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 The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you. Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one.