Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Related Content Home Mortgage Deduction Use this calculator to assess the potential benefits of a home mortgage deduction. Get Paid for Going Green Those looking into environmentally minded home modifications may get a boost from Uncle Sam’s tax incentives. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates.