Tax Deductions Every Online Seller Should Know
Cost of Goods Sold
Cost of goods sold is typically the largest deduction for ecommerce businesses and includes the full landed cost of products you sell: purchase price, inbound shipping, import duties, customs fees, and packaging materials. COGS is deducted on your tax return as a direct offset to revenue before calculating gross profit. A business with $300,000 in revenue and $120,000 in COGS starts with $180,000 in gross profit as the basis for further deductions, not the full $300,000.
COGS is deducted as products sell, not when you purchase inventory. Buying $50,000 of inventory in December does not create a $50,000 deduction for that tax year unless you sell all of it before year end. The deduction matches revenue recognition: when a unit sells, its cost moves from inventory to COGS. This is why accurate inventory accounting is essential for correct tax reporting.
Home Office Deduction
If you use a dedicated space in your home regularly and exclusively for business, you can deduct a portion of your housing costs. The IRS offers two methods: the simplified method at $5 per square foot up to 300 square feet ($1,500 maximum deduction), or the regular method that calculates the percentage of your home used for business and applies that percentage to your actual housing costs including rent or mortgage interest, utilities, insurance, repairs, and depreciation.
The regular method typically produces a larger deduction for home-based ecommerce sellers. If your home office is 200 square feet in a 2,000 square foot home (10% of total area), you can deduct 10% of your rent or mortgage interest, 10% of property taxes, 10% of utilities, 10% of homeowners insurance, and 10% of maintenance and repairs. For a seller paying $2,000 per month in rent, $300 in utilities, and $150 in insurance, the monthly deductible amount is $245, totaling $2,940 per year. Compare this to the simplified method at $1,000 (200 square feet x $5), and the regular method provides nearly triple the deduction.
If you use a garage, spare bedroom, or separate structure for inventory storage and order fulfillment in addition to an office space, you can deduct the square footage of both areas. A 200 square foot office plus a 400 square foot storage area in a 2,000 square foot home gives you a 30% deduction rate. Just ensure each space is used regularly and exclusively for business.
Shipping and Delivery Costs
Outbound shipping costs for delivering orders to customers are fully deductible as a business expense. This includes postage, carrier charges from USPS, UPS, FedEx, and DHL, shipping supplies like boxes, tape, labels, void fill, and poly mailers, and any shipping insurance you purchase for packages. If you offer free shipping, the cost is still deductible as your business expense even though the customer did not pay a separate shipping charge.
Inbound shipping from suppliers to your warehouse is part of your landed cost and gets deducted through COGS as products sell, not as a direct operating expense. The distinction matters for accurate categorization: outbound shipping is an operating expense deducted immediately, while inbound shipping is part of inventory cost deducted when products sell.
Advertising and Marketing
All advertising expenses are fully deductible in the year you incur them. Common ecommerce advertising deductions include Google Ads spend, Facebook and Instagram advertising, Amazon PPC and Sponsored Products, Pinterest ads, TikTok ads, influencer fees and gifted product costs, content marketing and copywriting services, graphic design for ads and social media, SEO tools and services, and email marketing platform costs.
Track advertising by platform in your bookkeeping so you can see both the total marketing deduction and the cost per platform. This dual purpose serves tax preparation and business analytics simultaneously. If you spent $48,000 on advertising last year, knowing it was $22,000 on Facebook, $15,000 on Google, $8,000 on Amazon PPC, and $3,000 on influencers helps you evaluate marketing ROI and maximize your deduction.
Software and Subscriptions
Monthly and annual subscription fees for business software are fully deductible. Common ecommerce software deductions include your Shopify or WooCommerce hosting plan, accounting software (QuickBooks, Xero, Wave), email marketing platforms (Klaviyo, Omnisend, Mailchimp), inventory management software, analytics and SEO tools, project management and communication tools, design software (Canva, Adobe), and any other software used for business operations.
Annual subscriptions paid upfront can be deducted in full in the year of payment if the subscription period does not extend more than 12 months beyond the payment date. A $1,200 annual subscription paid in January for the calendar year is fully deductible that year. A $1,200 subscription paid in October for October through September of the following year should technically be split between two tax years, though many small businesses deduct the full amount in the year of payment without issue.
Payment Processing Fees
Every dollar you pay in payment processing fees to Stripe, PayPal, Shopify Payments, Square, or any other processor is fully deductible as a business expense. For a business processing $300,000 in annual credit card sales at a 2.9% + $0.30 average rate, processing fees total approximately $9,570 per year. This is a substantial deduction that some sellers fail to track separately because the fees are deducted from deposits before reaching their bank account.
Make sure your accounting records gross revenue and processing fees separately rather than recording only the net deposit. If you only record net deposits, you are effectively claiming the processing fee deduction through reduced revenue rather than as an explicit expense. While the tax result is similar, the IRS expects your reported revenue to match your 1099-K, and recording gross revenue with separate fee expenses is the correct approach that avoids reconciliation issues.
Business Insurance
Business insurance premiums are fully deductible. Common policies for ecommerce businesses include general liability insurance, product liability insurance, cyber insurance, business property insurance covering inventory and equipment, and shipping insurance. If you carry a Business Owner's Policy (BOP) that bundles multiple coverage types, the full premium is deductible. Health insurance premiums for self-employed individuals are also deductible, though this deduction is taken on Form 1040 rather than Schedule C.
Professional Services
Fees paid to accountants, bookkeepers, attorneys, business consultants, and other professionals for business purposes are fully deductible. Common deductions include CPA fees for tax preparation and planning, bookkeeping service fees, legal fees for business formation, contracts, and intellectual property, trademark registration fees, and business consulting fees. If you hire a CPA at $2,000 per year for tax preparation and $1,000 per year for quarterly planning sessions, the full $3,000 is deductible.
Business Equipment and Depreciation
Equipment purchased for business use can be deducted through depreciation over its useful life or through Section 179 expensing, which allows you to deduct the full cost in the year of purchase for qualifying assets up to $1,220,000 (2024 limit, adjusted annually for inflation). Common ecommerce equipment deductions include computers and monitors, printers and label printers, camera equipment for product photography, warehouse equipment like shelving, carts, and packing stations, barcode scanners, and shipping scales.
Section 179 is extremely beneficial for ecommerce sellers making equipment purchases because it allows immediate full deduction rather than spreading the deduction over 3 to 7 years through standard depreciation. A $3,000 camera and lighting setup for product photography can be fully deducted in the purchase year under Section 179, giving you the full tax benefit immediately rather than $600 per year over five years.
Vehicle and Travel Expenses
If you use a vehicle for business purposes such as trips to your warehouse, post office, supplier meetings, trade shows, or bank, you can deduct vehicle expenses using either the standard mileage rate ($0.67 per mile for 2024) or actual expenses (gas, insurance, maintenance, depreciation) prorated by business-use percentage. Keep a mileage log with dates, destinations, business purposes, and miles driven. The IRS scrutinizes vehicle deductions heavily, so documentation is critical.
Travel expenses for business purposes including trade shows, supplier visits, and business conferences are deductible. This covers airfare, hotel, meals (at 50% deduction rate for business meals), rental cars, and incidental expenses. Keep receipts for all travel expenses and document the business purpose of each trip. Combining business travel with personal time is allowed, but only the business portion of expenses is deductible.
Additional Deductions
Bank fees and interest. Business bank account fees, credit card annual fees, and interest on business loans or credit cards used for business purposes are deductible. Interest on business loans used for inventory purchases, equipment, or operating expenses is a fully deductible business expense.
Education and training. Courses, books, conferences, and training programs that improve your skills in your current business are deductible. An ecommerce seller taking an advanced marketing course, attending an ecommerce conference, or purchasing business books can deduct these costs.
Business licenses and permits. State and local business license fees, seller's permits, and any other government fees required to operate your business are deductible.
Bad debts. If you sell wholesale and a customer fails to pay an invoice, the uncollectable amount can be written off as a bad debt deduction. This is less common for direct-to-consumer ecommerce but applies to B2B sellers.
Retirement contributions. Contributions to a SEP-IRA (up to 25% of net self-employment income, max $69,000 for 2024), Solo 401(k) (up to $23,000 employee contribution plus 25% employer contribution), or SIMPLE IRA reduce your taxable income while building retirement savings. These are among the most powerful tax reduction strategies available to self-employed ecommerce sellers.
Documentation and Record Keeping
The IRS requires adequate documentation for all business deductions. For expenses under $75, a bank or credit card statement showing the amount, date, and vendor is generally sufficient. For expenses of $75 or more, keep the original receipt or invoice showing the amount, date, vendor, and description of what was purchased. Digital receipts stored in your accounting software or a dedicated receipt management app are accepted by the IRS.
For deductions that the IRS commonly audits more closely, including home office, vehicle, meals, and travel, maintain detailed records throughout the year rather than reconstructing them at tax time. A home office deduction should be supported by a floor plan showing the dedicated space, photos of the office, and records of housing costs. Vehicle deductions need a contemporaneous mileage log. Meal deductions need receipts with notes about who was present and the business purpose discussed.
Your weekly bookkeeping routine should include tagging or attaching receipts to transactions as they occur. This takes seconds per transaction in the moment but can take minutes or longer to reconstruct months later, if the receipt can even be found at all.