A 4 oz USPS package costs more in 2026 because three separate price changes landed on light parcels in one year. On July 12, 2026, USPS removed the ounce steps from Ground Advantage Commercial, so a 4 oz parcel now pays the same as a 15.999 oz parcel going to the same zone. Two time-limited increases, from April 26 and October 4, sit on top of that until January 17, 2027. Under Notice 123, effective October 4, 2026, a 4 oz Ground Advantage Commercial parcel is $7.34 to zone 2 and $8.95 to zone 8.

Why does a 4 oz package cost the same as a 15 oz package in 2026?

Because USPS stopped pricing Ground Advantage Commercial parcels by the ounce on July 12, 2026. Governors' Decision No. 26-2, published in the Federal Register on May 14, 2026, says "the ounce-based rate differentiation for USPS Ground Advantage Commercial will be eliminated" and puts the result at "an average price increase of 11.8 percent for USPS Ground Advantage Commercial." Retail prices did not change on that date.

Before July 12, the commercial list priced the 4, 8, 12 and 15.999 oz rows separately. Since then all four rows carry one price per zone, so a light parcel no longer gets a lower price than a 15 oz parcel. The 11.8 percent is an average across the whole product; USPS did not publish a figure for the 4 oz row alone.

Since July 12, the scale reading that matters on a commercial label is 1 lb, not 8 oz. USPS still lists four rows under 1 lb (4, 8, 12 and 15.999 oz), which Retail prices in two steps and Commercial at one price per zone; above 1 lb it prices by the pound with any fraction rounded up, so a 1.25 lb parcel is billed as 2 lb.

How much does it cost to ship a 4 oz package with USPS?

Under Notice 123, effective October 4, 2026, a 4 oz Ground Advantage parcel costs $7.34 to $8.95 at commercial prices and $8.55 to $10.20 at retail across zones 2, 5 and 8. These are USPS's published prices, checked on November 8, 2026. Retail is what the Post Office counter charges. Commercial is the USPS price list for Click-N-Ship, approved PC Postage products and other qualifying payment methods.

Weight (Notice 123 row)	Zone 2 Retail	Zone 2 Commercial	Zone 5 Retail	Zone 5 Commercial	Zone 8 Retail	Zone 8 Commercial
4 oz	$8.55	$7.34	$9.35	$8.24	$10.20	$8.95
8 oz	$8.55	$7.34	$9.35	$8.24	$10.20	$8.95
12 oz and 15.999 oz	$10.45	$7.34	$11.70	$8.24	$13.65	$8.95
1 lb	$10.45	$8.08	$11.70	$9.29	$13.65	$11.22
2 lb	$12.00	$8.48	$14.85	$10.50	$19.80	$13.42

Three things stand out. Retail still has a step between 8 oz and 12 oz; commercial has none until the parcel goes over 15.999 oz. At 4 oz, the commercial price in Notice 123, effective October 4, 2026, is $1.11 to $1.25 below retail in these zones. And distance moves a light commercial parcel more than weight does: in the same notice the 4 oz price rises $1.61 from zone 2 to zone 8, while going from 4 oz to 15.999 oz in one zone adds nothing.

Does the box change the price of a light parcel?

Only when the packaging pushes the packed weight over 15.999 oz; under Notice 123, effective October 4, 2026, that step can add more than $4 at zone 8. Below that line, a heavier mailer costs nothing extra on a commercial label.

Example (hypothetical item and packaging; USPS prices from Notice 123, effective October 4, 2026): a seller ships a 12 oz item on Ground Advantage Commercial and tries three ways to pack it.

Example packing	Packed weight	Row billed	Zone 2 Commercial	Zone 8 Commercial
Poly mailer	13 oz	15.999 oz	$7.34	$8.95
Padded mailer	15 oz	15.999 oz	$7.34	$8.95
Small box with filler	1 lb 3 oz	2 lb	$8.48	$13.42

The two mailers price the same. The box goes over 1 lb, the fraction rounds up to the 2 lb row, and the price in Notice 123, effective October 4, 2026, rises $1.14 at zone 2 and $4.47 at zone 8. Weigh the parcel as it ships, packaging included.

How much of a 4 oz label is the holiday increase?

Part of it, and that part is scheduled to end. USPS's August 25, 2026 announcement set temporary prices from October 4, 2026 until January 17, 2027. For Ground Advantage parcels from 0 to 3 lb, that October 4 change added $0.40 to commercial prices in zones 1 to 4 and $0.55 in zones 5 to 9, and $0.50 and $0.75 to retail prices in the same zone groups. USPS calls it a "temporary price adjustment", and the amounts are already inside the Notice 123 prices above rather than added as a separate line.

The October change is the last of four 2026 price events for Ground Advantage. Each filing gives its own end date, or none:

Effective date	What changed for Ground Advantage	Scheduled end
January 18, 2026	Average increase of 9.6 percent on Commercial and 5.9 percent on Retail	None given
April 26, 2026	Time-limited increase, 8.0 percent average on Retail and Commercial	January 17, 2027
July 12, 2026	Commercial ounce steps removed, 11.8 percent average on Commercial; Retail unchanged	None given
October 4, 2026	Temporary holiday prices, 6.0 percent average; parcels up to 3 lb rise $0.40 to $0.75	January 17, 2027

Sources: Governors' Decision No. 25-6 (Federal Register, November 19, 2025), PRC Docket CP2026-4, Governors' Decisions No. 26-2 and 26-7; checked November 8, 2026.

The April change is recorded in the Postal Regulatory Commission's notice for Docket No. CP2026-4, which says the prices "will roll back to current levels on January 17, 2027."

Will a 4 oz label cost less after January 17, 2027?

As of November 8, 2026, nobody can price it. The April and October filings both name January 17, 2027 as the date their increases end, and the October decision adds "unless the Governors take further action to adjust prices." The July 12 decision gives an effective date and no end date, unlike the other two. When we checked Postal Explorer on November 8, 2026, its "January 2027 Price Change" section listed only postage-statement redlines and a change log, both revised November 6, 2026, and no price list. Check the dated USPS price-change log before you reset shipping charges for January 2027.

What can a seller do about light-parcel postage?

Four things help on any USPS price list. None of them changes what USPS charges; they change which price you pay and who covers it.

Pick the service by weight and zone. A 4 oz parcel on Priority Mail Commercial bills at the 0.5 lb row: $9.72 to zone 2 and $16.07 to zone 8 in Notice 123, effective October 4, 2026, against $7.34 and $8.95 on Ground Advantage Commercial. In the same October 4, 2026 Notice 123, the smallest Ground Advantage Cubic tier is $7.91 to zone 2 and $10.68 to zone 8, also above the 4 oz weight price. The Ground Advantage rate guide lays out the weight and zone grid.
Choose flat or calculated shipping on purpose. With one commercial price per zone up to 15.999 oz, the buyer's distance drives your cost. A flat charge has to cover the far zones or you pay the gap; calculated shipping passes the zone through to the buyer. The trade-offs are in flat-rate vs weight-based shipping.
Pack to avoid USPS fees. Notice 123, effective October 4, 2026, adds $4.50 to a Ground Advantage Commercial parcel longer than 22 inches (up to 30), $4.50 for a tube or roll, and a $3.00 Dimension Noncompliance Fee when dimensions are missing or wrong. On a light item, one of those fees can cost more than the postage difference between two mailers.
Price the same box on UPS and FedEx. Other carriers price a light parcel on their own scales, so the same box can price higher or lower with them on a given lane. The only way to know for an order is to compare quotes for the packed parcel at purchase.

Where GoatLabels fits

GoatLabels does not set USPS prices, and nothing in it undoes the July 12 change. It quotes USPS, UPS and FedEx on every domestic parcel from one account, with one price per rate for the parcel as packed, shown before you buy, so the comparison in step 4 happens on your own box. A GoatLabels quote is not labelled with a USPS price-list name, so compare it with the table above rather than assuming it matches either column. For a day of orders, the bulk CSV importer takes up to 500 rows per file, rate-shops each row and picks a rate you can override before buying.

Limits that matter here: the app can charge the higher of the quoted and live price at purchase, carrier adjustments such as a re-weigh post to your wallet later, and GoatLabels cannot use your own USPS account or negotiated rates. Free: 50 shipments a month. Pro: a flat $40 a month, unlimited shipments. Label prices are the same on the Free and Pro plans; see pricing.