4506 T Tax Return | Tax Return 4506-T The Form 4506-T is an IRS form used to Request a Transcript of your tax return. This form is different from the 4506, which we will go through here. Typically, this form is used in connection with obtaining lending, specifically a mortgage. The lender will request you sign the 4506-T as it will allow them access to your tax return records for the past few years, usually they prefer to review the last three. A Form 4506-T can also be used to review a past return in the event you need to file an amended return or if you have misplaced a return and need a copy on file. If you have an online account with the IRS website,