August 6, 2019 The IRS encourages everyone to use the Tax Withholding Estimator. It helps workers tailor the amount of income tax their employer should withhold from their paychecks and avoid unexpected results at tax time. The Estimator helps you target a tax due amount close to zero or a refund amount. Tips for using the Withholding Estimator: Gather your most recent pay stubs and tax return. Use the links within the Estimator to see if you qualify for credits and deductions. Include other sources of income, like self-employment income and Social Security benefits. Revisit this tool if your circumstances change.