Reseller Tax Guide 2026: What to Track, What to Deduct, and When to File

Taxes are the part of reselling that nobody wants to talk about but everybody needs to understand. The good news: if you're tracking your expenses properly, taxes on reselling income are manageable and often lower than you'd expect — because your deductible expenses offset a significant portion of your gross sales. The bad news: if you're not tracking anything, tax season becomes a nightmare of reconstructed receipts and guesswork.

This guide covers what you need to know for the 2026 tax year. Standard disclaimer: this is educational information, not tax advice. Your specific situation may vary, and a qualified tax professional is worth the investment once your reselling income exceeds a few thousand dollars per year.

The 1099-K Threshold: What Triggers Reporting

Platforms like eBay, Poshmark, and Mercari are required to send you (and the IRS) a 1099-K form if your gross sales on that platform exceed the reporting threshold. For the 2026 tax year, check the current IRS threshold — it has been changing in recent years as the IRS implements phased reductions. The threshold was originally dropped to $600 but implementation has been delayed and adjusted multiple times.

Regardless of the threshold, you are technically required to report all income, even if you don't receive a 1099-K. However, practically speaking, most part-time resellers only deal with tax implications once they cross the reporting threshold on at least one platform.

What's Deductible: The Reseller's Expense List

Every legitimate business expense you incur while reselling reduces your taxable income. Here's what qualifies:

Cost of Goods Sold (COGS)

This is the amount you paid for every item you sold. That $5 jacket you bought at Goodwill and sold for $35? The $5 is your cost of goods sold and is fully deductible against the $35 revenue. This is typically your largest deduction and the reason reselling taxes aren't as scary as they seem.

How to track it: Save every receipt. If the thrift store receipt doesn't itemize (many just show "Merchandise — $5.00"), take a photo of the receipt alongside the items you bought and note what each item cost. A simple spreadsheet works: date, store, item description, cost. Do this consistently and tax time is painless.

Platform fees

Every fee charged by eBay, Poshmark, Mercari, Depop, Etsy, or any other selling platform is deductible. This includes listing fees, final value fees, promoted listing fees, payment processing fees, and subscription fees (like an eBay Store subscription). Platforms provide annual fee summaries — download them in January.

Shipping costs

All shipping expenses are deductible: postage, shipping labels purchased through platforms, carrier pickups, and any shipping insurance you purchase. If you're buying postage through eBay or Pirate Ship, your annual reports will itemize this for you.

Shipping supplies

Poly mailers, boxes, tape, tissue paper, bubble wrap, labels, printer ink for labels, and any other packing materials. These are typically small amounts but add up over a year. Save receipts from your Amazon or Uline supply orders.

Mileage

This is the deduction most resellers miss. Every mile you drive to source inventory (thrift stores, garage sales, estate sales) and to ship packages (post office, UPS, FedEx) is deductible at the IRS standard mileage rate. For 2026, check the current rate — it's typically around $0.67–$0.70 per mile.

A typical weekly routine might include 30 miles of sourcing trips and 10 miles of shipping runs. That's 40 miles per week, roughly 2,000 miles per year, which translates to approximately $1,340–$1,400 in deductions. This is real money that directly reduces your tax bill.

How to track it: Use a free mileage tracking app (Stride, MileIQ, or even a simple note in your phone). Log the date, starting point, destination, and purpose ("sourcing at Goodwill" or "post office drop-off") for every trip. The IRS requires contemporaneous records — you can't reconstruct this at the end of the year.

Home office deduction

If you have a dedicated space in your home that you use exclusively and regularly for your reselling business — a spare room used as a photography studio and inventory storage, for example — you may qualify for the home office deduction. The simplified method allows $5 per square foot up to 300 square feet ($1,500 maximum). A 100-square-foot spare room used as your reselling workspace would be a $500 deduction.

Phone and internet

The business-use percentage of your phone bill and internet service is deductible. If you estimate that 30% of your phone use is for reselling (checking comps, responding to buyer messages, photographing items), then 30% of your annual phone bill is deductible. Be reasonable with your estimates — the IRS doesn't expect 100% business use of a personal phone.

Tools and equipment

A thermal printer, a photography light, a mannequin, a fabric steamer, a kitchen scale for weighing packages, a clothing rack, storage shelving — any equipment purchased for your reselling business is deductible. Items under $2,500 can be fully deducted in the year purchased. Keep receipts.

Software and subscriptions

Cross-listing tools (Vendoo, List Perfectly), inventory management apps, accounting software, and any other business-related subscriptions are deductible.

In this example, $8,000 in gross sales results in only $940 of taxable income after legitimate deductions. At a 22% tax bracket, that's roughly $207 in federal income tax plus approximately $133 in self-employment tax — a total tax bill of about $340 on $8,000 in gross sales. Without tracking deductions, the tax bill on $8,000 would be closer to $2,500+.

Self-Employment Tax: The Extra Bite

Reselling income is self-employment income, which means you pay self-employment tax (Social Security and Medicare) in addition to regular income tax. The self-employment tax rate is 15.3% on net self-employment income, though you can deduct half of it on your income tax return.

This is the tax that surprises people. Even if your income tax rate is low, self-employment tax adds 15.3% on top. This is why tracking every deduction matters — every dollar of deductible expense reduces both your income tax and your self-employment tax.

Quarterly Estimated Taxes

If you expect to owe more than $1,000 in taxes for the year, the IRS wants you to pay quarterly estimated taxes rather than one lump sum in April. The due dates are typically April 15, June 15, September 15, and January 15 of the following year.

For most part-time resellers in their first year, quarterly payments aren't necessary — your withholdings from a W-2 job usually cover the additional tax liability. But if reselling becomes your primary income or if your W-2 withholdings don't cover the extra, set aside 25–30% of your net profit each quarter for taxes.

State Sales Tax: The Complicated Part

Sales tax on resale transactions varies by state and by platform. Most major platforms (eBay, Poshmark, Mercari) now collect and remit sales tax automatically on behalf of sellers in states that require it. This means you generally don't need to worry about collecting sales tax — the platform handles it.

However, some states require sellers to have a sales tax permit or resale certificate even if the platform collects tax. Check your state's Department of Revenue website or consult a tax professional if you're unsure.

When to Get an Accountant

For most part-time resellers earning under $5,000/year in net profit, self-filing with tax software (TurboTax Self-Employed, FreeTaxUSA, or similar) is perfectly adequate. The forms involved (Schedule C for business income, Schedule SE for self-employment tax) are straightforward once you've done them once.

Consider hiring a tax professional when: your net reselling income exceeds $10,000/year, you're unsure about state-specific requirements, you have a complex tax situation with multiple income sources, or you want to optimize your deductions beyond what you can figure out on your own. A good tax preparer costs $200–$500 and often saves you more than their fee in missed deductions.

For a practical look at what these numbers look like in the real world, check out our 90-day financial breakdown — it shows actual sourcing costs, fees, and profits from a real part-time reselling operation.