Calculating the precise amount you owe to the IRS takes some time. How much varies depending on where you live and work. Here's how income tax works.

The reason provisional income should concern many is that it determines how much of your hard-earned Social Security benefit could be taxed, reducing the net amount you actually receive.

If you don’t know what Net Investment Income Tax (NIIT) is, you’re not alone. This relatively new tax began a little over a decade ago but the number of taxpayers subject to the tax has ...