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 Home Mortgage Deduction Use this calculator to assess the potential benefits of a home mortgage deduction. Tax Rules When Selling Your Home The tax rules governing profits you realize from the sale of your home have changed in recent years. Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable.