Essential guide to December 2025 Amazon seller updates. Learn what's changing and how to adjust your fulfillment strategy.
Amazon's December 2025 updates brought critical changes for FBA sellers, from extended holiday cutoffs to peak fees lingering until Jan 14, 2026, and USPS proof-of-shipment shifts hitting FBM hard. Don't miss the extended returns through Jan 31—brace for Q1 cash flow hits and inventory risks like auto-liquidations.
Key Dates
Dec 23, 2025: Final FBA/Seller-Fulfilled Prime cutoff for holiday delivery.
Dec 24, 2025: USPS postmark rules tighten, switch to pickup scans for FBM proof.
Jan 14, 2026: Peak fees end; recalculate margins immediately.
Jan 31, 2026: Holiday returns deadline.
Hidden Traps
Liquidation/donation defaults can wipe out aged stock without warning—review settings now. Bundling enforcement is stricter; undocumented kits risk suppression and forced disposal. DSP keyword targeting shines for mid-funnel ads but demands tight ROAS monitoring to avoid budget burns.
Action Plan
Sweep dispositions: Remove, reprice, or liquidate aged inventory in 48-72 hours.
Harden FBM proofs: Mandate carrier scans over drop-off slips.
Audit bundles: Fix packaging/LOA gaps or pause listings.
Control dispositions, proofs, and proofs now. January's hangover is real. Full briefing: Amazon 2025 December updates












