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 | Have A Question About This Topic? Name Email Address Question Thank you! Oops! 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. Charitable Giving: Smart from the Heart Do you have causes that you want to support with donations? Are You at Peak Financial Fitness? Physical fitness and financial fitness are inextricably linked, says financial advisor Pamela Gilmour. Ignore your health or your wealth, and it can catch up to you.