Normally, taxpayers can either request a tax return transcript or order a full copy of a previously-filed return from the IRS.
However, the IRS has suspended virtually all manual operations due to the coronavirus (COVID-19) situation. This includes requests for copies of tax returns and mailed transcripts.
Only online tax return transcripts, which you can view, download, and print, are currently available through the IRS Get Transcript page.
Transcripts include most line items from your return, like your AGI, and look like this. They're available for tax years 2016 through 2019 and are free.