With the 2016 USPS rate increase going into effect on Sunday, January 17, 2016, all postage printed via Stamps.com will now reflect the new 2016 USPS rates. No action is required of customers.
Stamps.com mailing and shipping solutions are designed to reflect real-time USPS pricing and will transition to the new rates in real time, enabling customers to print postage without any service disruptions.
Stamps.com Software Customers
Special Note: If you print First Class Package Service for packages weighing between 1 and 3 ounces, you will need to download the latest version of the software (Version 13.3). This will allow you to receive the $2.54 rate instead of the $2.60 rate for packages weighing 1 ounce, 2 ounces and 3 ounces.
Get more info on the 2016 USPS postage rate increase.