Why do I need an AIG from 2018

[ee-ea]

Security check  for efiling.  See this  https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947

[DawnC]

It is an IRS requirement.  From their website: When self-preparing your taxes and filing electronically, you must sign and validate your electronic tax return by entering your prior-year Adjusted Gross Income (AGI) or your prior-year Self-Select PIN.

Using an electronic filing PIN is no longer an option. Generally, tax software automatically enters the information for returning customers. If you are using a software product for the first time, you may have to enter the information yourself.

Validating Your Electronically Filed Tax Return