NOTE: When using a PIN to efile with this year, the only PIN that will work is the Self-Select PIN from last year (the one where you chose the 5 digits.) An efile PIN provided by the IRS in 2015 was only good that year, and will not work again, unless you happened to have used it for your Self-Select PIN as well.
The other option is to leave the PIN field blank and verify with the AGI field by entering the 2015 AGI from your original (not amended) return.
