Mercari changed its US fee structure on January 6, 2025: sellers now pay a flat 10% selling fee on the combined item price + buyer-paid shipping. There’s no separate payment processing fee, no listing fee, and no monthly cost — just the 10%. Buyers pay an additional 3.6% Buyer Protection fee on their side, but that doesn’t affect what you receive.
The 10% is simple to forecast, but two seller-side costs still bite margins:
Sourcing cost — what you paid for the item, if you bought it to resell. Personal items from your own closet have a sourcing cost of zero; thrift-shop finds, eBay job-lots, wholesale clearance bundles all have real costs that need backing out before you know your real margin.
Promotional spending — Item Bump and Smart Pricing. Item Bump is optional and seller-paid (typically a few cents per bump); Smart Pricing automatically lowers your asking price toward your set floor — model the lower price as the sale price.
Packaging is the third silent cost. $0.30 per item across 100 items a year is $30 you didn’t account for. Most sellers don’t.
The Mercari seller’s two IRS questions
Two distinct questions, often confused:
1. Will Mercari issue me a 1099-K? Federal: yes if you cross $20,000 in sales AND 200 transactions in a calendar year. State thresholds vary widely — DC, MA, MD, VA, and VT trigger at $600; NJ at $1,000; AR at $2,500; most states match federal. The calculator above shows how close you are if you supply year-to-date totals; the 1099-K checker covers state-by-state thresholds in depth. Receiving a 1099-K is a reporting event, not a tax event.
2. Do I owe tax on what I make? Depends on whether what you’re doing is a trade or business. Selling old clothes from your own closet at a loss is not taxable income (it’s recovery of personal property at no profit). Buying items specifically to resell at a profit is self-employment and is taxable on net profit above $400 (the SE-tax filing floor). The self-employment tax calculator handles the marginal stacking on top of any W-2 wages.
The two questions answer separately. You can receive a 1099-K and owe nothing (a teenager clearing out three years of clothes in DC and crossing the $600 state threshold on personal-use items). You can owe tax and not be reported (a side-hustler doing 25 items at $60 each — under both federal thresholds but well over the $400 SE-tax floor). Run both calculators if you sell on Mercari regularly.
What the calculator above doesn’t model
A few cases where you’ll need to add math on top:
- Bundle discounts — work out the final agreed price per bundle and enter as one sale; the 10% fee applies to the combined total.
- Smart Pricing floor — if Smart Pricing reduced your sale price, enter the actual sold price (not the original list price). Always set your floor above the breakeven point including the 10% fee, your COGS, and packaging.
- Cross-border sales — Mercari US ships only to US addresses. International sales go through Mercari’s Japan platform with separate fee rules.
- Refunds — if you refund a sale, the 10% fee is also refunded; the math simply zeros out.
- Withdrawals — ACH direct deposit is free (1/day limit). Instant Pay is $3 per transfer. If you withdraw daily for small payouts, that’s $3 × frequent transfers eating into margin.
For the everyday “what do I actually keep on a $25 sale of an $8 thrift find” question, the calculator above is the answer.
Last verified: April 2026.