Updated Postal Rates for January 2023
Domestic Mailing Price Updates went into effect January, 2023:
The First Class Mail letter (1 oz.) rate for postage purchased at the Post Office will increase to $0.63 (a change of $0.03 from early in the year). That means that Forever Stamps will increase to $0.63, and that the amount you need on an envelope in vintage postage for the forever stamp equivalent (if not using a forever stamp) will still be $0.63 .
Each additional ounce for a First Class Mail letter will cost $0.24, rather than $0.20, a four cent increase from 2021. That means instead of $0.70 for many wedding invitations that weigh 1.1 oz. - 2.0 oz., it will now be $0.87 to mail those invitations, and an additional $0.24 for each additional ounce beyond that.
More detail can be found on the USPS website here.