USPS Final Time-Limited Price-Change Window for U.S. Operations: Oct. 4, 2026–Jan. 17, 2027

For U.S. operations, USPS labels the Time-Limited 2026 Price Change final and gives an effective period of Oct. 4, 2026, through Jan. 17, 2027.^[1]

For U.S. operations, the Excel price file, CSV price files, and Notice 123 PDF are each marked final and revised Sept. 18, 2026.^[1]

Separate the source-backed status and dates from operator-entered workflow decisions so that each calendar action can be reviewed independently.

1. Record the approved source artifact, its displayed status, its effective start and end dates, its revision date, and the date your team checked it.
2. Require an operator to confirm that the recorded status is final before treating the dates as an implementation window.
3. If the operator-entered operating date falls on or after the verified start date and on or before the verified end date, classify the calendar state as inside the window.
4. If the operator-entered operating date falls before the verified start date, classify the calendar state as pre-window; if it falls after the verified end date, classify it as post-window.
5. At an operator-selected lead time before the recorded end date, reopen the approved source and check for a revised status, replacement artifact, extension, or successor period.
6. On the recorded end date, repeat the source check before allowing the time-limited status to remain in any operating calendar.

• Use the status-and-date evidence only to manage the implementation calendar.
• Do not infer product-level applicability, rate amounts, shipment-level costs, or financial impact from this draft.
• Obtain separately approved evidence before changing product mappings, rate tables, customer charges, shipment rules, or financial forecasts.
• Pause implementation if the approved source no longer displays the recorded status, dates, artifact labels, or controlling revision.
• Document the owner, review lead time, approval path, and fallback behavior for the end-of-window check.