Tax Guide IRS Form 4506 and 4506-T: How mortgage lenders verify a prospective tenant’s income with the IRS When you apply for a loan, especially for a mortgage, you may have to submit IRS Form 4506 or Form 4506-T. Lenders use these forms to verify your income ... Tax Guide Request Previous Tax Returns with Form 4506-T Even though we may want to file our taxes and forget about them, sometimes it’s necessary to dig up your income tax returns from previous years. In most cases, ...