Postage Options | USPS
www.usps.com › business › postage-optionsFill out a postage statement to determine how much postage you owe when you drop off your mail at the Post Office ™. Pay for Stamps Used. Establish an advance deposit account to pay for the postage you owe on your precanceled stamp mailings. Mailpiece must have a complete domestic return address in the upper-left corner.