Reseller Tax Guide 2026

Tax season catches a lot of resellers off guard — not because the rules are impossibly complex, but because nobody explained them clearly when they started flipping. You sold $40,000 in stuff on eBay last year, your 1099-K shows $40,000, and now you're wondering if you owe taxes on all of it. The short answer: not all of it, but you do owe some of it, and you need to know the difference before you spend what should have gone to the IRS.

When Do You Owe Taxes as a Reseller?

The IRS considers reselling a business activity once you're doing it with profit intent and regularity. Even if you haven't formally registered a business, if you're buying and selling for profit — on eBay, Poshmark, Depop, Mercari, Facebook Marketplace, or anywhere else — the income is taxable.

For 2026, the 1099-K reporting threshold from platforms like eBay, PayPal, and Venmo is $600 in gross payments. This is a lower threshold than in prior years, meaning more resellers will receive 1099-Ks. But here's what many sellers get wrong: you owe taxes whether or not you receive a 1099-K. The 1099-K is an information form — it tells the IRS what you received. It doesn't determine your tax liability. That's determined by your profit, not your gross receipts.

Critical Distinction Your 1099-K shows gross sales — the total payments you received. Your taxable income is your net profit: gross sales minus your cost of goods, platform fees, shipping, and all other legitimate deductions. These are very different numbers.

What Counts as Income

All money you receive from reselling activity counts as gross income — not just what you were 1099'd for. If you sold $3,000 on Facebook Marketplace and received cash and Venmo payments that weren't captured on a 1099-K, that income is still reportable. The IRS doesn't limit your obligation to what forms you receive.

This includes income from:

• Online platforms (eBay, Poshmark, Mercari, Depop, StockX, GOAT)
• Facebook Marketplace and in-person cash sales
• Consignment or brokered sales where you received a cut
• Lot sales to other resellers

It does not include: selling personal property for less than you paid (a loss, not a gain), gifts, or insurance reimbursements unrelated to reselling activity.

What You Can Deduct

This is where most resellers leave money on the table. The deductions available to a reselling business are substantial — but they need to be documented. Here are the main categories:

Keep records for everything. A $4,000 COGS reduction at a 25% income tax rate is $1,000 less in tax. The documentation discipline pays for itself within the first major purchase receipt you keep.

How Self-Employment Tax Works

This is the piece most new resellers don't anticipate. If you're operating as a sole proprietor (which is the default if you haven't set up an LLC or corporation), your net business profit is subject to self-employment (SE) tax in addition to income tax.

Self-employment tax covers Social Security and Medicare. The rate is 15.3%, but it's applied to 92.35% of your net profit — not the full amount. That 7.65% reduction accounts for the "employer" portion that would normally be paid separately in a traditional job.

The SE Tax Deduction

Here's a small but real benefit: you can deduct half of your SE tax from your gross income when calculating your income tax. In the example above, that's $2,119 knocked off your AGI before your marginal income tax rate is applied. It doesn't eliminate the SE tax — you still pay it — but it reduces the income tax calculation on top.

Quarterly Estimated Tax Payments

If you expect to owe more than $1,000 in federal taxes for the year, the IRS requires you to make quarterly estimated tax payments. Resellers who don't withhold from a paycheck and have significant selling income should almost always be making these payments to avoid underpayment penalties.

A practical approach: set aside 25–30% of every net profit dollar as it comes in, in a separate savings account. This covers both SE tax and income tax for most resellers in middle income brackets. If your business is profitable and growing, err toward 30%.

Record Keeping: What to Save

The IRS recommends keeping business records for a minimum of 3 years from the date you file (or 6 years if you underreported income by more than 25%). For a reselling business, the key records to maintain are:

• Purchase receipts for every item you buy for resale — thrift store receipts, garage sale notes, estate sale invoices
• Mileage log with date, destination, purpose, and miles driven for every business trip
• Platform statements showing gross sales, fees deducted, and payouts — downloadable from eBay, Poshmark, Mercari seller dashboards
• Shipping receipts or a carrier account history if you use Click-N-Ship or Pirateship
• Supply receipts for packaging materials, storage, and equipment
• Bank and PayPal statements showing all income received

If you can't prove a deduction with a receipt or log, it doesn't exist in an audit. The discipline of keeping records in real time is vastly easier than reconstructing a year's worth of purchases from memory in February.

Tax-Ready CSV Export from stokd

stokd tracks your COGS, platform fees, shipping costs, and sale prices on every transaction throughout the year. At tax time, you can export a full transaction CSV that breaks down gross sales, total deductible costs, and net profit per item — organized exactly how a CPA or tax software needs it. No spreadsheet archaeology, no trying to remember what you paid for that coat in March. The records are there because you logged them at the point of sale.