Whatnot Seller Taxes: The Complete CPA Guide for Collectible Resellers

Every dollar you earn selling on Whatnot is taxable income, whether you receive a 1099-K or not. Whatnot processes payments through Stripe, and Stripe will issue a 1099-K reporting your gross sales — including shipping charges — before deducting commissions, processing fees, or refunds. If your 1099-K shows $47,000 but you only deposited $38,000, that $9,000 gap is not missing money — it is platform fees, shipping, and refunds that you deduct on Schedule C. Getting this reconciliation wrong is the single most common mistake I see from Whatnot sellers, and it is the fastest way to overpay your taxes or trigger an IRS CP2000 notice.

I work with collectible resellers at every level — someone flipping $200 in Pokémon cards on a weekend stream to six-figure sports card operations running simultaneous Whatnot, eBay, and Mercari shops. The 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 is built on the research I use in my own practice. Every IRC citation, every fee number, and every NJ-specific rule is current as of March 2026. If something changes, I update the guide. For resellers who also sell on Poshmark, eBay, Depop, and similar platforms, my complete reseller tax guide covers those platforms in detail.

In this guide:

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 eBay's static listings or Mercari's simple buy-it-now format, 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.

The fee structure is straightforward but impacts your tax math. Whatnot charges an 8% commission on the final sale price (reduced to 4% on coins and money, 5% on electronics), plus a 2.9% + $0.30 payment processing fee on the total order value including item price, shipping, and buyer-paid tax. There are no listing fees and no monthly subscription costs. Seller earnings become available within 4 hours of confirmed delivery, with an Early Payout program for qualifying sellers.

Whatnot operates as a marketplace facilitator in all U.S. states and territories with marketplace facilitator laws — effectively every state with a sales tax. This means Whatnot collects and remits sales tax on your behalf. You do not separately collect or remit sales tax on Whatnot transactions. However, in certain states, Whatnot charges sales tax on its own fees to sellers: commission fees are taxed in DC, Hawaii, New Mexico, and West Virginia, and processing fees are taxed in Connecticut, Hawaii, New Mexico, Ohio, South Dakota, Texas, and West Virginia.

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

Whatnot issues Form 1099-K via Stripe by January 31 for sellers meeting the federal reporting threshold. Under the One Big Beautiful Bill Act (OBBBA, Public Law 119-21, Section 70432), signed July 4, 2025, the federal threshold was permanently restored to $20,000 in gross payments AND more than 200 transactions per platform. The ARPA $600 threshold was repealed retroactively as if it never existed.

What the 1099-K includes: Gross transaction amounts including shipping charges collected from buyers, before deducting commissions, processing fees, refunds, or chargebacks. Sales tax collected and remitted by Whatnot as marketplace facilitator is generally excluded from the gross amount.

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 Statements in the Financials section. If you used both Stripe and PayPal for cashouts, you may receive separate 1099-Ks from each processor.

State thresholds are lower than federal. New Jersey requires 1099-K issuance at $1,000 with no transaction minimum. Several other states maintain sub-federal thresholds: Vermont, Massachusetts, Maryland, and Virginia at $600; Illinois at $1,000 with 4+ transactions; Arkansas at $2,500. A NJ-based Whatnot seller earning $5,000 will receive a state-triggered 1099-K from Stripe even though the federal threshold was not met.

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 critical trap: If you report only bank deposits (the net amount after Whatnot's 8% commission and 2.9% processing fee) instead of the 1099-K gross, the IRS Automated Underreporter system flags the discrepancy and generates a CP2000 Notice — a proposed adjustment adding tax on the "missing" income plus interest and potential accuracy-related penalties under IRC Section 6662. Over 4 million CP2000 notices are sent annually. Always start with gross, then deduct.

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) (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 entire box cost is COGS aggregated against total spot revenue for that break. No allocation among individual spots is required. If you sold 30 spots totaling $750, 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. This applies to cost basis, not just deductions. 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). Report it on Schedule C as a business expense.

If the graded card remains in inventory at year-end, the grading fee should be capitalized to the card's basis — added to your cost of the card. This is the more conservative and technically correct treatment under IRC Section 263A for costs that directly benefit the property. When you eventually sell the card, the capitalized grading fee becomes part of your COGS, reducing your taxable gain.

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 $30 grading fee should be capitalized to the card's $80 basis, not expensed currently. Most small-business card sellers are exempt from the strict UNICAP rules, but capitalizing grading fees to inventory is still the sound approach.

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

This classification is the single most consequential determination for collectible sellers. Under hobby classification, income is reported on Schedule 1, Line 8z as "Other Income" — and no expenses can be deducted at all. The Tax Cuts and Jobs Act suspended miscellaneous itemized deductions (the only category that historically allowed hobby expense deductions) through 2025, and the OBBBA permanently eliminated them. The hobby loss trap is now permanent, not temporary.

The devastating impact: a seller with $40,000 in gross sales and $35,000 in expenses classified as a hobbyist pays income tax on the full $40,000 with zero offset. Business classification allows all $35,000 in expenses on Schedule C, taxing only the $5,000 net profit. At a combined 30%+ rate, that difference is over $10,000 in unnecessary taxes.

Under business classification, all ordinary and necessary expenses are deductible on Schedule C under IRC Section 162. Net profit is subject to both income tax and 15.3% self-employment tax (IRC Section 1401), with a 50% above-the-line deduction for the employer-equivalent portion under IRC Section 164(f). Business treatment is almost always better for active Whatnot sellers.

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. In Akey v. Commissioner (T.C. Memo 2014-211) — a sports memorabilia case — the Tax Court found that knowledge of card grading alone was insufficient; the focus must be on economic and business 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 demonstrates significant commitment. A seller streaming 3-4 nights per week is clearly devoting substantial 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. But Akey noted that failing to insure a collection undermines this claim.

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 card market downturns (like the 2023 sports card correction) 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 raises IRS suspicion that the activity is a tax shelter rather than a genuine business.

9. Elements of personal pleasure (Section 1.183-2(b)(9)): This is the most dangerous factor for collectors. As the Tax Court stated in Weller v. Commissioner (T.C. Memo 2011-224): "Suffering has never been a prerequisite to deductibility." Enjoyment alone does not disqualify an activity — but it is the factor the IRS leans on hardest when challenging card sellers.

The 3-Out-of-5-Year Safe Harbor

If gross income exceeds deductions in 3 of the last 5 consecutive years (IRC Section 183(d)), a rebuttable presumption of profit motive shifts the burden of proof to the IRS. Whatnot sellers with consistent positive cash flow should document this carefully. Form 5213 allows taxpayers to postpone the determination but extends the statute of limitations — I rarely recommend filing it.

Income Scenarios at Five Revenue Levels

All calculations use confirmed 2026 parameters: standard deduction of $15,750 single / $31,500 MFJ, Social Security wage base of $184,500, and post-OBBBA brackets. Self-employment tax is 15.3% on 92.35% of net earnings under IRC Section 1401 and Section 1402(a)(12). The QBI deduction under IRC Section 199A (20% of qualified business income) is now permanent under the OBBBA. Collectible reselling is not a Specified Service Trade or Business, so QBI is available at all income levels.

Side hustle scenario assumes $75,000 W-2 income; federal income tax shown is the additional tax attributable to the Whatnot income only. At the part-time level and above, the seller's primary income is from card selling. Effective rate includes both SE tax and federal income tax on the Whatnot net profit. Use my [SE tax calculator](/tools/se-tax-calculator) to model your specific numbers.

Key takeaway from this table: The combined federal burden on Whatnot income ranges from approximately 14% for small side hustles to nearly 28% for six-figure operations — and that is before NJ state tax adds another 5-7%. Every dollar of COGS and legitimate deductions you can document directly reduces this burden. At the enterprise level, an S-Corp election can save $8,000-$15,000+ annually in FICA taxes. Use my S-Corp calculator to model the break-even point.

Common Mistakes That Cost Whatnot Sellers Thousands

These are the errors I see most frequently when reviewing returns from Whatnot sellers. Every one of them is avoidable.

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

Your 1099-K from Stripe reports gross sales. Your bank deposits reflect net payouts after Whatnot's 8% commission, 2.9% + $0.30 processing fee, refunds, and chargebacks. On $50,000 in gross sales, the gap between gross and net can exceed $6,000. If you report only $44,000 on Schedule C but Stripe reported $50,000 to the IRS, the Automated Underreporter system will flag the mismatch. Always report gross first, then deduct fees as expenses.

2. Failing to Track Cost Basis on Inventory

COGS is typically 40-55% of gross sales for collectible resellers. A seller with $50,000 in gross sales and $25,000 in inventory costs who fails to track and claim COGS pays taxes on $25,000 of phantom income. At a 30% combined rate, that is $7,500 in unnecessary taxes. Photograph every receipt, log every card show purchase, and reconcile inventory quarterly.

3. Expensing Grading Fees on Cards Still in Inventory

PSA and BGS grading fees on cards that remain unsold at year-end should be capitalized to the card's basis, not expensed in the current year. The IRS can reclassify these as improper current-year deductions during an audit. If the card sells the following year, the timing difference matters for tax purposes.

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

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. The resale certificate is free and available through the NJ Division of Revenue.

5. Missing Quarterly Estimated Tax Payments

Whatnot sellers with W-2 day jobs are especially vulnerable — their withholding does not account for self-employment income. If you expect to owe more than $1,000 federally or $400 in NJ after withholding and credits, quarterly payments are required. The current IRS underpayment interest rate is 7% per year, compounded daily. Set aside 25-30% of net profit from each sale into a separate tax reserve account.

6. Not Separating Personal Collection Sales from Business Inventory

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 (capped at 28% for collectibles under IRC Section 1(h)(5)) 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

The standard mileage rate is 72.5 cents per mile for 2026 (IRS Notice 2025-58). A seller driving 50 miles round-trip to a weekly card show (52 trips) plus 20 miles round-trip to the post office twice a week (104 trips) logs approximately 4,680 business miles — a $3,393 deduction. At a 30% combined rate, that saves roughly $1,018. Keep a mileage log with date, destination, purpose, and miles.

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

If you purchased a graded vintage card three years ago as a personal investment (not inventory for your business) and sell it on Whatnot for a profit, that gain is a long-term collectible capital gain — not ordinary business income. Capital gains are not subject to the 15.3% self-employment tax. The distinction between dealer inventory (ordinary income) and investment property (capital gains) depends on your intent at the time of purchase and your pattern of activity. Regular Whatnot streamers with high-volume sales are almost certainly dealers for most items — but that does not mean every item in your possession is inventory.

9. Ignoring the QBI Deduction

The Qualified Business Income deduction under IRC Section 199A allows a 20% deduction on qualified business income. Collectible reselling is not a Specified Service Trade or Business, so the deduction is available at all income levels (subject to W-2 wage and property limitations above the threshold). On $50,000 net profit, the QBI deduction saves approximately $2,000-$3,000 in federal taxes depending on your bracket. Many self-prepared returns miss this deduction entirely.

10. Not Deducting Whatnot and Stripe Processing Fees

Whatnot's 8% commission plus Stripe's 2.9% + $0.30 processing fee add up to approximately 11% of gross sales. On $50,000 in gross sales, that is roughly $5,500 in fully deductible platform fees under IRC Section 162(a). Report these on Schedule C, Line 10 (Commissions and fees). Download your Annual Seller Statement from Whatnot's Financials section for exact figures.

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 all tangible personal property, including sports cards, trading cards, comics, sneakers, coins, and other collectibles. There is no exemption for collectibles in NJ. Notably, clothing is exempt from NJ sales tax under N.J.S.A. 54:32B-8.4 — so sneaker sellers pay sales tax on sneakers classified as athletic equipment but not on most apparel items.

On Whatnot, this is handled for you. As a marketplace facilitator, Whatnot collects and remits NJ sales tax on all applicable transactions. You do not need to separately collect or remit sales tax on Whatnot sales.

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 all tangible personal property sales. 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 all income — including self-employment income from Whatnot sales — at ordinary rates ranging from 1.4% to 10.75%. There is no preferential capital gains rate at the state level, meaning both short-term and long-term collectible gains are taxed identically by NJ. NJ also does not allow capital loss carryovers and does not permit the $3,000 offset of capital losses against ordinary income.

Three critical differences from federal treatment:

NJ does not allow the QBI deduction. The 20% deduction under IRC Section 199A is federal only. Your NJ taxable income will always be higher than your federal taxable income for the same business activity.

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. The 15.3% SE burden is exclusively federal. NJ taxes business net profits through the Gross Income Tax at rates up to 10.75%.

NJ estimated tax payments are required when estimated liability exceeds $400 — lower than the federal $1,000 threshold. Quarterly dates mirror federal (April 15, June 15, September 15, January 15). The safe harbor requires payment of at least 80% of current year liability or 100% of prior year liability (110% if gross income exceeds $150,000). NJ's extension trap is severe: if you file Form NJ-630 but pay less than 80% by April 15, NJ retroactively denies the extension and assesses both late-filing penalties (5% per month, up to 25%) and late-payment penalties.

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 employer's usual course 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 (8%), processing fees (2.9% + $0.30), eBay Final Value Fees, Mercari selling fees, and all other marketplace commissions.

Shipping costs and materials (Schedule C, Line 22 or 27a): 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; capitalize 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 Section 179 or Section 168): Cameras, ring lights, tripods, card display stands, microphones, green screens. Section 179 allows immediate expensing up to $2.5 million (increased by OBBBA). 100% bonus depreciation was permanently restored by OBBBA for property placed in service after January 19, 2025.

Card show expenses (Schedule C, various lines): Booth and table fees (fully deductible), travel mileage (72.5 cents/mile for 2026), hotel for overnight business travel, and meals with clients or dealers (50% deductible under IRC Section 274(k) with proper 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 27a): 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) 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, I work with resellers at every level.

Entity Structure: Sole Prop to LLC to S-Corp

Sole Proprietorship (Default)

Every Whatnot seller starts here. You report income on Schedule C (Form 1040). No separate entity filing is required. This is perfectly fine for sellers earning under $30,000-$40,000 in net profit. Get an EIN from the IRS (free via Form SS-4 online) even as a sole proprietor to protect your SSN on 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 $125 plus $75/year for the annual report. No publication requirement (unlike New York).

Form an LLC when: you carry meaningful inventory that creates chargeback or dispute exposure, you sell at card shows with in-person liability risk, or your revenue is consistent enough that the $75 annual cost is trivial. For NJ-specific formation guidance, see my NJ LLC formation guide.

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 makes sense: Generally at $60,000-$80,000+ in net profit, where SE tax savings exceed additional compliance costs. At $100,000 net profit with a $50,000 reasonable salary, estimated annual savings are approximately $3,000-$4,000 after compliance costs (payroll service at $500-$2,000/year, Form 1120-S preparation at $1,000-$3,000, and NJ minimum Corporation Business Tax at ~$375-$500). Use my S-Corp calculator to model your specific numbers.

The reasonable compensation requirement (IRS Fact Sheet 2008-25) prevents owners from paying unreasonably low salaries. Watson v. Commissioner (668 F.3d 1008, 8th Cir. 2012) successfully challenged a $24,000 salary on $200,000+ in income. Set your salary based on what a comparable card business manager would earn.

NJ S-Corp recognition: For NJ entities formed after December 22, 2022, the federal S-Corp election is automatically recognized by New Jersey — no separate NJ filing required (P.L. 2022, c. 133). Entities formed before that date should file Form CBT-2553-R (Retroactive S-Corp Election) through the NJ DORES portal.

The QBI advantage compounds with S-Corp status. The IRC Section 199A deduction (20% of qualified business income) is now permanent under OBBBA. Collectible reselling is not an SSTB, so the deduction is available at all income levels. At higher income, the S-Corp's W-2 salary creates a wages limitation that actually supports the QBI deduction, while the K-1 distribution provides the qualified business income base.

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 under OBBBA). BAIT rates start at 5.675% on the first $250,000. Single-member LLCs are ineligible — only S-Corps and partnerships qualify.

Frequently Asked Questions