Small parcelCost guide3 min read

U.S. Priority Mail Flat Rate Retail vs. Commercial Prices, Oct. 2026–Jan. 2027

From Oct. 4, 2026 through Jan. 17, 2027, published U.S. retail-to-commercial postage gaps are $1.70 for Small, $3.78 for Medium and $3.35 for Large Priority Mail Flat Rate boxes.

By BoslogShip ResearchReviewed by BoslogShip Editorial ReviewPublished October 27, 2026

U.S. Priority Mail Flat Rate Retail vs. Commercial Prices, Oct. 2026–Jan. 2027 cover visual

Published U.S. Priority Mail Flat Rate postage is $14.65 retail versus $12.95 commercial for Small, $25.80 versus $22.02 for Medium and $36.10 versus $32.75 for Large boxes.

For published U.S. Priority Mail Flat Rate postage, retail minus commercial is $1.70 for Small, $3.78 for Medium and $3.35 for Large during the Oct. 4, 2026–Jan. 17, 2027 window. Medium has the largest dollar gap among these three box comparisons.^[1]

Published U.S. box prices and differences

Source[1]

Published U.S. Priority Mail Flat Rate box postage in USD, effective Oct. 4, 2026 through Jan. 17, 2027.^[1]
Flat Rate box	Published retail postage	Published commercial postage	Retail minus commercial
Small	$14.65	$12.95	$1.70^[1]
Medium	$25.80	$22.02	$3.78^[1]
Large	$36.10	$32.75	$3.35^[1]

The comparison is box-specific: each difference subtracts the published commercial amount from the published retail amount for the same Flat Rate box and effective period.^[1]

What the U.S. published-postage comparison does not establish

Source[1]

The supplied comparison does not establish shipment eligibility for the separately listed Priority Mail Flat Rate box prices. The supplied U.S. domestic sample also does not infer negotiated prices, extra fees or delivery commitments.^[1]

Use the comparison for a purchase decision

Select the Flat Rate box type you intend to use.
Confirm that the shipment and packaging satisfy the applicable requirements.
Check the amount presented by your available commercial purchase channel for that box.
Compare the final purchase amount with the retail alternative, including any additional amount presented before payment.
Base the final choice on the verified purchase amounts rather than on the published gap alone.

For a purchase outside the stated window, obtain the then-applicable published amounts before making the same comparison.

Sources and evidence

1 source

Each source is tied to a visible claim in the article. Access dates show when BoslogShip last verified the cited page.

[1]
Official primary source · United States Postal Service
Final U.S. USPS domestic parcel postage: retail and commercial sample
Published September 18, 2026 · Accessed October 27, 2026
- Supports: The official final U.S. USPS domestic published postage sample is effective from Oct. 4, 2026 through Jan. 17, 2027.
  Data as of 2026-10-27
- Supports: For the U.S. Priority Mail Small Flat Rate Box, published retail postage is $14.65 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: For the U.S. Priority Mail Small Flat Rate Box, published commercial postage is $12.95 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: For U.S. Priority Mail Medium Flat Rate Boxes, published retail postage is $25.80 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: For U.S. Priority Mail Medium Flat Rate Boxes, published commercial postage is $22.02 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: For U.S. Priority Mail Large Flat Rate Boxes, published retail postage is $36.10 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: For U.S. Priority Mail Large Flat Rate Boxes, published commercial postage is $32.75 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: The published U.S. retail-to-commercial postage difference for the Priority Mail Small Flat Rate Box is $1.70 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: The published U.S. retail-to-commercial postage difference for Priority Mail Medium Flat Rate Boxes is $3.78 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: The published U.S. retail-to-commercial postage difference for Priority Mail Large Flat Rate Boxes is $3.35 during the Oct. 4, 2026–Jan. 17, 2027 window.
  Data as of 2026-10-27
- Supports: The supplied U.S. published-postage comparison does not infer whether a shipment is eligible for the separately listed Priority Mail Flat Rate box postage.
  Data as of 2026-10-27
- Supports: The supplied U.S. domestic postage sample does not infer negotiated prices, extra fees or delivery commitments.
  Data as of 2026-10-27