Tax Deductions for Ecommerce Sellers: The Complete Guide

COGS includes the direct costs of inventory you sell: product purchase cost, shipping to your warehouse/Amazon FBA facility, packaging materials (boxes, tape, labels), customs duties, and import fees. If you buy a product for $15, ship it to Amazon for $2, and package it for $1, your COGS is $18. Common mistake: sellers include indirect costs like platform fees or advertising in COGS; these are separate deductions. A $200K seller might have $80K in COGS (40% of revenue) and another $25K in platform fees (12.5%). Track these separately on Schedule C for proper tax reporting.

Yes, Amazon FBA fees are fully deductible. These include: fulfillment fees (picking, packing, shipping), monthly storage fees, long-term storage fees (for inventory stored >365 days), removal fees, and return processing fees. FBA fees are NOT part of COGS; they're a separate operating expense deducted on Schedule C. A seller with $150K in FBA fees annually deducts the full amount. Similarly, Shopify subscription ($29-$299/month), Etsy shop fees, and payment processing fees (Stripe 2.9% + $0.30) are all fully deductible. Track platform fees separately from COGS.

Yes, but the deduction location matters. If you buy packaging (boxes, bubble wrap, tissue paper) to ship inventory TO your warehouse or Amazon FBA center, it's part of COGS and reduces gross profit. If you buy packaging to ship final products TO customers (branded boxes, thank you cards), it's an operating expense. A $150K seller might spend $8K on inbound packaging (COGS) and $6K on outbound packaging (expense). Both are deductible but in different places on the tax return. Polymailers, packing tape, foam inserts, printed boxes, and branded tissue are all deductible depending on whether they're for inbound inventory preparation or outbound customer shipments.

Inventory does NOT qualify for depreciation; it's valued at cost and expensed when sold (COGS). However, equipment used to store, manage, or fulfill inventory CAN be depreciated. Example: A $5,000 industrial shelving unit for storage depreciates over 7 years (~$714/year). A $3,000 label printer depreciates over 5 years. The key: the asset itself is deductible, not the inventory. Section 263A uniform capitalization rules may apply if you have more than $25 million in annual receipts; the rules require capitalizing certain indirect costs (labor, utilities) into inventory cost. For most ecommerce sellers under this threshold, COGS is straightforward: product + inbound shipping + packaging.

Returns reduce revenue dollar-for-dollar (refunded to customer). If you accepted $200K in orders but $15K were returned, your gross revenue is $185K. Damaged or unsellable inventory is deductible as a loss. If you're holding $50K in inventory and $5K is damaged, obsolete, or worthless, you can claim a casualty loss for the $5K (requires documentation). For returns due to customer dissatisfaction, the refund reduces income; for damaged goods you bought from a supplier, you may have a claim against the supplier or a loss deduction. Amazon return fees (restock fees, damages) are operating expenses, not reductions to COGS.

No. You have 'economic nexus' obligations only in states where you've triggered their threshold. As of 2026, most states require sales tax registration if you: (1) exceed $100K-$500K in annual sales (state-dependent), or (2) have 200+ transactions in a state. Example: If you sell $120K worth of products to customers in California (threshold $600K), you don't need to register. If you sell $45K to Texas and $48K to Florida (threshold $100K each), you're below. Once you exceed a state's threshold, you MUST register and collect/remit sales tax. Failure to register when required triggers penalties and back-tax liability. Use TaxJar, Avalara, or a CPA to track nexus. This is NOT a deduction; it's a compliance requirement.

An S-Corp election saves 15.3% in self-employment tax on distributions. If you're netting $75K-$100K+ after expenses, an S-Corp becomes attractive. Example: A seller with $150K gross revenue, $60K COGS, $25K platform fees, and $15K other expenses nets $50K profit. With an S-Corp, they'd pay themselves $30K-$35K in W-2 wages (subject to payroll tax, ~$4,590 in payroll taxes) and take $15K-$20K as a dividend (no self-employment tax). Total tax savings: ~$2,000-$3,000/year. Cost: S-Corp formation ($500-$1,500), annual state fees ($50-$500), and additional accounting ($1,500-$3,000/year). The savings justify it at $75K+ net profit. Sellers below that should stay as sole proprietors or LLCs taxed as partnerships.

Yes. Use the simplified method ($5/sq ft of dedicated space, max 300 sq ft = $1,500/year) or the actual expense method (percentage of home expenses: mortgage interest, property tax, utilities, insurance, repairs). If you have a 200 sq ft office dedicated exclusively to your ecommerce business (inventory management, customer service, order fulfillment coordination), the simplified method gives you $1,000/year. The actual expense method might yield more if your home is large: if your 2,000 sq ft home has 200 sq ft office, you deduct 10% of all home expenses (utilities, insurance, property tax, mortgage interest). Keep detailed records and ensure the space is used exclusively for business; a guest bedroom that doubles as an office doesn't qualify.

Inventory is NOT deductible until sold. If you buy $50K in inventory this year but only sell $30K of it, your COGS is $30K (the portion sold). The remaining $20K stays on your balance sheet as 'inventory' and reduces your profit by that $20K (it's an asset). When you sell that inventory next year, you'll deduct it then as COGS. This is why inventory accounting matters: you can't deduct inventory when you buy it, only when you sell it. This is different from business expenses (rent, software, ads) which are deductible in the year incurred. Year-end inventory counting is critical for tax accuracy.

Yes, 100% deductible in the year incurred. Amazon Sponsored Products ads, Facebook/Instagram ads, influencer marketing, email marketing tools, SEO services, content creation: all deductible. A $150K seller might spend $20K-$30K on ads (13-20% of revenue is typical). All of it reduces your taxable income. Digital marketing tools (Klaviyo, Mailchimp, ConvertKit, etc.) are fully deductible. Photography and product listing services are deductible. The only exception: if you create an asset with multi-year value (e.g., custom software for your store, brand photography used for multiple campaigns), you might capitalize and depreciate it over time. But most marketing spend is deductible immediately.

Sales tax collected is NOT your income; it's held in trust for the state. If you collect $10K in sales tax, you hold it and send it to the state on your sales tax return (typically quarterly). Your 'taxable income' excludes sales tax collected. Most ecommerce platforms (Shopify, Amazon) auto-calculate and report sales tax. However, you're responsible for filing the actual sales tax return and sending the money to the state. Failure to remit collected sales tax can result in personal liability (even if your business fails). Many sellers mistakenly treat collected sales tax as income; this is a critical compliance error.