Usps Flat Rate Envelope Postage 2025. If approved, the new postage rates are scheduled to go into effect on january 19, 2025, resulting in a roughly 3%. Newsweek has reached out to the usps via email for comment on monday.
Newsweek has reached out to the usps via email for comment on monday. The baseline postage rate to mail a flat/large envelope will remain at $1.50 in postage.