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Tax Intelligence › Client Playbooks › E-Commerce / Amazon Seller IRC §162 • §263A • §471 • §199A Client Playbook — E-Commerce Business Updated April 2026

Tax Planning Playbook for E-Commerce Sellers and Amazon FBA Businesses: Inventory, COGS, Sales Tax Nexus, Entity Structure, and Every Strategy That Reduces an Online Seller’s Tax Bill in 2026

E-commerce sellers — Amazon FBA sellers, Shopify store owners, Etsy sellers, eBay resellers, and dropshippers — face a unique combination of federal income tax, self-employment tax, and multi-state sales tax obligations that most preparers are not equipped to handle. An Amazon FBA seller with $500,000 in gross sales and $200,000 in net profit can reduce their federal income tax by $40,000–$80,000 with proper COGS accounting, entity structure, retirement plan contributions, and home office deduction. The post-Wayfair sales tax landscape means most e-commerce sellers have nexus in dozens of states and face significant compliance obligations. This playbook covers every strategy for e-commerce businesses — written for the practitioner who wants to deliver comprehensive results.

$5,000
2026 1099-K reporting threshold — Amazon, Shopify, PayPal, and other payment processors must issue a 1099-K for any seller who receives $5,000 or more in gross payments (IRS Notice 2024-85)
45 States
States with economic nexus thresholds post-Wayfair — most states require sales tax collection once a seller exceeds $100,000 in sales or 200 transactions in the state, regardless of physical presence
COGS First
Cost of goods sold is the largest deduction for most e-commerce sellers — proper COGS accounting (including Amazon FBA fees, shipping, returns, and inventory adjustments) is the foundation of every e-commerce tax plan
20%
QBI deduction on qualified business income from e-commerce sales (IRC §199A, permanent per OBBB) — a seller with $200,000 in QBI deducts $40,000 without any additional cash outlay
✓ 2026 1099-K Threshold Confirmed: $5,000 (IRS Notice 2024-85) ✓ Wayfair Economic Nexus Standard Confirmed (South Dakota v. Wayfair, 2018) ✓ §263A UNICAP Rules Confirmed for Inventory Businesses ✓ §199A QBI Deduction Confirmed: 20% (OBBB, permanent) ✓ Small Business Inventory Exception Confirmed: $30M avg gross receipts (IRC §471(c))
Business DeductionsIRC §162
Inventory / COGSIRC §471 • §263A
Small Biz Inventory ExceptionIRC §471(c) (<$30M)
QBI DeductionIRC §199A
Sales Tax NexusSouth Dakota v. Wayfair (2018)
S-Corp ElectionIRC §1362

COGS and Inventory Accounting: The Foundation of Every E-Commerce Tax Plan

For e-commerce sellers, cost of goods sold (COGS) is almost always the largest deduction — often representing 40–70% of gross sales. Accurate COGS accounting is the foundation of every e-commerce tax plan because it directly reduces gross income before any other deductions are applied. Many e-commerce preparers understate COGS by failing to include all allowable costs, resulting in clients paying income tax on income they never actually earned.

What is included in COGS for an e-commerce seller:

  • Cost of inventory purchased for resale (product cost, including shipping from supplier)
  • Amazon FBA fees (fulfillment fees, storage fees, referral fees) — these are deductible as either COGS or business expenses; many practitioners include FBA fees in COGS for simplicity
  • Customs duties and import fees on imported inventory
  • Freight and shipping costs to Amazon warehouses (inbound shipping)
  • Returns and refunds — the cost of returned inventory reduces COGS
  • Inventory shrinkage and write-offs — damaged, lost, or stolen inventory is deductible
  • Product photography and listing creation costs (if capitalized into inventory cost)

The IRC §471(c) small business exception: E-commerce sellers with average annual gross receipts of $30 million or less (for the three prior tax years) are exempt from the complex UNICAP rules under IRC §263A and can use a simplified inventory accounting method. Under this exception, the seller can treat inventory costs as deductible when paid (cash method) rather than capitalizing them into inventory and deducting when sold. This simplification can significantly reduce the complexity of e-commerce tax accounting for smaller sellers.

Sales Tax Nexus After Wayfair: What Every E-Commerce Practitioner Must Know

The Supreme Court’s 2018 decision in South Dakota v. Wayfair eliminated the physical presence requirement for sales tax nexus. States can now require out-of-state sellers to collect and remit sales tax based on economic activity alone — typically $100,000 in sales or 200 transactions in the state per year. As of 2026, 45 states (plus Washington D.C.) have economic nexus laws, and most have thresholds of $100,000 in sales or 200 transactions. Only New Hampshire, Oregon, Montana, Alaska, and Delaware have no state sales tax.

For Amazon FBA sellers, the nexus analysis is particularly complex because Amazon stores inventory in fulfillment centers across the country. When Amazon stores a seller’s inventory in a fulfillment center in a state, the seller typically has physical nexus in that state — regardless of whether they have met the economic nexus threshold. Amazon Marketplace Facilitator laws in most states now require Amazon to collect and remit sales tax on behalf of third-party sellers for sales made through the Amazon marketplace. However, sellers who also sell through their own Shopify store, Etsy shop, or other channels must collect and remit sales tax themselves for those channels.

Practitioners advising e-commerce clients should: (1) identify all states where the client has physical nexus (FBA warehouses, employees, offices); (2) identify all states where the client has economic nexus; (3) determine which states are covered by marketplace facilitator laws for Amazon sales; (4) identify any states where the client has uncollected sales tax exposure; and (5) advise on voluntary disclosure programs for states where the client has past-due sales tax obligations.

Frequently Asked Questions

My Amazon FBA client received a 1099-K for $800,000 in gross sales but says their actual profit is only $120,000. How do I reconcile this?›

This is the most common e-commerce tax question and the source of the most errors. The 1099-K reports gross sales proceeds — the total amount customers paid, before deducting Amazon’s fees, COGS, returns, or any other expenses. The seller’s actual taxable income is gross sales minus COGS minus all other business expenses. To reconcile: (1) Start with the gross 1099-K amount ($800,000) as gross income on Schedule C. (2) Deduct COGS: the cost of inventory sold during the year. For a seller with $800,000 in gross sales and a 50% gross margin, COGS is approximately $400,000. (3) Deduct Amazon fees: FBA fulfillment fees, storage fees, and referral fees (typically 15–30% of gross sales = $120,000–$240,000). (4) Deduct other business expenses: advertising (Amazon PPC, external ads), shipping supplies, software (inventory management, repricing tools), home office, and other expenses. (5) The result is net profit, which should be close to the client’s reported $120,000. The difference between the $800,000 1099-K and the $120,000 net profit is $680,000 in COGS and expenses — all of which are deductible. Failing to properly account for COGS and Amazon fees results in the seller paying income tax and SE tax on $680,000 of income they never actually earned. Practitioners should obtain the seller’s Amazon Seller Central annual report, which breaks down gross sales, returns, Amazon fees, and net proceeds by month, to verify the COGS and fee calculations.

My e-commerce client has sales in 30 states but has never collected or remitted sales tax. What are their options?›

This is a common situation for e-commerce sellers who grew quickly after Wayfair without addressing sales tax compliance. The client has several options, depending on the magnitude of the exposure and their risk tolerance: (1) Voluntary Disclosure Programs (VDAs). Most states offer voluntary disclosure programs that allow businesses to come forward, pay back taxes for a limited lookback period (typically 3–4 years), and receive a waiver of penalties and sometimes interest. VDAs are the most common resolution for e-commerce sellers with multi-state exposure. The Multistate Tax Commission (MTC) offers a streamlined VDA program that allows sellers to apply to multiple states simultaneously. (2) Amnesty programs. Some states periodically offer amnesty programs that allow businesses to pay back taxes without penalties or interest for a limited time. These are less common than VDAs but can be very favorable when available. (3) Prospective compliance only. For sellers with minimal historical exposure (e.g., just crossed the economic nexus threshold recently), it may be appropriate to simply register in all states going forward and not address historical periods. This approach carries the risk that a state could audit the seller and assess back taxes, penalties, and interest for the historical period. (4) Nexus study. Before taking any action, the practitioner should conduct a nexus study to identify which states the client actually has nexus in (physical and economic), the magnitude of the exposure in each state, and whether any marketplace facilitator laws reduce the client’s direct obligation. Amazon’s marketplace facilitator status in most states means that Amazon collected and remitted sales tax on Amazon marketplace sales — the client’s direct exposure may be limited to sales made through other channels (Shopify, Etsy, direct website).

More Tax Planning FAQs

How should an e-commerce seller handle inventory for tax purposes?
E-commerce sellers must account for inventory using either FIFO (First In, First Out), LIFO (Last In, First Out), or specific identification. LIFO can reduce taxable income during periods of rising inventory costs but requires IRS approval (Form 970). The uniform capitalization rules (§263A) require sellers with average annual gross receipts over $30 million to capitalize certain indirect costs into inventory.
What is the tax treatment of Amazon FBA fees?
Amazon FBA fees (fulfillment fees, storage fees, referral fees) are deductible as business expenses. These fees reduce the seller’s net revenue and are reported on Schedule C or the S-Corp return. Amazon provides a detailed fee report that can be used to substantiate the deduction. Sellers should reconcile their Amazon settlement reports with their bank statements monthly.
How does sales tax nexus affect an e-commerce seller’s federal taxes?
Sales tax is a state tax issue, not a federal tax issue. However, sales tax collected from customers is not income to the seller — it is a liability that must be remitted to the state. E-commerce sellers who fail to collect and remit sales tax face state penalties and interest. The Supreme Court’s decision in South Dakota v. Wayfair (2018) established economic nexus, requiring sellers to collect sales tax in states where they have $100,000+ in sales or 200+ transactions.
Can an e-commerce seller deduct the cost of product photography?
Yes. Product photography costs are deductible as advertising or marketing expenses under §162. This includes photographer fees, props, studio rental, and photo editing software. Product photography is a necessary cost of selling online and is fully deductible in the year incurred.
What is the tax treatment of returns and refunds for e-commerce sellers?
Refunds issued to customers reduce gross revenue in the year paid. E-commerce sellers should track returns and refunds carefully and reconcile them with their payment processor reports. Inventory returned by customers is added back to inventory at cost. Sellers who use the accrual method must accrue a reserve for expected returns at year-end.
How does the home office deduction apply to an e-commerce seller?
An e-commerce seller who uses a dedicated home office space exclusively and regularly for business (managing listings, processing orders, customer service) qualifies for the home office deduction under §280A. If the seller also stores inventory at home, the storage space may be separately deductible even if it is not used exclusively for business. The home office must be the seller’s principal place of business.
What retirement accounts are available to an e-commerce business owner?
E-commerce business owners can establish a Solo 401(k) (up to $70,000 in 2026), a SEP-IRA (25% of net self-employment income up to $70,000), or a SIMPLE IRA. For owners with employees, a SIMPLE IRA or 401(k) plan must cover eligible employees. The employer match is deductible as a business expense.
How should an e-commerce seller handle multi-state income taxes?
E-commerce sellers with nexus in multiple states may owe income taxes in those states. Most states apportion income based on sales, payroll, and property factors. Sellers with significant sales in a state should consult a tax professional to determine whether they have income tax nexus and must file a non-resident return.
How does the S-Corp election reduce self-employment tax?
An S-Corp election allows the owner to split income between a reasonable salary (subject to 15.3% FICA on the first $176,100 in 2026) and distributions (not subject to FICA). For a business owner with $200,000 in net profit paying an $80,000 salary, the annual SE tax savings are approximately $15,500–$18,500. The S-Corp must file Form 2553 within 75 days of formation.
What is the Section 199A QBI deduction and how does it apply?
The §199A deduction allows pass-through business owners to deduct up to 23% of qualified business income (QBI) from taxable income (increased from 20% under OBBBA). For taxpayers above $403,500 (MFJ) in 2026, the deduction is limited to the greater of 50% of W-2 wages or 25% of W-2 wages plus 2.5% of qualified property. Specified Service Trades or Businesses (SSTBs) phase out above this threshold.
What retirement plan options are available for self-employed professionals?
Self-employed professionals can establish a Solo 401(k) (up to $70,000 in 2026), a SEP-IRA (25% of net self-employment income up to $70,000), a SIMPLE IRA ($16,500 + $3,500 catch-up), or a Defined Benefit Plan (up to $280,000+ depending on age). The Solo 401(k) is the best option for most self-employed professionals because it allows the highest contributions relative to income.
What steps should an e-commerce seller take to properly set up inventory accounting for tax compliance?
E-commerce sellers must first determine the appropriate inventory accounting method, typically either the specific identification method or the first-in, first-out (FIFO) method, consistent with §471. They should establish a reliable system to track inventory purchases, costs, and sales in real time to comply with IRS requirements. Additionally, sellers must capitalize inventory costs under §263A, including direct and certain indirect costs, and ensure these amounts are reported correctly on Schedule C or corporate returns. Accurate inventory records are crucial for calculating cost of goods sold (COGS) and preventing audit triggers related to misstated income.
When should an Amazon FBA e-commerce seller file estimated tax payments, and what thresholds apply for 2026?
For 2026, e-commerce sellers using Amazon FBA must file estimated tax payments if they expect to owe at least $1,000 in federal income tax after subtracting withholding and refundable credits, per Pub 505 guidelines. Estimated payments are generally due quarterly on April 15, June 15, September 15, and January 15 of the following year. Sellers with net earnings from self-employment of $400 or more must also pay self-employment tax under §1401. Failure to make timely estimated payments may result in underpayment penalties.
What documentation should a tax professional require from an e-commerce client to substantiate deductions for product inventory and related expenses?
Tax professionals should collect detailed purchase invoices, supplier contracts, and inventory count records to substantiate inventory costs under §162 and §263A. Documentation should also include records of inbound shipping fees, storage costs for Amazon FBA, and any other direct costs that contribute to inventory valuation. Additionally, evidence of returns and restocking fees must be maintained to adjust COGS accurately. Maintaining contemporaneous and organized records reduces audit risk and supports compliance with IRS regulations.
What are the common audit triggers related to sales tax nexus and how can e-commerce sellers mitigate these risks?
Common audit triggers include inconsistent or missing sales tax filings across states where nexus thresholds are met, failure to register for sales tax permits, and discrepancies between reported sales and sales tax collected. For 2026, economic nexus thresholds typically start at $100,000 in gross sales or 200 separate transactions in a state. E-commerce sellers should implement comprehensive nexus tracking software, reconcile sales data regularly, and ensure timely filing of returns. Proper nexus management reduces exposure to state audits and associated penalties.
How should a tax professional advise a client who operates both an e-commerce store and a content creation business in terms of combining income and deductions?
When a client operates both an e-commerce store and a content creation business, income and expenses should be reported separately on Schedule C for each trade or business, as required by §199A guidance for qualified business income deductions. This distinction is important because different activities may have different risk profiles, deductions, and eligibility for the QBI deduction. Combining income streams could obscure accurate tax reporting and complicate compliance. Advising separate accounting and bookkeeping systems for each activity helps maintain clarity and supports optimized tax planning.
How does the treatment of costs associated with Amazon FBA inventory storage compare with traditional inventory storage costs for tax purposes?
Costs related to Amazon FBA inventory storage are generally treated as part of inventory carrying costs and must be capitalized under §263A, similar to traditional warehouse storage expenses. However, FBA fees may include distinct charges like fulfillment and storage fees, which should be carefully allocated between COGS and operating expenses. Unlike traditional storage costs, FBA fees are often invoiced monthly and can fluctuate based on inventory volume and time held, requiring thorough documentation. Proper classification ensures accurate deduction timing and compliance with IRS capitalization rules.
What key questions should a tax professional ask an e-commerce seller client to uncover potential tax planning opportunities and compliance issues?
Key questions include asking about the client’s inventory tracking methods and valuation approach to verify compliance with §471 and §263A, how they manage sales tax nexus across multiple states, and whether they have separate accounting for different business activities. Inquiring about their estimated tax payment history and whether they are aware of self-employment tax obligations under §1401 is essential. Additionally, asking about any use of third-party fulfillment services like Amazon FBA can reveal deductible fees and potential audit risks. These questions help identify opportunities to optimize deductions and mitigate compliance exposures.

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Professional Disclaimer

The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.

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