Employees should use the Withholding Calculator on IRS.gov to do a Paycheck Checkup to see if they’re having the correct amount of income tax withheld from their pay. The calculator gives recommendations to help adjust their tax withholding.

The most common method is increasing or decreasing the number of allowances on Form W-4.

Other ways to adjust withholding are:

  • Withhold an extra flat dollar amount per paycheck on Form W-4.
  • Make estimated tax payments.

Source: https://www.irs.gov