Mercari issues a Form 1099-K when your sales on the platform exceed $20,000 in gross payments and cross more than 200 transactions in a single calendar year. The form reports the total gross amount Mercari processed for you, not what you actually earned. Your job at tax time is to reconcile that gross figure against your own records, subtract legitimate expenses, and report the net result.
When Mercari Sends the Form
Two conditions must both be met before Mercari is required to send you a 1099-K for the year:
- Gross payments exceed $20,000
- Total transactions exceed 200
If you receive $25,000 across 150 transactions, no form. If you complete 250 transactions totaling $15,000, still no form. The threshold reverted to these pre-2021 levels permanently under the One, Big, Beautiful Bill Act signed in 2025, wiping out the phased $5,000 threshold the IRS had previously announced for 2024.1Internal Revenue Service. IRS Issues FAQs on Form 1099-K Threshold Under the One, Big, Beautiful Bill; Dollar Limit Reverts to $20,000
The threshold decides only whether a form gets filed. It does not decide whether you owe tax. Every dollar of profit from Mercari sales is taxable whether or not a 1099-K arrives.2Internal Revenue Service. IRS Revises and Updates Form 1099-K Frequently Asked Questions
State Thresholds Can Be Lower
Several states set their own 1099-K thresholds well below the federal one, some as low as $600 in gross payments with no minimum transaction count. If you live in one of those states, you can receive a 1099-K from Mercari while sitting nowhere near the federal cutoff. Check your state revenue department’s site for the specific rule that applies to you.
What the Gross Number Actually Includes
Box 1a on the 1099-K shows the total gross amount of all reportable payment transactions Mercari settled for you during the year.3Internal Revenue Service. Understanding Your Form 1099-K That number is not adjusted. It rolls in the item sale price, any buyer-paid shipping, and sales tax collected. It also includes Mercari’s selling fee and payment processing fee, money that went from the buyer straight to Mercari and never touched your account. The IRS knows the figure is inflated relative to what you earned. What they want to see is that you properly account for the gap on your return.4Internal Revenue Service. What to Do With Form 1099-K
Turning Gross Payments Into Taxable Profit
If you sell on Mercari for profit, you report income and expenses on Schedule C (Form 1040), and only the net profit is taxed.5Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship) Common deductions for Mercari sellers include:
- Cost of goods sold, meaning what you paid to acquire the items you resold, plus materials and supplies
- Mercari’s selling fee and payment processing fee
- Postage, packing materials, and shipping labels you paid for
- Storage space, mileage for sourcing inventory, and similar overhead
Skipping these deductions is one of the costliest mistakes a Mercari seller can make. If Mercari reports $22,000 in gross payments and you spent $8,000 on inventory plus $3,000 on fees and shipping, your taxable profit is $11,000, not $22,000. Ignoring those costs means paying income tax on money that never reached you.4Internal Revenue Service. What to Do With Form 1099-K
If You’re Just Selling Old Personal Stuff
Many Mercari sellers are not running a business. They’re cleaning out a closet and selling used clothes, electronics, or furniture for less than they originally paid. Selling a jacket you bought for $120 for $40 is a personal loss, not income, and the IRS does not tax it.
The awkwardness comes when those sales end up on a 1099-K. The IRS recommends reporting the sale price in the entry space at the top of Schedule 1 (Form 1040) as other income, then entering an equal offsetting adjustment to zero it out, describing both entries as “Form 1099-K Personal Item Sold at a Loss.” Losses on personal property are not deductible, so the adjustment can never exceed the sale price even if you lost more than that in real terms.6Internal Revenue Service. Form 1099-K FAQs: Common Situations These transactions can also be reported on Form 8949 with code “L” in column (f) and the loss entered as a positive number in column (g), so the gain or loss column comes out to zero.7Internal Revenue Service. Frequently Asked Questions About Form 1099-K
Getting the Form and Fixing Errors
Mercari must deliver Form 1099-K to qualifying sellers by January 31 of the year after the transactions.3Internal Revenue Service. Understanding Your Form 1099-K The Tax Center in your Mercari account settings lets you choose electronic or paper delivery. Electronic forms appear as a downloadable PDF in your dashboard.
If the gross amount looks wrong, contact Mercari support and ask them to review your transaction history against the reported figure. A confirmed error gets a corrected form marked “Corrected.” Any change to your taxpayer identification number needs to be submitted by early January for the prior year’s form. Mercari’s obligation under federal law is limited to reporting the gross transaction data accurately; they won’t interpret the form or give tax advice.8Office of the Law Revision Counsel. 26 USC 6050W – Returns Relating to Payments Made in Settlement of Payment Card and Third Party Network Transactions If a corrected 1099-K arrives after you’ve already filed, you may need Form 1040-X to amend the return.9Internal Revenue Service. Amended Returns
Backup Withholding
If you haven’t given Mercari a valid taxpayer identification number through a W-9, or if the IRS tells Mercari that the TIN you provided doesn’t match its records, Mercari must withhold 24% of your gross payments and send it to the IRS. That’s backup withholding, and it stings because it’s calculated on the gross figure before any fees or costs come out.10Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide Mercari may also restrict transactions or payouts until you verify your identity. The fix is completing your W-9 information in your account settings as soon as you start selling. Amounts already withheld are claimed as a credit when you file your annual return.
Reporting Mercari Income With No 1099-K
Falling below the reporting thresholds doesn’t make the income invisible, and it doesn’t make it tax-free. You still owe tax on your net profit.
Sole proprietors report Mercari income and expenses on Schedule C, and the net profit flows to Form 1040 as part of total income.11Internal Revenue Service. 2025 Instructions for Schedule C (Form 1040) If net self-employment earnings reach $400 or more, you also owe self-employment tax for Social Security and Medicare, calculated on Schedule SE.12Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) Mercari’s built-in sales reports show each transaction with sale price, fees charged, and net payout, which is the data you need to complete Schedule C even without a form.
Quarterly Estimated Tax Payments
Mercari income has no automatic withholding unless backup withholding applies. If you expect to owe $1,000 or more in federal tax for the year after subtracting withholding from other jobs and refundable credits, the IRS expects quarterly estimated tax payments.13Internal Revenue Service. Form 1040-ES Estimated Tax for Individuals (2026) Payments are due four times a year, typically in April, June, September, and January. Calculate the amount using Form 1040-ES and pay through IRS Direct Pay, EFTPS, or by mailing a check with a voucher. Missing deadlines triggers an underpayment penalty that accrues interest even if you settle the full balance at filing.
Records to Keep
The IRS specifically recommends keeping reports from payment apps and online marketplaces, payment receipts, and merchant statements to support the income and deductions you claim.4Internal Revenue Service. What to Do With Form 1099-K For Mercari, save transaction-level data showing each sale price, fees deducted, and net deposit. If you’re reselling, keep purchase receipts or invoices that document your cost of goods. Shipping receipts, packing supply purchases, and mileage logs for sourcing trips round out the file. Store everything for at least three years after filing, the standard IRS audit window for most returns.