Know your net.
Fees, postage and platform rules change every month. We track every change from the official source and show what it does to your take-home on a $10, $25 and $50 sale.
Get the weekly Index
What changed in fees, postage and rules this week, and what it costs you on a $10, $25 and $50 sale. Free, one email every Thursday.
- The weekly Index: one email every Thursday: what changed, what it costs you, what to do.
- The change tracker: 56 fee, postage, policy and tax changes so far, each dated and linked to its source.
- Free calculators: net payout on 8 platforms, Media Mail vs Ground Advantage, and a minimum-price builder.
Rates verified on
What it costs to sell a $25 item
Run your own item →The Reseller Cost Index, October 2026. Platform fees only, US seller, no shipping charged, no sales tax. Cheapest first.
| Platform | Fees | % of sale | You keep |
|---|---|---|---|
| Depop | $1.28 | 5.1% | $23.72 |
| TikTok Shop (most categories) | $1.50 | 6% | $23.50 |
| Mercari | $2.50 | 10% | $22.50 |
| Etsy | $2.83 | 11.3% | $22.17 |
| Whatnot (standard tier) | $3.03 | 12.1% | $21.97 |
| eBay (most categories) | $3.80 | 15.2% | $21.20 |
| eBay (books, movies, music) | $4.23 | 16.9% | $20.77 |
| Poshmark | $5.00 | 20% | $20.00 |
| Amazon (media, you ship) | $5.55 | 22.2% | $19.45 |
Latest changes
All changes →-
Whatnot will bill sellers for USPS weight adjustments from Nov 4
For US shipments sent on or after November 4, 2026, USPS charges for packages that weigh more than their Whatnot-generated label go to the seller's Whatnot ledger. Until now Whatnot absorbed them. For now Whatnot still covers dimension and hazmat adjustments, and it doesn't pass on UPS adjustments yet. Sellers whose first sale was on or after Sept 5, 2026 aren't part of this rollout, and neither are sellers who use their own labels.
Your net on a $10 / $25 / $50 sale: n/a / n/a / n/a
Not a set fee. You pay USPS's charge only when the packed box weighs more than the label says. To avoid it, weigh the packed box and fix the shipping profile before you buy the label. You have 45 days to appeal a charge, and USPS decides the appeal.
Source: Whatnot help: Review and appeal carrier adjustments · verified
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Whatnot Premier Shops lose their 10% commission discount on Nov 1
Until October 31, 2026, Whatnot cuts a Premier Shop's commission by a relative 10%, so 8% becomes 7.2%. Starting November 1 that discount goes away, and the rate depends only on the seller's four-week sales tier. Premier Shops keep the badge, the extra visibility in search and priority support. Qualifying still takes $50,000 in sales, 250 orders and 10 shows in 90 days.
Your net on a $10 / $25 / $50 sale: -$0.08 / -$0.20 / -$0.40
Premier Shop sellers only. A Tier 1 fashion Premier Shop going from 6.3% back to 7% keeps $0.07, $0.17 and $0.35 less; at the standard 8% tier (7.2% with the discount) it's $0.08, $0.20 and $0.40. Payment processing (2.9% + $0.30) is unchanged.
Source: Whatnot help: Premier Shop Program · Whatnot: Seller fees (tiers) · verified
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Poshmark will charge you for heavy packages shipped without an upgraded label
From October 26, 2026, if you ship a package over 5 lb on the standard label without upgrading it, Poshmark takes the upgrade cost from your earnings. Poshmark used to absorb this cost. The upgrade is $5.00 for 5.01-10 lb and $10.00 for 10.01-15 lb. A package over 15 lb on one label costs $15.00 at 15.01-25 lb, or the full USPS price over 25 lb.
Your net on a $10 / $25 / $50 sale: n/a / n/a / n/a
Only if you ship over 5 lb without upgrading: -$5.00 (5.01-10 lb), -$10.00 (10.01-15 lb), -$15.00 (15.01-25 lb on one label). Upgrading first costs the same and avoids a surprise deduction.
Source: Poshmark Blog, Oct 8, 2026 · verified
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Mercari Media Mail labels get cheaper: 1 lb $4.99 to $4.47
From October 19, 2026, Mercari's prepaid Media Mail labels cost $4.47 for 1 lb (was $4.99), $5.22 for 2 lb (was $5.99) and $5.97 for 3 lb (was $6.99). The new prices apply to new and existing listings, whether the buyer or the seller pays shipping. Even so, they're $0.08 to $0.11 above USPS's own Media Mail prices ($4.39 for 1 lb).
Your net on a $10 / $25 / $50 sale: +$0.52 / +$0.52 / +$0.52
If you pay for a 1 lb Mercari Media Mail label. 2 lb: +$0.77; 3 lb: +$1.02. If the buyer pays shipping, Mercari's 10% fee on shipping falls: +$0.05 on 1 lb (fees.js mercariFees).
Source: Mercari help: Fees on Mercari + Shipping change announcements (Sep 17, 2026) · verified
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Mercari Ground Advantage labels go up: 1 lb $7.48 to $7.99
From October 19, 2026, most Mercari prepaid USPS label prices go up for new and existing listings. At the Best rate, Ground Advantage goes from $4.91 to $5.39 at 4 oz, $7.48 to $7.99 at 1 lb and $12.83 to $13.99 at 3 lb, and Priority Mail 2 lb goes from $15.29 to $16.29. Standard rates (packages over 1 cu ft or longer than 22 in) rise more: Ground Advantage 1 lb goes from $7.59 to $8.99.
Your net on a $10 / $25 / $50 sale: -$0.51 / -$0.51 / -$0.51
If you pay for a 1 lb Best-rate Ground Advantage label. 4 oz Best: -$0.48; 3 lb Best: -$1.16; 1 lb Standard: -$1.40. If the buyer pays shipping, Mercari's 10% fee on shipping rises: -$0.05 on 1 lb (fees.js mercariFees).
Source: Mercari help: Fees on Mercari + Shipping change announcements (Sep 17, 2026) · verified
Calculators
Where do I net the most?
One item, every platform, ranked by profit.
Postage by weight
Media Mail vs Ground Advantage, current USPS prices.
Minimum-price builder
The lowest price that still clears your profit target.
eBay fees
13.6% of the total (15.3% for books, movies and music) + $0.30 or $0.40 per order
Mercari fees
10% of item price + buyer-paid shipping; no payment processing fee
Poshmark fees
$2.95 flat under $15; 20% at $15 and up
Depop fees
No selling fee for US sellers; 3.3% + $0.45 payment processing
Whatnot fees
8% commission on the item (standard tier) + 2.9% + $0.30 processing
Etsy fees
$0.20 listing + 6.5% transaction + 3% + $0.25 processing
Amazon (media, you ship) fees
15% referral on item + shipping, plus a $1.80 closing fee per media item
TikTok Shop fees
6% referral on item + buyer-paid shipping (5% pre-owned); no separate processing fee
How we work
Every number on this site comes from the platform's or carrier's own public page, with the date we checked it. The research and first drafts are AI-assisted, and a full-time reseller runs the site and edits every newsletter issue. If we get something wrong, it goes in the public corrections log.
One email a week. Every number sourced.
What changed in fees, postage and rules this week, and what it costs you on a $10, $25 and $50 sale. Free, one email every Thursday.