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 Making Your Tax Bracket Work Have you explored all your options when it comes to managing your taxable income? Tax Deductions You Won't Believe Here are some examples of deductions from the IRS that were permitted and some that were, uh, too creative. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates.