File IRS Form 4506, Request for Copy of Tax Return
Complete the form with your name, Social Security number, address, and tax year requested
Sign and date the form
Include the required fee for each return copy requested
Mail the completed form to the IRS address listed in the form instructions
Request a tax return transcript online through the IRS Get Transcript tool if a transcript is sufficient
Call the IRS at 800-829-1040 for assistance
Contact your tax preparer if they have a copy of your filed return
Check your state tax agency website if you need a state tax return copy