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FIRST-CLASS MAIL LETTER 2017 POSTAGE RATES 2016 POSTAGE RATES INCREASE/DECREASE. First-Class Mail Letter (1 oz.) - Retail/Post Office Rate $0.49 $0.47 $0.02. Metered Mail (1 oz.) - Online Postage Providers and Postage Meters $0.46 $0.465 -$0.005. First-Class Mail Letter - each additional ounce $0.21 $0.21 NO CHANGE.
Summary of the 2015 Postage Rate Increase: 1  First Class Mail Letters (1 oz.) will remain the same at $0.49 when purchased at the Post Office. 2  Each additional ounce will cost $0.22 (up one cent from 2014). The discounted âMetered Mailâ category for First Class Mail Letters (1 oz.), which includes online postage providers and postage meters, will increase from $0.48 to $0.485 in 2015. 2  First Class Flats (1 oz.) will stay the same at $0.98 in 2015.