Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. 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. Filing Final Tax Returns for the Deceased The federal government requires deceased individuals to file a final income tax return. Tax Freedom Day Assess how many days you'll work to pay your federal tax liability.