what happens if i file my tax return without a w2
3. Use Form 4852 and your last paystub to file income taxes. Failing that, you can use IRS Form 4852 to file your tax return. Download Form 4852 from the IRS website and complete it using a copy of your last paystub. Once complete, attach Form 4852 to your 1040 or other tax form and send it to the IRS. Note that the IRS will not accept tax returns without a W-2 form until after February 13, 2015.