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You just spent $47 on shipping supplies, $120 on gas driving to estate sales, and $15.99 on your inventory management subscription. By December, those numbers add up to thousands of dollars, money that could reduce your tax bill if you track it properly.
Most resellers leave money on the table because they don't know what qualifies as a deduction or they lose track of expenses throughout the year. This guide breaks down every legitimate write-off available to resellers, organized by category so you can systematically capture deductions you might be missing.
Whether you sell on eBay, Poshmark, Amazon, Mercari, or your own website, these deductions apply to your business. The key is understanding what the IRS allows and keeping records that support your claims.
A note before we start: this information applies to resellers operating as a business, not those selling occasional personal items. If you're buying inventory with the intent to profit, you're running a business in the eyes of the IRS.
Your largest deduction is typically the cost of the inventory you sell. This isn't technically a write-off, it's subtracted from your revenue before calculating profit, but the effect is the same: it reduces your taxable income.
If you buy a jacket for $5 at Goodwill, pay $2 to dry clean it, and sell it for $45, your COGS is $7. You're taxed on the $38 profit (minus other business expenses), not the full $45.
The IRS requires you to track inventory using a consistent method. Most resellers use one of two approaches:
Specific Identification: Track the exact cost of each item you sell. Best for higher-value items or smaller inventory volumes.
Average Cost: Calculate the average cost of similar items. Useful for bulk purchases where individual tracking is impractical.
Whatever method you choose, keep receipts. A photo of a thrift store receipt saved to a cloud folder takes seconds and can save you hundreds in an audit.
Every dollar you pay to selling platforms and payment processors is deductible. These fees add up quickly, often 15-30% of your gross sales.
Most platforms provide annual fee summaries in January. Download these immediately, they're your documentation for this entire category.
Everything related to getting products to customers qualifies as a business expense.
Pro tip: if you source free boxes from stores, that's great for your cash flow but doesn't create a deduction. Only money you actually spend counts.
If you use part of your home exclusively and regularly for your reselling business, you can deduct a portion of your housing costs.
Simplified Method: Multiply your office square footage (up to 300 sq ft) by $5. Maximum deduction: $1,500. No receipts needed beyond measuring your space.
Regular Method: Calculate the percentage of your home used for business, then apply that percentage to actual expenses:
Example: Your inventory room is 150 square feet in a 1,500 square foot apartment. That's 10% of your space. If your annual rent, utilities, and insurance total $18,000, your home office deduction is $1,800.
The space must be used exclusively for business. A guest bedroom where you also store inventory doesn't qualify. A closet used only for inventory does.
Driving to source inventory, drop off packages, or meet buyers creates deductible expenses.
Track every business mile driven and multiply by the IRS standard rate. This covers gas, maintenance, insurance, and depreciation in one simple calculation.
Deductible trips include:
Alternatively, track all vehicle costs and deduct the business-use percentage:
Keep a mileage log with dates, destinations, purposes, and miles driven. Apps like Everlance, MileIQ, or Stride automate this tracking.
The digital tools that run your business are fully deductible.
For items with mixed personal and business use, estimate your business percentage honestly. If you use your phone 60% for business, deduct 60% of the bill.
The small purchases that keep operations running add up over a year.
Money paid to professionals who help run your business is deductible.
Learning that improves your business skills qualifies as a deduction.
Spending money to grow your customer base is deductible.
These legitimate write-offs are frequently missed:
This one happens on your tax return, not during the year: you can deduct half of your self-employment tax from your income. This is calculated automatically when you file, but it's worth understanding.
Self-employment tax is 15.3% of your net earnings (Social Security and Medicare). The IRS allows you to deduct half of this amount because employers typically pay half of these taxes for employees.
If you're self-employed and not eligible for employer-sponsored health insurance through a spouse, you can deduct 100% of health insurance premiums for yourself, your spouse, and dependents.
This includes:
Deductions only count if you can prove them. Build these habits:
The IRS can audit returns up to three years back (six years if they suspect significant underreporting). Keep all business records for at least seven years to be safe.
Not everything is a write-off. Avoid claiming these:
Deductions reduce how much you owe, but you still need to pay throughout the year. If you expect to owe more than $1,000 in taxes, make quarterly estimated payments to avoid penalties.
Due dates: April 15, June 15, September 15, January 15
Calculate payments based on your expected profit minus deductions. Many resellers pay 25-30% of net profit to cover both income tax and self-employment tax.
Tax deductions are straightforward once you build tracking systems. Start with the big categories, COGS, platform fees, shipping, mileage, and home office, which likely represent 80% of your deductions. Then add the smaller categories as your record-keeping improves.
Set up a simple spreadsheet or use accounting software to track expenses by category throughout the year. When tax time arrives, you'll have everything organized instead of scrambling through receipts.
Consider working with a CPA or tax professional who understands ecommerce businesses. The cost is deductible, and they often identify deductions that more than cover their fees.
Every dollar you legitimately deduct is roughly 25-40 cents back in your pocket, depending on your tax bracket. For a full-time reseller with $50,000 in gross sales, properly tracked deductions can mean thousands of dollars in tax savings each year.
