The price of Forever stamps increased by 1 cent on Sunday, January 21st. Forever stamps now cost 50 cents, instead of 49.
The rates for postcards, letters being mailed to international destinations, and for additional ounces will not be affected by this rate increase.
“Forever” stamps, first introduced in 2007, are valid for sending a First-Class letters forever, regardless of future rate increases.
This means that if you have any unused Forever stamps still sitting around, you can still use them on First-Class letters — they will always be worth the current Forever stamp value, no matter how much you originally paid for them.
For more information on Forever stamps, including a brief history and a thorough explanation of how they work, check out this article.