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 Will You Pay the AMT? Despite recent tax-law changes, many Americans are expected to pay the AMT this year. 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. Tax Management Strategies Learn more about taxes, tax-favored investing, and tax strategies.