Rather than return a shipment with insufficient postage or charge the recipient postage due upon delivery, carriers will opt to pass along the difference in postage or “postage adjustment” to the shipper.

What might cause a postage adjustment?

You may see a postage adjustment for the following reasons:

The weight and/or dimensions entered for the shipment differ from what has been measured by the carrier.

This may result in the shipment requiring a different postage rate or mail class altogether.

• Ex. A shipment weighing 1.5 lbs entered as a USPS First Class shipment with a weight of 15 oz. The postage adjustment would reflect the correct USPS Priority Mail rate that the shipment should have been charged.*

The shipment count entered for a batch differs from what MailtoUsa actually received.

This will result in MailtoUsa making adjustments to the batch and/or entering the correct number of shipments in order to process your shipments.

The shipment does not qualify for the service or packaging used. 

• Ex. Shipment contents must meet USPS’s requirements for media to qualify for the Media Mail rate.*
• Ex. USPS First Class mail labels cannot be used in conjunction with with USPS Priority Mail packaging.

The shipment was mailed from the wrong origin or region.

Postage rates are based on two addresses, the induction address (origin) and the delivery address. Your region determines the induction address of your shipments.