It depends.
See the following link for more information. You can use either the 5 digit PIN or your Adjusted Gross Income from your 2018 tax return.
5 digit PIN
You can log into TurboTax if you used the software in the past and log in to obtain the returns.
Accessing prior year returns in TurboTax
The other option is to order copies or transcripts from the IRS.
Requesting copies of prior returns from the IRS
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