Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. 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 Contents The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you. Six Most Overlooked Tax Deductions Six overlooked tax deductions to help manage your tax bill. Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax.