IRS Publication 15 (Circular E) will show you how much will be withheld from your pay, based on pay amount and periodicity, as well as marital status and number of exemptions claimed. You can vary your number of exemptions somewhat, or have an additional amount withheld, in order to come closer to your actual tax obligation. Retirees may need to consider the tax impact of IRA withdrawals and other income, as well as changes in deductions. This holds for all retirees, not just federal. |
Here is a link that might be useful: IRS Forms and Publications