Accounting & Tax for Amazon FBA Sellers

CPA Services for Amazon FBA Sellers

Service boundary: accepted Amazon FBA work is defined in writing and may include income-tax preparation, bookkeeping, and NJ sales-tax registration and filing. Monaco CPA does not provide other-state sales-tax nexus monitoring, registration, filing, or voluntary-disclosure representation. Customs, tariff, foreign R&E, and other international-tax material below is general education only and requires qualified customs and international-tax specialists.

Amazon FBA sellers face tax complexity that rivals businesses ten times their size. The moment you ship inventory to Amazon, their algorithm redistributes your products across 175+ fulfillment centers nationwide. You now have physical nexus in dozens of states you have never visited, creating sales tax registration obligations, potential income tax filing requirements, and compliance exposure that requires specialized knowledge of FBA operations.

The single most expensive bookkeeping mistake FBA sellers make is recording net Amazon deposits as revenue. Amazon reports gross sales on your 1099-K, which includes the item price, shipping charges, and sales tax collected. It does not subtract referral fees (typically 15% of sale price), FBA fulfillment fees, storage fees, return processing fees, or the sales tax Amazon remitted on your behalf. A seller with $250,000 in gross sales might only see $165,000 in net bank deposits, but the IRS receives a 1099-K showing $250,000. If you report $165,000 on Schedule C Line 1, you will receive a CP2000 notice 12 to 18 months later showing $85,000 in unreported income. The fix is straightforward but requires proper accounting: report gross revenue on Line 1 to match the 1099-K, then deduct every Amazon fee on the appropriate expense lines. This reconciliation system should be set up from day one.

Cost of Goods Sold is typically the largest expense line for any physical product business, and most sellers calculate it wrong. True COGS for an FBA seller is not just the unit price you paid your manufacturer. It is the full landed cost: product cost plus ocean freight, customs duties, customs brokerage fees, cargo insurance, domestic drayage from port to Amazon, inbound placement fees, and prep and labeling costs.

Amazon settlement reports are generated every two weeks. Some default Seller Central views only surface the most recent 90 days, but date-range and settlement reports remain retrievable after that window; downloading and archiving each settlement on a regular schedule is still the best practice so your bookkeeping never depends on re-pulling old reports. Each settlement contains gross product sales, shipping credits, promotional rebates, refunds, referral fees, FBA fulfillment fees, storage fees, subscription fees ($39.99/month for Professional accounts), reimbursements for lost or damaged inventory, and other adjustments. The correct bookkeeping approach uses a clearing account model: post each settlement as a categorized journal entry to an Amazon Clearing account, then match the ACH deposit when it hits the bank. Integration tools like A2X ($29 to $229/month depending on volume) or Link My Books ($21 to $249/month) automate this breakdown and post properly categorized entries to QuickBooks Online that match your bank deposit to the penny.

All 45 states with a sales tax plus Washington D.C. have enacted marketplace facilitator laws, which means Amazon calculates, collects, and remits sales tax on marketplace transactions. Many sellers assume this means they are done with sales tax. They are wrong. Marketplace facilitator laws only cover sales made through the marketplace. If you also sell through Shopify, your own website, wholesale channels, or trade shows, you must independently register, collect, and remit sales tax in every state where you have nexus. Even marketplace-only sellers are required to register and file zero-dollar returns in states like Washington, Pennsylvania, and Connecticut once nexus is triggered. Failure to file even a zero-dollar return while holding an active permit triggers penalties in virtually every state. The dominant economic nexus threshold is $100,000 in sales, with California and Texas at $500,000, and New York at $500,000 AND 100 transactions (both prongs). NJ uses $100,000 OR 200 transactions.

Multi-state income tax is the compliance burden most sellers overlook entirely. Owning inventory stored in a state creates income tax nexus because it exceeds the protections of Public Law 86-272. California is the most aggressive enforcer. In the Appeal of Diet Standards LLC, 2025-OTA-646 (Oct. 7, 2025), the Office of Tax Appeals held that an out-of-state seller with FBA inventory in California warehouses and California sales was 'doing business' under R&TC Section 23101(a) even though both were minimal - roughly $14,000 of sales and $2,333 of peak inventory. Applying its precedential decision in the Appeal of GEF Operating, Inc. (2020-OTA-057P), the OTA reiterated that California's bright-line factor presence thresholds ($75,707 in property, $757,070 in sales) are not a safe harbor. The decision is nonprecedential but tracks the FTB's enforcement posture: an FBA seller with California inventory and sales owes the $800 annual LLC tax (corporations owe the parallel minimum franchise tax) plus potential penalties for each unfiled year. Sellers should evaluate their multi-state income tax exposure and prioritize compliance in the highest-risk states: California, New York, and any state with significant sales volume.

An S-Corp election can change the payroll-tax result for a profitable Amazon seller, but the comparison is fact-specific. For an ordinary nonfarm sole proprietor, Schedule C profit generally enters Schedule SE at 92.35%; regular SE tax applies when line 4c is $400 or more, with Social Security limited by the remaining wage base and Medicare generally uncapped. At $100,000 of Schedule C profit, the preliminary SE tax is approximately $14,130. A hypothetical $45,000 W-2 salary carries about $6,885 of combined employer/employee FICA, a $7,245 gross payroll-tax difference - not annual net savings. Recompute the employer payroll deduction, half-SE-tax deduction, QBI, income tax, NJ payroll and CBT costs, and actual compliance costs before deciding. P.L. 2022, c.133 generally eliminated the old separate CBT-2553 for qualifying federal approval/effective dates and privilege periods, but DORES 1120-filer registration, federal approval proof, Shareholder Jurisdictional Consent, and timely CBT-100S filing still apply. Formation date is not the test; earlier periods may require retroactive-election review.

Reasonable compensation for seasonal FBA businesses presents a unique challenge. The IRS evaluates what it would cost to hire someone to perform the owner's duties: supply chain sourcing, listing optimization, PPC management, inventory planning, and financial oversight. An e-commerce operations manager salary of $35,000 to $65,000 provides a defensible benchmark. For a seller netting $100,000 with revenue concentrated in Q4, a salary of $35,000 to $50,000 is typically defensible. If cash flow is tight during a capital-intensive product launch, you can temporarily forego compensation, but you must catch up in a later quarter. There is no IRS-published 50/50 safe harbor or trigger rule - reasonable compensation is a facts-and-circumstances determination based on the value of the services performed (Treas. Reg. §1.162-7). Cases like David E. Watson, P.C. v. United States (668 F.3d 1008, 8th Cir. 2012) show the IRS successfully recharacterizing distributions as wages when salary is unreasonably low, so an arbitrary split with no supporting analysis is a risk not worth taking.

Inventory valuation method matters and must be applied consistently. FIFO (First-In, First-Out) is the most commonly recommended method because it aligns with how Amazon typically fulfills orders and provides accurate balance sheet valuation with ending inventory at newer costs. Weighted average cost is a practical alternative when price differences between batches are small. Once adopted, changing methods requires IRS approval via Form 3115. Under the lower-of-cost-or-market method, slow-moving or obsolete FBA inventory can be written down. Amazon reimbursements for lost or damaged inventory should be recorded as Other Income, not sales revenue. As of March 31, 2025, Amazon reimburses based on manufacturing cost rather than selling price, significantly reducing recovery amounts. Claim windows are tight: 60 days for fulfillment center issues, 60 to 120 days for return discrepancies.

The OBBBA (One Big Beautiful Bill Act, signed July 4, 2025) introduced several changes directly affecting FBA sellers. The 1099-K threshold was permanently restored to more than $20,000 in gross payments AND more than 200 transactions, killing the planned $600 threshold. New IRC Section 174A (added by OBBBA Section 70302(a)) permanently establishes full expensing for domestic R&E expenditures, but foreign R&E (such as paying Chinese manufacturers for mold development or product engineering) remains under Section 174 and must still be amortized over 15 years. Small businesses under $31 million in receipts could retroactively elect expensing for 2022 to 2024 by amending returns, but that general small-business election window closed in early July 2026 (and an earlier IRC Section 6511 refund-claim deadline could have applied to a given year). The 1099-NEC threshold increased from $600 to $2,000 for payments made after December 31, 2025. Section 321 de minimis ($800 duty-free threshold) was eliminated for Chinese goods in May 2025, suspended globally in August 2025, and permanently repealed effective July 1, 2027. 100% bonus depreciation is now permanent for qualifying property acquired after January 19, 2025.

NJ-based FBA sellers use the state's single sales factor and destination sourcing for sales of tangible personal property. For eligible pass-through entities, BAIT is computed on the New Jersey distributive-proceeds base using the current three-bracket schedule (N.J.S.A. 54A:12-3, as amended by P.L. 2021, c.419 effective Jan 1, 2022): 5.675% on the first $250,000, 6.52% on $250,001 to $1,000,000, and 10.9% above $1,000,000. (The pre-2022 9.12% bracket on $1M-$5M income was collapsed into the 10.9% bracket.) The entity payment can create a federal business deduction and owners receive the corresponding NJ credit, but SALT usage, QBI, allocation, resident credits, and the full return determine the benefit. Sole proprietors and disregarded single-member LLCs are not eligible; that eligibility difference alone does not establish that an S-Corp election is advantageous. NJ LLC formation costs $100 plus $75/year for the annual report.

Voluntary Disclosure Agreements may be available to sellers who have been selling for years without registering in nexus states. Most states waive 100% of penalties and limit the look-back period to 3 to 4 years under a VDA, compared to unlimited exposure if the state initiates the audit first. VDAs can be initiated anonymously through a representative. The Multistate Tax Commission offers consolidated multi-state applications for sellers needing to disclose in multiple states simultaneously. If you have been selling through FBA for more than a year without registering in states where Amazon stores your inventory, the exposure is real and growing. States may use marketplace data to identify non-compliant sellers. Monaco CPA does not provide VDA or other-state disclosure representation; consult a qualified multistate tax-controversy professional.

Amazon Lending offers term loans and lines of credit to qualifying sellers. The tax treatment depends on the product type. For term loans, the principal is not income and principal repayment is not deductible. The interest portion of each payment is deductible under IRC Section 163(a). Amazon typically provides an amortization schedule in Seller Central showing the interest-to-principal split. For Amazon's merchant cash advances (MCAs), which are technically purchases of future receivables rather than loans, the total repayment fee (amount repaid minus amount advanced) is deductible as a business expense in the year paid. Amazon automatically deducts loan or MCA payments from your settlement proceeds, so your net deposits are reduced. Track these deductions separately in your bookkeeping system to ensure you claim the full interest or fee deduction.

Returns, refunds, and A-to-Z Guarantee claims create specific accounting requirements. Customer refunds should be reported on Schedule C, Line 2 (Returns and Allowances), reducing gross receipts to match economic reality. When Amazon processes a refund, they reverse the customer charge but do not always return your referral fee - you may need to file for a referral fee credit through Seller Central under Reimbursement reports. A-to-Z Guarantee claims that Amazon approves against your account are treated identically to refunds: the debit appears on your settlement report, and you record it as a return or allowance. For returned inventory that is unsellable (customer-damaged or defective), the cost of that inventory is a deductible loss. If Amazon destroys or disposes of unfulfillable inventory, request a removal order confirmation and record the loss. Track the FBA Customer Returns Report and the Returns Reimbursement Report in Seller Central to reconcile all return-related transactions.

The step-by-step 1099-K reconciliation process uses five Seller Central reports. First, download the Date Range Summary Report (Reports > Payments > Date Range Reports) for the full calendar year. This shows gross product sales, shipping credits, promotional rebates, Amazon fees, and other activity. Second, download the 1099-K Detailed Transactions Report from your Tax Document Library (Reports > Tax Document Library). Third, pull the Settlement Reports for each two-week period (Reports > Payments > Settlements). Fourth, export the All Orders Report (Reports > Fulfillment > All Orders) filtered by calendar year to capture December orders with January deposits. Fifth, pull the Returns Report (Reports > Fulfillment > Customer Returns) for return and refund reconciliation. Compare the 1099-K Box 1a total against the Date Range Summary gross product sales plus shipping credits plus gift wrap credits plus sales tax collected. The difference should be explained by timing (orders placed December 28-31 with deposits clearing in January) and excluded transaction types. Document every variance in a reconciliation worksheet for audit defense.

This guide covers 1099-K reconciliation, COGS records, entity-tax classification, and educational nexus screening. Monaco CPA may provide NJ sales-tax registration and filing under a written scope; other-state sales-tax operational compliance is not provided.