There are two types of PINs that one may have to deal with when e-filing with the IRS. There's a 5-digit pin and a 6-digit pin.
The 5-digit pin is your signature to "sign" the return. Typically, this pin does not change unless you consciously take physical action on the IRS website to change it. (Don't know if you can still do that either.)
The 6-digit pin is an identity protection pin. This pin *DOES* *CHANGE* every year, and the IRS will send you your new 6-digit pin each year, via the U.S. postal service to the address on your most recently filed tax return. or most recently filed IRS Form 8822-Change of Address from.
Instructions have already been provided earlier in this thread on how to enter the 6-digit identity protection pin.
