If you received an IP PIN or CP01A notice from the IRS in the
past (or you opted in to the pilot program) you must use your 2018 IP PIN to
validate your identity when you file your 2018 return. We are unable to issue
IP PINs and you won't find them on your tax paperwork. You can only get IP PINs
from the IRS by following
these instructions.
You cannot use last year’s IP PIN. The IRS will send you a CP01A
notice with your new IP PIN by early January of 2019. That's the one you'll need to
file your 2018 return.
If you lost your IP PIN or haven't received one yet, learn how to get one.
Please see this FAQ if you got a E-file reject IND-181-01 code:
https://ttlc.intuit.com/replies/5883221
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