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My wife needs to provide official tax returns for every year we filed jointly to prove to USCIS that we are in a real and functional marriage in "good faith".
You can get a free federal tax return transcript from the IRS here - https://www.irs.gov/individuals/get-transcript
If you actually need a certified copy of the federal tax return, then you will need to complete IRS Form 4506 for each tax year needed. There is a fee of $50 for each copy of a tax return. Check the box on Line 6 Note: If the copies must be certified for court or administrative proceedings, check here
IRS Form 4506 - https://www.irs.gov/pub/irs-pdf/f4506.pdf
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