The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you. Related Content Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable. 16 Wall Street Cliches in 60 Seconds Pundits say a lot of things about the markets. Let's see if you can keep up. Your Shifting Risk Tolerance Time and market performance may subtly and slowly imbalance your portfolio.