To calculate your effective tax rate, you need two numbers: the total amount you paid in taxes and your taxable income for that year. You can find both numbers on your tax return.

Our stimulus check calculator can help you quickly get an estimate for how much you qualify to receive and whether the IRS underestimated your payment, meaning you may be due a so-called " plus-up ...

Credit cards charge interest, known as APR, if you carry a balance past your due date. Here's a step-by-step guide on how to calculate your credit card interest.