Get Answers Support W-4/W-9/W-8 Form W-4 General What’s the best way to accurately estimate my withholdings? Last modified 5/25/2020 11:23:20 AM EST If you want to calculate your withholding with maximum accuracy and privacy, you can opt to use this IRS tax estimator app www.irs.gov/W4app. You will generally be guided to enter an additional amount to withhold in Step 4(c). Was this helpful? Yes No Need more help? Get in touch with our dedicated support team Contact Us (704) 684-4751 support@taxbandits.com Sign Up for a FREE TaxBandits Account! The Smart CPA Choice Register Now Already have an account? Sign in