USPS Fuel Surcharge 2027: What Changes and What Doesn’t

USPS will start adding a fuel surcharge to four domestic package services in January 2027 — the first USPS fuel surcharge the agency has ever levied — and the percentage will be reset every week. If you mail letters, you can stop worrying here: First-Class Mail letters, large envelopes, postcards, and postage stamps are not part of the change, and there is no January 2027 rate increase for letter postage at all.

The details were published on October 26, 2026, in a Fuel Surcharge Implementation FAQ on USPS’s PostalPro site, and reported the same week by Supply Chain Dive and The Conveyor. Below is what is confirmed, what USPS has not said yet, and why none of it touches the stamps on your letters.

The Short Answer: What Changes and What Doesn’t

Service	Fuel surcharge from January 2027?	Tracks which fuel price
USPS Ground Advantage	Yes	Diesel
Parcel Select	Yes	Diesel
Priority Mail	Yes	Jet fuel
Priority Mail Express	Yes	Jet fuel
First-Class Mail letters	No	—
Large envelopes (flats)	No	—
Postcards	No	—
Marketing Mail and Periodicals	No	—
International mail	No — domestic shipments only	—

The distinction running through that table is the one that decides everything else. USPS sells two legally different categories of mail. The four services getting the surcharge are competitive products — the package services that compete with UPS and FedEx, which USPS can price more freely. Letters, flats, and postcards are market-dominant products, capped by a price formula overseen by the Postal Regulatory Commission. A fuel surcharge on a package is legal; the same surcharge on a one-ounce letter is not.

What USPS Actually Announced

The PostalPro FAQ sets out four mechanics:

• Scope. Domestic Priority Mail Express, Priority Mail, USPS Ground Advantage, and Parcel Select — for both retail and commercial shipments, including applicable return services.
• How it is calculated. As a percentage of base postage, excluding additional services and nonstandard fees.
• How often it moves. Weekly, up or down, following fuel prices published by the U.S. Energy Information Administration.
• How much notice. New percentages are published three to five days ahead for diesel-based services and three to four days ahead for jet-fuel-based services, delivered through USPS pricing and label APIs. USPS says historical data will be posted publicly.

USPS also confirmed that a package carrying an outdated surcharge amount is subject to postage due — postage and fees must be correct at the time of mailing. Shippers with negotiated contracts “may have customized language” governing whether and how the surcharge applies.

What USPS Has Not Said Yet

This is where budgeting gets hard, and it is worth being blunt about it. As of early November 2026, USPS has not published the starting percentage, the formula it will use, whether weekly changes will be subject to a floor or ceiling, or the exact January start date. The FAQ says only “January 2027.”

Question	USPS answer so far
Which services?	Confirmed: PME, Priority Mail, Ground Advantage, Parcel Select
How calculated?	Confirmed: percentage of base postage
How often?	Confirmed: weekly, both directions
Starting percentage?	Not published
Formula or caps?	Not published
Exact start date?	“January 2027” only
Does it replace the 8% increase?	Not stated

That last row matters. The temporary 8% transportation-related increase that took effect April 26, 2026 is scheduled to run through January 17, 2027, and the holiday peak period for those same services ends the same day — see our breakdown of USPS holiday peak pricing for 2026. Because USPS has dated the surcharge only to “January,” trade reporting notes a short window in early January 2027 where ground packages could carry both. Watch the Postal Explorer price change page for the official confirmation.

What Does NOT Change: Your Letters and Your Stamps

No January 2027 rate increase is coming for market-dominant mail, which includes First-Class Mail, Marketing Mail, and Periodicals — confirmed in industry advisories and consistent with what USPS has filed. We covered the reasoning in full in our article on the January 2027 rate decision; the short version is that the next letter-rate increase is expected in July 2027, with industry estimates in the 6–7% range.

That means the postage on a letter is fixed until at least mid-2027. These are the current stamped rates from Notice 123, effective October 4, 2026:

Mailpiece	Stamped (retail)	Metered / online
Letter, 1 oz	$0.82	$0.78
Letter, 2 oz	$1.11	$1.07
Letter, 3 oz	$1.40	$1.36
Letter, 3.5 oz	$1.69	$1.65
Large envelope (flat), 1 oz	$1.69	—
Postcard	$0.65	—
Nonmachinable surcharge	+$0.49	+$0.49

A Forever stamp bought today covers a one-ounce First-Class letter forever, at any future price. That is the whole point of the product, and it is why a variable, weekly-adjusted surcharge on packages does nothing to the 82¢ stamp already sitting in your drawer. For the long-run picture, see Forever stamps versus rising USPS rates and the full Forever stamp price history.

USPS Price Changes: 2026–2027 Timeline

Date	What changed	Affects letters?
January 18, 2026	Regular annual price change	Yes
March–April 2026	Temporary 8% transportation-related increase announced; took effect April 26	No — packages only
July 12, 2026	Forever stamp 78¢ → 82¢; metered 74¢ → 78¢; postcard 61¢ → 65¢	Yes
October 4, 2026	Notice 123 price list; holiday peak pricing begins	No — packages only
October 26, 2026	Fuel Surcharge Implementation FAQ published	No
January 2027 (date TBD)	Weekly fuel surcharge begins	No
January 17, 2027	8% temporary increase and holiday peak pricing expire	No
July 2027 (projected)	Next market-dominant increase; industry estimates 6–7%	Yes

What This Means If You Mail Letters

Practically: nothing on the letter side of your budget needs to change before July 2027. The more useful observation is that the variable-cost model USPS is now building for packages is a model letters will never have, because the law does not allow it. A stamp is a fixed, prepaid, price-locked unit of postage in a category where prices are capped and changes are announced months in advance.

That makes the arithmetic of buying stamps below face value unusually durable. On 1,000 one-ounce letters:

How the postage is paid	Cost per letter	1,000 letters
Face value at the Post Office	$0.82	$820.00
Metered or online postage	$0.78	$780.00
US Stamps Deals, 100-count	$0.25	$250.00
US Stamps Deals, 1,000-count	$0.20	$200.00
US Stamps Deals, 2,000-count	$0.15	$150.00

Those stamps do not expire and do not need a surcharge adjustment — and if letter rates rise in July 2027 as expected, stamps bought at today’s price simply cover more. Full methodology is in how much you can save on Forever stamps, and volume options are on the wholesale Forever stamps page.

If you also ship packages, budget differently: from January 2027 treat Ground Advantage and Priority Mail as having a variable line item you cannot forecast more than a week out. And if you are mailing anything heavy or thick with stamps rather than a label, the drop-off rules are stricter than most people think — see whether you can use stamps on a package.

Frequently Asked Questions

Does the USPS fuel surcharge apply to Forever stamps?

No. The surcharge applies only to domestic Priority Mail Express, Priority Mail, USPS Ground Advantage, and Parcel Select. First-Class Mail letters, flats, and postcards are market-dominant products and are not included.

Is there a USPS rate increase in January 2027?

Not for letters. USPS is not implementing a January 2027 increase for market-dominant mail, which includes First-Class Mail. The next letter-rate change is expected in July 2027.

How much will the fuel surcharge be?

USPS has not published the starting percentage, the formula, or any minimum or maximum. It has said only that the surcharge is calculated as a percentage of base postage, excluding extra services and nonstandard fees, and that new percentages will be published three to five days before they take effect.

How often will the surcharge change?

Weekly, in either direction, tracking diesel prices for Ground Advantage and Parcel Select and jet fuel prices for Priority Mail and Priority Mail Express, based on U.S. Energy Information Administration data.

Does it apply to international packages?

No. USPS has specified that the fuel surcharge covers domestic shipments only.

What happens if I mail a package at the old surcharge amount?

USPS has confirmed the piece will be subject to postage due. Postage and fees must be correct at the time of mailing.

Does the surcharge replace the temporary 8% increase?

USPS has not said. The 8% increase and the holiday peak pricing both expire January 17, 2027, while the surcharge is dated only to “January 2027,” so a brief overlap is possible. Check the Postal Explorer price change page for the official terms.

The Bottom Line

USPS is importing private-carrier pricing habits into its package business, and that means a variable fuel line from January 2027. Letters stay on the old model: capped rates, announced changes, and stamps that never need topping up. If your mail is mostly letters, this change is noise — and if you are stocking up before the projected July 2027 increase, now is the calm part of the cycle.

Start with wholesale Forever stamps or Christmas stamps for holiday cards, check how many Forever stamps you need for the season ahead, and read Christmas card postage for 2026 before the December rush. If mail volume is part of your business, the fee table in our Certified Mail guide shows where stamps do and do not help.

Details reflect the USPS fuel surcharge guidance published October 26, 2026, and Notice 123 effective October 4, 2026, checked November 3, 2026. USPS has not yet announced the starting percentage or the exact January 2027 start date; this page will be updated when it does.