Instructions

1

Go to the IRS website and click in the "Individuals" tab. Then select the "IRS Withholding Calculator" option. H&R Block also offers a deduction finder, an alternative minimum tax exemption estimator and a withholding calculator.
2

Collect your most recent pay stub and your current tax return. You'll need the information for the questions the tax calculator asks.
3

Read the information on the page about the tax calculator and scroll to the bottom of the page and click "continue to the withholding calculator" on the IRS website. Click the appropriate tax estimator on the H&R Block website.
4

Fill out the information that is requested on the calculator. Make sure you fill out all the information so you can get a good determination of your tax liability and what should be withheld from your pay check.