson, P.C. v. United States (668 F.3d 1008, 8th Cir. 2012), Watson reported $24,000 of annual wages and the district court accepted expert evidence of $91,044 in annual remuneration. The case illustrates wage reclassification on its facts, not a salary formula; support compensation with current comparable-pay evidence for the services actually performed.

NJ S-Corp recognition: The statute applies to privilege periods beginning after December 22, 2022; for calendar-year taxpayers, that means January 1, 2023. NJ procedural FAQ/TB-105 also describe the rule as on or after December 22, 2022; unusual short periods beginning Dec. 22 need Division confirmation. For qualifying periods, P.L. 2022, c.133 recognizes a valid federal S election unless the entity opts out; DORES registration, federal approval proof, Shareholder Jurisdictional Consent, timely CBT-100S filing, and earlier-period relief remain separate matters.

The QBI interaction can favor or disfavor an S-Corp depending on the full return. Section 199A is permanent, and collectible reselling generally is not an SSTB. At higher income, W-2 wages may support the wage limitation, while reasonable compensation is excluded from QBI and the K-1 business-income base remains subject to the taxable-income ceiling and other limits.

NJ BAIT election: The Business Alternative Income Tax allows pass-through entities (including S-Corps) to pay NJ income tax at the entity level, making it deductible on the federal return and bypassing the individual SALT cap (now $40,000 for 2025 and $40,400 for 2026 under OBBBA). BAIT rates start at 5.675% on the first $250,000. Disregarded single-member LLCs are ineligible; an LLC classified as a qualifying S corporation follows that classification, and the entity and member eligibility rules still apply.

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Whatnot seller taxes involve 1099-K reconciliation, COGS tracking for collectibles, grading-fee capitalization, and NJ sales-tax rules. I'm Greg Monaco, a NJ-licensed CPA. Greg is the sole practitioner and personally reviews, approves, and signs all client-facing work.

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Disclaimer: This post provides general tax information and is not a substitute for personalized tax advice. Consult a qualified tax professional for advice specific to your situation.

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Disclaimer: This content is for informational purposes only and does not constitute tax advice. Written tax advice from a Circular 230 practitioner is governed by 31 C.F.R. §10.37; Treasury’s 2014 final regulations eliminated the former “covered opinion” rules and their mandatory disclaimer legend, so no such legend appears here. Tax laws change frequently; consult a licensed CPA about your specific facts.