The Facts About Income Tax Millions faithfully file their 1040 forms each April. But some things about federal income taxes may surprise you. Share | Related Content Making Your Tax Bracket Work Have you explored all your options when it comes to managing your taxable income? Donating Art: Taxation Abstraction The tax rules that govern donating art are complex and confusing. Take a closer look. Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax.