85% of your SS benefits will be taxable so you will have to adjust for that income on the W-4 OR have withholding from the SS benefits.
Use the Tax Withholding Estimator on the IRS web site to figure out what you should put on the W-4 form that you give to your employers. It's much easier than using the worksheets on the form. It will let you adjust your withholding to get the approximate refund amount that you want.
Tax Withholding Estimator
You can ask us to withhold federal taxes from your Social Security benefit payment when you first apply.
If you are already receiving benefits or if you want to change or stop your withholding, you'll need a Form W-4V from the Internal Revenue Service (IRS).
You can download the form or call the IRS toll-free at 1-800-829-3676 and ask for Form W-4V, Voluntary Withholding Request. (If you are deaf or hard of hearing, call the IRS TTY number, 1-800-829-4059.)
When you complete the form, you will need to select the percentage of your monthly benefit amount you want withheld. You can have 7, 10, 12 or 22 percent of your monthly benefit withheld for taxes.
Only these percentages can be withheld. Flat dollar amounts are not accepted.
Sign the form and return it to your local Social Security office by mail or in person.
If you need more information
If you need more information about tax withholding, read IRS Publication 554, Tax Guide for Seniors, and Publication 915, Social Security and Equivalent Railroad Retirement Benefits.
If you have questions about your tax liability or want to request a Form W-4V, you can also call the IRS at 1-800-829-3676. (If you are deaf or hard of hearing, call the IRS TTY number, 1-800-829-4059.)
