Seller Tax Guide
Mercari Taxes: What Every Seller Needs to Know
Whether Mercari is taxable depends on whether you're selling off your own things or running a resale business. Mercari doesn't withhold taxes, and the 1099-K it may send reports gross sales, not profit. Here's how Mercari taxes work once you're selling as a business.
How Mercari taxes work
You're a self-employed seller
The marketplace doesn't withhold taxes. If you sell as a business (regularly and for profit), you owe income tax plus self-employment tax on your net profit — what's left after the cost of the goods and your selling expenses.
Self-employment tax is 15.3%
That's 12.4% Social Security + 2.9% Medicare on your net earnings — on top of regular income tax. It funds the benefits an employer would normally split with you.
Deductions lower your taxable income
Business expenses — equipment, software, supplies, and phone — reduce the net earnings you're taxed on. Tracked properly, they often save more than any other single move.
You pay as you go, quarterly
Instead of one April bill, the IRS expects estimated payments four times a year. Paying quarterly avoids an underpayment penalty.
Do you get a 1099-K — and is your Mercari income taxable?
Mercari processes buyer payments, so it issues a Form 1099-K when your sales reach the IRS reporting threshold for the year. That threshold has changed in recent years, so you might receive a 1099-K for modest sales — or not get one and still owe tax. It reports gross sales before fees and shipping, so it isn't your taxable profit.
Whether you owe tax depends on what you're doing. Selling your own used items for less than you paid is generally not taxable (and the loss isn't deductible). But buying to resell for profit is a business: you report it on Schedule C, deduct your cost of goods and expenses, and owe income tax plus the 15.3% self-employment tax on the net profit. Confirm your situation with the IRS.
What Mercari sellers can deduct
Cost of goods sold (COGS)
What you paid for the items you resold is subtracted from your sales as COGS — keep records of each item's cost.
Mercari selling & processing fees
Mercari's selling fee and payment-processing fee are deductible business expenses.
Shipping (if you cover it)
Any postage or shipping you pay rather than pass to the buyer is deductible.
Packaging & supplies
Boxes, mailers, tape, and packing materials used to ship orders.
Home office & storage
The part of your home used regularly and exclusively to store inventory or run the business may qualify.
Sourcing mileage
Miles driven to source inventory are deductible at the IRS standard mileage rate.
Frequently asked questions
Does Mercari take out taxes for me?
No. Mercari doesn't withhold taxes. If you sell as a business, you owe income tax plus the 15.3% self-employment tax on your net profit (sales minus cost of goods and expenses).
Do I get a 1099-K from Mercari?
Mercari issues a 1099-K when your sales reach the IRS reporting threshold for the year (the threshold has changed recently). It reports gross sales before fees — report all of your business income whether or not a form arrives.
Is selling on Mercari taxable income?
Reselling for profit is a taxable business on Schedule C. Selling your own used belongings for less than you paid generally isn't taxable, and that loss isn't deductible. A 1099-K alone doesn't make income taxable — but you must report and reconcile it. Confirm with the IRS.
What can Mercari sellers deduct?
Your cost of goods (what you paid for items), Mercari's fees, any shipping you cover, packaging, a qualifying home office or storage, and sourcing mileage. Records of each item's cost are essential.
How much should Mercari sellers set aside for taxes?
A common rule of thumb is 25–30% of your net profit (sales minus cost of goods and expenses) for income tax plus the 15.3% self-employment tax — your exact rate depends on your total income and state. Use the Tax Set-Aside calculator for a tailored number.
Authoritative IRS resources
Free calculators for Mercari sellers
Stop guessing what you owe
UnifyOne tracks your online reselling earnings, expenses, and tax set-aside automatically — so quarterly taxes are never a surprise.
This guide is educational information, not tax advice. Tax rules, thresholds, and the IRS standard mileage rate change yearly — confirm current figures with the IRS or a qualified tax professional for your situation.