Running an online store comes with real costs. The IRS lets you subtract ordinary and necessary business expenses from your revenue before calculating what you owe, and for e-commerce sellers, e-commerce tax deductions can add up to significant savings across inventory, shipping, software, ads, and more.
Many sellers miss deductions simply because they didn’t realize a cost qualified or failed to keep proper records. Both problems are easy to fix with the right guidance. This guide walks through every major category of ecommerce tax deductions so you can approach tax season with confidence.
At AMZ Accountant, we work with e-commerce brands every day who leave money on the table simply because their books aren’t organized to capture it. These deductions aren’t just for large companies; they apply whether you sell on Amazon, Shopify, Etsy, or your own site.
The Biggest Write-Offs To Claim First
Your largest deductions tend to come from the core costs of running your store. That means what you paid for the products you sold, what it cost to get those products to customers, and what you paid the platforms that made those sales possible.
Cost Of Goods Sold And COGS Calculation
Cost of goods sold, or COGS, is typically the single largest deduction for product-based sellers. It covers what you paid to acquire or produce the items you actually sold during the year.
Your basic COGS calculation is:
Beginning Inventory + Inventory Purchased During The Year – Ending Inventory = COGS
COGS includes wholesale product costs, dropshipping supplier costs, manufacturing expenses, and inventory storage fees, such as Amazon FBA warehousing charges. If you hold physical stock, your year-end inventory count directly affects this number, so accuracy matters.
Shipping, Packaging, And Fulfillment Costs
Shipping and packaging expenses are fully deductible as a cost of doing business. This includes postage with USPS, UPS, or FedEx, as well as boxes, poly mailers, bubble wrap, tape, and printed labels.
FBA fees that cover picking, packing, and shipping through Amazon are also deductible as shipping and packaging costs. If you use a third-party logistics provider, those fees also qualify. Save every carrier invoice and fulfillment statement as backup documentation.
Platform And Marketplace Fees
Every dollar you pay to sell on a marketplace reduces your taxable income. Platform fees include your monthly Shopify subscription, Shopify transaction fees, Amazon Seller Central referral fees, FBA fees not already counted under fulfillment, WooCommerce extensions, and BigCommerce plan costs.
These fees can easily total thousands per year across channels. Pull your annual fee summaries from each platform and make sure your bookkeeper or accountant captures all of them.
Marketing, Software, And Store Operations
Beyond inventory and fulfillment, the day-to-day costs of running and growing your store generate significant deductions. Paid ads, software tools, and payment processing charges are all fair game.
Advertising Spend Across Paid Channels
Advertising and marketing expenses are fully deductible in the year you spend them. This covers Google Ads, Facebook Ads, TikTok Ads, Amazon PPC, influencer payments, and email marketing platforms like Klaviyo and Mailchimp.
Track your spend by platform each month. If you pay a freelancer or agency to manage your ads, those fees are deductible too under professional services.
Software Tools And Recurring Subscriptions
Software subscriptions used for your business are deductible. That includes accounting software like QuickBooks or Xero, inventory management tools, project management apps, SEO platforms, and any Shopify apps you pay for monthly.
A $50-per-month stack of tools adds up to $600 per year in deductions. Keep a simple list of every recurring software charge tied to your store so nothing slips through. Annual plans often show up as a single charge and can be easy to miss.
Payment And Banking Charges
Transaction fees and payment processing fees from Stripe, PayPal, Square, or Shopify Payments are deductible operating expenses. So are bank fees on your business bank account, wire transfer fees, and any merchant account charges.
These fees feel small individually but compound quickly at volume. Keep your business accounts separate from personal accounts to make tracking clean.
Home, Vehicle, And Insurance Expenses
Several personal-feeling expenses actually have legitimate business deductions attached to them. The key is to meet the IRS rules for each category and keep the required documentation.
Home Office Rules And Home Office Expenses
You can claim the home office deduction if you use a specific area of your home regularly and exclusively for your business. That space must be your principal place of business or where you manage administrative work.
Two methods are available. The simplified method gives you $5 per square foot, up to 300 square feet, for a maximum deduction of $1,500.
The actual expense method lets you deduct a percentage of your rent or mortgage interest, utilities, and internet equal to the share of your home used for business. The actual method takes more record-keeping but often produces a larger deduction.
Business Driving And The Mileage Deduction
If you drive for business purposes, such as picking up supplies, dropping off shipments, or meeting a supplier, those miles are deductible. For 2026, the IRS standard mileage rate applies to business miles logged during the year.
The mileage deduction requires a mileage log that records the date, destination, business purpose, and miles driven. A simple app or spreadsheet works fine.
Commuting from home to a separate office does not count, but driving from your home office to a post office or warehouse does.
Coverage That Protects The Business
Business insurance premiums are deductible. For e-commerce sellers, that typically includes product liability insurance and commercial property insurance for inventory or equipment.
If you carry a business owner’s policy, the full premium is deductible. Health insurance premiums may also be deductible if you are self-employed and not eligible for coverage through a spouse’s employer plan.
Keep your policy documents and payment records organized alongside your other business receipts.
Taxes, Contractors, And Compliance Basics
Running a business solo means you handle tax obligations that employers normally split with employees. Getting these categories right avoids penalties and keeps more money in your pocket.
Self-Employment Tax And Quarterly Payments
When you work for yourself, you pay self-employment tax to cover both the employee and employer sides of Social Security and Medicare. The rate is 15.3 percent on net self-employment income.
You can deduct half of that self-employment tax on your income tax return. If you expect to owe more than $1,000 for the year, you are required to make quarterly estimated tax payments.
These are due in April, June, September, and January. Missing them triggers penalties, so setting aside 25 to 30 percent of your net profit each month makes those deadlines manageable.
Sales Tax Nexus For Multistate Sellers
Sales tax nexus determines which states can require you to collect and remit sales tax. Physical presence in a state, such as having inventory stored in an Amazon warehouse, creates nexus.
Many states also have economic nexus thresholds based on revenue or transaction volume. If you sell across multiple states, you may have filing obligations in several of them.
Tools like TaxJar or Avalara automate much of this, but a tax professional familiar with sales tax nexus rules can help you assess your exposure and avoid back taxes.
Contractor Payments And 1099 Filing
If you pay a contractor $600 or more during the year, you are required to file a 1099-NEC with the IRS and send a copy to the contractor. This applies to freelance designers, copywriters, ad managers, and virtual assistants.
Collect a W-9 from every contractor before you pay them. Missing 1099-NEC filings can result in penalties and may draw IRS attention.
Your accounting software can usually generate 1099 forms automatically if you have tracked contractor payments correctly throughout the year.
Tax Planning Moves That Can Increase Savings
Deductions are only one piece of the picture. Strategic tax planning throughout the year can reduce your bill even further, and recent law changes create new opportunities worth knowing about.
Retirement Contributions For Solo Owners
Contributing to a retirement account is one of the most effective ways to reduce taxable income. A solo 401(k) allows you to contribute as both the employee and employer, with combined limits well above what a traditional IRA allows.
A SIMPLE IRA is another option, especially if you have a small number of employees. Contributions reduce your taxable income dollar for dollar.
Year-Round Tax Strategy And Documentation
Good tax strategy is not a once-a-year activity. Reviewing your financials quarterly lets you spot missed deductions, correct categorization errors, and adjust your estimated payments before penalties accumulate.
Keep digital copies of all receipts, invoices, and bank statements. Cloud storage or receipt capture apps make this easy.
Recent Law Changes To Watch
The Tax Cuts and Jobs Act introduced the qualified business income deduction, which allows many self-employed sellers to deduct up to 20 percent of their qualified business income. This deduction has been a meaningful benefit for solo ecommerce operators.
The One Big Beautiful Bill Act, currently moving through Congress in 2026, proposes extending and potentially expanding several provisions from the Tax Cuts and Jobs Act.
Changes to bonus depreciation rules and small business deductions could affect how you account for equipment purchases and other capital expenses. Working with a knowledgeable accountant keeps you current as these rules evolve.
Make The Most Of Every Deduction
The range of ecommerce tax deductions available to online sellers is broad. From COGS and platform fees to retirement contributions and home office expenses, each category represents real money you are entitled to keep.
The biggest challenge for most sellers is not the rules themselves; it is having the systems in place to capture everything year-round. Clean books, organized receipts, and a clear understanding of which expenses qualify make tax season straightforward.
If you want to make sure you are claiming everything you have earned, AMZ Accountant is ready to help. Book your free consultation today and find out exactly how much you could be saving on your next tax return.
Frequently Asked Questions
What business expenses can I deduct when running an online store?
Ordinary and necessary expenses such as inventory, platform fees, shipping, advertising, software subscriptions, home office costs, and professional services are deductible.
Can I write off inventory and cost of goods sold for my business taxes?
Yes. COGS is deducted from your gross revenue and includes the cost to purchase, manufacture, or source products sold during the tax year.
Are website, hosting, and software subscription costs tax-deductible?
Yes. Website, hosting, and software subscriptions like Shopify, domain registration, plugins, and accounting tools are fully deductible as business expenses.
How does the $2,500 de minimis safe harbor rule work for small purchases?
You can deduct items costing $2,500 or less per item or invoice as expenses instead of depreciating them. This simplifies bookkeeping for smaller equipment purchases.
Can I deduct home office expenses if I manage my store from home?
Yes, if you use a dedicated space regularly and exclusively for business. Use the simplified method ($5/sq ft up to 300 sq ft) or the actual expense method.
What records and receipts should I keep to support my deductions?
Keep invoices, bank and credit card statements, shipping receipts, platform fee summaries, and contractor agreements for at least three years after filing.