The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you. Share | Related Content You May Need to Make Estimated Tax Payments If… Have income that isn’t subject to tax withholding? Or insufficient withholdings? You may have to pay estimated taxes. What the New Tax Bill Means for You What does the Tax Reform and Jobs Act mean for you? Death is No Excuse The federal government requires deceased individuals to file a final income tax return.