In order to efile, you must enter in the 2018 AGI OR the 5 digit PIN from the 2018 return which is a number you picked to represent your efile signature.
**If the field is blank, just enter any 5-digit number. The same goes for your spouse if you're filing jointly.
And if you see a prefilled 5-digit number in this field, you can either leave it alone or re-enter a number you like better. It really doesn't matter.
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