Accounting & Tax for Amazon FBA Sellers

Tax & Accounting Context 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 may redistribute FBA inventory among fulfillment centers, so sellers should use Amazon inventory-location reports rather than assume a fixed number of affected states. For each jurisdiction in which inventory, people, direct sales, or other activity appears, separately test product taxability, sourcing, marketplace-facilitator coverage, physical and economic nexus, registration and return relief, and income or franchise-tax rules under current primary authority. Inventory location or revenue alone does not establish identical duties everywhere.

Reconcile the actual Form 1099-K, if furnished, to the seller's orders, settlement ledger, refunds, fees, taxes, and deposits. Form 1099-K reports gross payment amounts under its rules and does not establish taxable profit or the return line for every adjustment. Report gross receipts and substantiated expenses under the taxpayer's actual business, accounting-method, and return facts; do not infer the form content from the Amazon label or report only net bank deposits.

Cost of goods sold depends on the taxpayer's inventory and accounting method. Supported landed cost can include product cost, freight, customs duties, brokerage, cargo insurance, drayage, inbound placement, prep, and labeling when the applicable capitalization and timing rules require it; the Amazon label alone does not classify an amount.

Seller Central report names, availability windows, settlement cadence, fields, and navigation can change. Export the reports and account statements actually available for the period, retain them with the books, and reconcile the gross activity, fees, refunds, reimbursements, taxes, and deposits. A clearing-account workflow or integration tool may assist, but its categories and completeness still require review against source records.

Amazon generally calculates, collects, and remits sales tax on covered marketplace transactions under applicable marketplace-facilitator rules. That does not answer the treatment of a seller's Shopify, website, wholesale, trade-show, or other direct transactions. Registration, return filing, and marketplace-only relief vary by jurisdiction, and an active permit can carry filing duties until it is properly closed even when no tax is due. Determine each obligation from current state revenue-department guidance using the seller's product, sourcing, channel, marketplace exclusions, physical presence, sales measurement period, and threshold facts; no national threshold or fixed state count controls.

FBA inventory can be relevant to a state's income, franchise, gross-receipts, or entity-level tax, but nexus, tax type, entity classification, and any Public Law 86-272 protection require separate state-by-state analysis. Inventory should not be described as automatically defeating Public Law 86-272 or producing the same filing duty in every state. In Appeal of Diet Standards LLC, 2025-OTA-646 (Oct. 7, 2025), California's Office of Tax Appeals held on that seller's facts that California FBA inventory and sales constituted 'doing business,' applying its precedential GEF Operating decision; Diet Standards itself is nonprecedential. Sellers with California activity should review current FTB authority and their own inventory, sales, entity, and filing facts rather than treat that decision as a universal result.

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. The statute applies to privilege periods beginning after December 22, 2022; for calendar-year taxpayers, that means January 1, 2023. NJ procedural FAQ and TB-105 also describe the rule as on or after December 22, 2022; an unusual short period beginning December 22 needs Division confirmation. For a covered period, P.L. 2022, c.133 automatically recognizes a valid federal S election unless the entity opts out; the separate CBT-2553 is historical. DORES 1120-filer registration, federal approval proof, Shareholder Jurisdictional Consent, and timely CBT-100S filing remain separate compliance steps and do not condition recognition. Formation date is not the test; earlier periods may require CBT-2553-R retroactive-relief review.

Reasonable compensation follows the owner's actual services, duties, hours, experience, seasonality, and current comparable-pay evidence. Supply-chain sourcing, listing work, advertising, inventory planning, and financial oversight can be relevant duties, but no job title, revenue amount, season, or fixed split determines compensation. There is no IRS-published 50/50 safe harbor; apply Treas. Reg. Section 1.162-7 and the complete facts before nonwage distributions.

Inventory valuation must follow the taxpayer's permitted, adopted, and consistently applied method; Amazon's physical fulfillment flow does not select the tax method. A change can require Form 3115 and the applicable consent procedures. Slow-moving or obsolete inventory, reimbursements, and losses require the actual basis, inventory method, records, recovery, and timing facts. Verify current account claim terms separately from the tax classification.

The OBBBA (One Big Beautiful Bill Act, signed July 4, 2025) introduced several changes directly affecting FBA sellers. For third-party-network (TPSO) transactions, the mandatory Form 1099-K threshold was restored to more than $20,000 in gross payments AND more than 200 transactions, eliminating the planned $600 TPSO threshold; payment-card merchant acquirers have no federal de-minimis threshold, and a TPSO may furnish below its mandatory threshold. New IRC Section 174A (added by OBBBA Section 70302(a)) permanently establishes full expensing for domestic R&E expenditures. R&E expenditures attributable to research conducted outside the United States, Puerto Rico, or a U.S. possession remain under Section 174 and generally are amortized over 15 years. A manufacturer's or payee's location does not by itself determine where the research was conducted or whether an amount is R&E; classify the actual activities, contract, performance location, purpose, and timing. 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 and placed in service after January 19, 2025; property bought under a written binding contract signed before January 20, 2025 is treated as acquired before that date and stays on the prior phase-down percentage.

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.

A Voluntary Disclosure Agreement may be available after a jurisdiction-specific review establishes an overdue filing or payment duty. Eligibility, anonymity, look-back periods, penalty relief, marketplace-only treatment, and participation in the Multistate Tax Commission process vary, and contacting a state prematurely can affect available relief. Preserve inventory and channel reports, avoid assuming that an Amazon warehouse location alone proves a liability, and consult a qualified multistate tax-controversy professional before approaching a state. Monaco CPA does not provide VDA or other-state disclosure representation.

For a financing product, obtain the actual agreement and statements and classify the advance, principal, interest, fees, repayment rights, and settlement deductions from those terms. A qualifying debt instrument generally separates nondeductible principal from potentially deductible business interest under Section 163 and its limits. A merchant-cash-advance label does not by itself establish debt, a receivables sale, timing, deductibility, or a return line; reconcile the actual arrangement and records.

Reconcile returns, refunds, claims, fee credits, inventory dispositions, reimbursements, and settlement deductions from the actual order, account, and inventory records. Their return treatment depends on the transaction, product basis, accounting and inventory method, recovery, and complete facts; a platform adjustment label does not automatically establish a return allowance, deductible loss, or return line.

For Form 1099-K reconciliation, export the order, settlement, tax-document, refund, fee, inventory, and deposit reports actually available for the full tax year. Compare the furnished form to the underlying gross payment activity and document timing, refunds, taxes, fees, and other differences. Report names, navigation, cadence, and fields can change, so preserve the account records used for the reconciliation rather than relying on a fixed platform checklist.

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.