This form is for general instructions that apply to all corporation tax forms. It includes a variety of topics about how to fill out your form.This part explains what you can deduct as home mortgage interest. It includes discussions on points and how to report deductible interest on your tax return. Attach most recent W-2, 1099s, K1s and income tax returns. List any amount deducted from gross income for retirement benefits or tax deferred savings. The pay statement provides details about your current and year-to-date earnings, taxes, deductions, and accrued leave time. The optional method allows you to deduct the mortgage interest and state and local real property taxes reported on Form 1098, Mortgage Interest Statement. Step 1: Complete the taxpayer information section. Notice: You are required to attach to this form the following documents: A current and representative paycheck stub;.