USPS adds a $50 fee for undeclared hazmat, and old labels on reused boxes trigger it
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USPS adds a $50 fee for undeclared hazmat, and old labels on reused boxes trigger it
Since July 12, 2026, USPS charges a $50 HAZMAT Noncompliance Fee on commercial-price competitive packages (Priority Mail Express, Priority Mail, Ground Advantage, Parcel Select and others) when it detects hazardous materials that weren't declared and labeled. Resellers most often get hit for reusing a box that still shows old hazmat markings. Notice 123 doesn't list the fee for Media Mail or for retail counter prices.
Your net on a $10 / $25 / $50 sale: n/a / n/a / n/a
A penalty, not a per-sale fee: $50 for each flagged commercial-label package. Mercari pays $25 of it (since Sept 1), and Poshmark pays none from Oct 19. eBay's Seller Center says you're charged the full $50.
Source: Federal Register 2026-09584 (USPS competitive price change) + USPS Notice 123 · verified
Cite this
The Reseller Index change tracker, "USPS adds a $50 fee for undeclared hazmat, and old labels on reused boxes trigger it," https://resellerindex.com/changes/usps/2026-07-12-usps-hazmat-noncompliance-fee/, verified Oct 14, 2026. Free to reuse with a link (CC BY 4.0).
More USPS changes
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- Light parcels hit hardest: commercial Ground Advantage drops its ounce tiers
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