learn how to fill out income tax return
How to Fill out Income Tax Return Forms August 28, 2007. 1  How to Fill out Income Tax Return Forms. 2  Fill out your tax forms by printing your answers in the blanks using an ink pen, or type your answers in the blanks. 3  Follow the directions provided in the instruction booklet that corresponds with your tax form.  Mail your tax return forms to the address listed for your state. You can find it on the last page of the instruction booklet. The address to which you mail your forms will also depend on whether you are including a check or filing late. Decide whether to file online.