The new USPS rates take effect on January 27, 2019. Below are the rate changes on the most popular services.

First Class Mailing Service Price Changes

Product
Current - 2018
New Rate - January 27, 2019
Letters (1 oz.) $0.50 $0.55
Letters additional ounces $0.21 $0.15
Letters (metered 1 oz.) $0.47 $0.50
Outbound International Letters (1 oz.) $1.15 $1.15
Domestic Postcards $0.35 $0.35

Priority Mail Retail Price Changes

Product
Current - 2018
New Rate - January 27, 2019
Small Flat Rate Box $7.20 $7.90
Medium Flat Rate Box $13.65 $14.35
Large Flat Rate Box $18.90 $19.95
APO/FPO Large Flat Rate Box $17.40 $18.45
Regular Flat Rate Envelope $6.70 $7.35
Legal Flat Rate Envelope $7.00 $7.65
Padded Flat Rate Envelope $7.25 $8.00