When do you have to start using the new ##Question_Title##.42 stamps?

Question

does usps return if they only get 41?

Answer 1

The stamp rate hike went into effect on May 12.  You will need to use the 42 cent stamps now.  I believe the USPS will return the piece of mail to you if you do not have enough postage.

Answer 2

It started two days ago.  If you actually put a 41 cent stamp on it, yes it would be returned.  If you used one of the newer "First Class" stamps without the amount printed on it, it is good for first class postage regardless of what it gets raised to.

Answer 3

It started Mon. May 12th. You can use the forever stamps even when they raise it again, and they will again and again. So I would invest in them right away.