That also varies depending on where you live and work. Here's a primer on income tax: what it is, how it works, how to calculate it and which states don't have it.

A White House study says the wealthiest households pay an average tax rate of 8.2%. If that’s right, the Biden administration has a firmer case for raising taxes on the ultrarich.

How to calculate your Social Security tax obligations The IRS uses what's called "provisional income" to determine how much of your Social Security benefits are taxable.

What's adjusted gross income, also known as AGI? Here's what to know about this important income tax calculation.