For years, the answer was a reliable yes, so most teams stopped checking. USPS pricing changed four times in 2026, and alternative carriers kept expanding, meaning the answer now depends on the package rather than the carrier. Getting to it requires comparing total delivered cost, not base rates. Base rate comparisons favor whichever carrier publishes the leanest headline number, and that is rarely the carrier that bills the least at the end of the month.
If the package weighed less than a pound, it went to USPS, and the decision was not given another thought. That default held for a long time because it was usually right.
It is no longer automatic. What has changed is not that USPS became expensive, but that the answer now varies by package. Two carriers can serve the same delivery, and which one costs less depends on the zone, the weight, the dimensions, and the fees each carrier attaches. Getting that answer requires a specific kind of comparison, and most teams are not running it.
USPS changed pricing four times, which is part of why the old assumption stopped holding. Rates rose in January, a temporary increase took effect in April, structural changes arrived in July, and peak-season pricing begins in October.
Two of those changed the economics of packages under one pound. On July 12, USPS eliminated ounce-based rate differentiation for published Commercial USPS Ground Advantage prices and aligned its dimensional weight divisor with industry standards, both announced in the May 11 filing notice to the Postal Regulatory Commission. The first applies only to published Commercial rates, so negotiated Commercial and retail prices were untouched. The second raises billable weight on boxes over one cubic foot regardless of what is inside them.
The other two raise what you pay regardless of package size. The January increase lifted USPS Ground Advantage by roughly 7.8 percent on average. A “temporary” increase then took effect in April and runs through Jan. 17, 2027, and the peak-season increase begins Oct. 4 and expires on that same date. Our breakdown of the 2026–27 peak season increase covers what it costs by zone and weight.
The news is the easy part. What to do with it is harder.
Carriers publish base rates because base rates are comparable. They are also incomplete. The cost on your invoice is the base rate plus the fees that apply to that specific delivery, which differ enormously by carrier.
USPS Ground Advantage carries no residential delivery surcharge. Saturday delivery is included, and so is basic insurance. USPS reaches more addresses than any other carrier, which means fewer packages fall into the extended or remote pricing that other carriers apply to hard-to-serve ZIP codes.
A competing carrier can publish a lower base rate on the same package and still bill more after residential, fuel, and delivery-area surcharges are added. That is not a trick. It reflects a different cost structure, in which the base rate carries less of the total and the accessorials carry more. Compare only the base rates, and you will systematically pick the carrier with the most aggressive fee schedule.
For each carrier under consideration, price a package all the way through:
Fuel is where the asymmetry between carriers is largest. USPS does not assess a fuel surcharge on Ground Advantage, because transportation costs are built into the published rate. USPS has raised rates in response to those costs, including the temporary increase that took effect in April 2026, but a rate change is not the same as a percentage applied to every shipment.
Most competing carriers do assess fuel that way, against the base rate and many of the accessorials stacked on top of it, at a percentage that adjusts weekly against published fuel indexes. On those carriers, fuel scales with every dollar the other surcharges add, and it moves between the day you build the comparison and the day you ship. Use current percentages rather than a quarterly average, and price the same package under a high-fuel week to see how much of the gap is fuel-driven.
A regional carrier with dense coverage in its home territory can beat USPS decisively on short-zone residential deliveries but lose badly on the same package in a different zone. Weight ranges behave the same way, with the crossover point sitting at a different place for each carrier.
Segment your volume by zone, weight range, and package dimensions before you price anything. Then price each segment against every carrier that serves it. What comes back is rarely a winner. It is a map of which carrier wins where, and that map is what a working carrier mix is built from. A carrier that costs more across your entire book can still be the least expensive option for a weight range in one set of zones, and that segment may represent a large share of your volume.
Run it again whenever something in the calculation changes. A fuel percentage, a new surcharge, packaging that has grown, a change in where your customers are concentrated, or a rate action from any carrier in your mix will each move the crossover points. Peak season moves several at once, which is why it belongs in the model as its own scenario rather than an adjustment to an annual average.
TransImpact models this comparison against your own shipment data across every zone, weight range, and surcharge, at peak and off-peak. Request a demo to see where your current carrier mix wins and where it does not.
For many packages, yes. USPS remains strong for residential delivery, particularly outside a regional carrier's footprint. What has changed is that the answer varies by package rather than applying across your whole operation, so it needs to be verified by segment rather than assumed.
Base rates exclude the fees that decide the outcome. USPS Ground Advantage has no residential surcharge and includes Saturday delivery and basic insurance. A competing quote may add residential, delivery area, and fuel charges on top of a lower headline rate.
Segment your volume by zone, weight range, and dimensions. Price a representative package in each segment on every applicable charge, including dimensional weight, residential and delivery-area surcharges, fuel, and peak surcharges for the weeks they apply. Then compare them by segment rather than in aggregate.
No. Splitting volume by segment, using USPS where it wins and an alternative carrier where its network performs best, generally produces a better blended cost than committing everything to a single carrier.
At minimum, before peak and after any carrier rate action. Carriers that assess a fuel surcharge adjust the percentage weekly, so those comparisons go stale fastest. Changes to your packaging or to where your customers are concentrated will also change the results.