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There is no single percentage of retirement income that everyone should set aside for federal taxes. The amount depends on which income is taxable, your filing status, deductions and credits, and how much tax is already being withheld or paid. Estimate your full-year tax first; treat any flat percentage as a budgeting shortcut, not an IRS rule.
How to estimate the federal tax you will owe
Start with an annual estimate rather than applying a percentage to your gross retirement income. The IRS’s Publication 505 for 2026 explains estimated tax and payment rules; the IRS taxable Social Security benefits guidance can help with that part of the calculation.
- List the year’s income by source. Include taxable pension and annuity income, traditional IRA or plan withdrawals, interest, dividends, realized gains, wages, and any taxable Social Security. Do not assume that every dollar from a source is taxable: some income may be tax-free or partly taxable.
- Estimate taxable Social Security, if applicable. The IRS worksheet combines expected benefits with other income and specified adjustments. Benefits may be partly taxable; do not assume they are all tax-free or all taxable.
- Apply your expected filing status, deductions, and credits. Use these to estimate federal income tax for the year. Without household income and filing details, there is no reliable way to turn the title question into a personal reserve percentage.
- Subtract tax payments already expected. Count federal withholding and estimated payments, along with applicable credits. Compare the remaining balance and your payments with the estimated-tax rules below.
- Adjust payments if needed. Use the IRS Tax Withholding Estimator and update the form relevant to the income source, or make estimated payments. Revisit your estimate if withdrawals, income, or household circumstances change.
A separate savings reserve is a budgeting choice: it can help you pay a future bill, but it is not the same thing as your tax liability or the schedule for paying it.
When estimated tax payments may be required for 2026
Federal income tax is generally paid as income is received through withholding, estimated payments, or both. For 2026, the IRS generally says to consider estimated payments if you expect to owe at least $1,000 after withholding and credits, and your withholding and credits are below the smaller of these two amounts:
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- 90% of your expected 2026 tax; or
- 100% of your 2025 tax. The prior-year benchmark rises to 110% for specified higher-income taxpayers: generally, those with 2025 adjusted gross income above $150,000, or above $75,000 if filing married filing separately for 2026.
These are estimated-tax benchmarks, not a recommended percentage of retirement income to keep in savings. The applicable test depends on your circumstances. Consult the IRS’s Publication 505 and Form 1040-ES instructions for payment amounts and timing.
Withholding depends on the kind of retirement income
Withholding is a prepayment toward your eventual tax bill, not a declaration of your final tax rate. The applicable form and default treatment depend on the payment.
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| Income or payment type | Federal withholding treatment for 2026 | What to consider |
|---|---|---|
| Periodic pension or annuity payments | Provide information to the payer on Form W-4P. A default treatment can apply if the payer has no certificate. | Withholding depends on the information you provide and may need adjustment to reflect other household income. |
| Ordinary nonperiodic distributions | Publication 505 gives a general 10% default rate. Form W-4R can be used to choose a different rate, subject to the payment’s rules. | The default is a withholding rate, not a guarantee that your total tax will be covered. |
| Eligible rollover distributions | The taxable amount generally has mandatory 20% withholding; you cannot choose a lower rate through Form W-4R. | Withholding still does not determine your final tax liability. |
| Social Security benefits | Some benefits may be taxable. You can elect federal withholding using Form W-4V. | Include estimated taxable benefits when projecting total household tax. |
| Interest, dividends, gains, and other income | Withholding may not cover these amounts. | They can increase the amount to cover through withholding or estimated payments. |
The 10% and 20% figures are specific withholding rules for certain distributions; neither is a suitable across-the-board reserve percentage for all retirement income.
Recheck your plan when income or circumstances change
Retirement itself, a new withdrawal, investment income, or another change in household income can make an earlier estimate less useful. The IRS advises checking withholding when income is not subject to withholding or circumstances change. Use the Tax Withholding Estimator to review your projection, then update withholding or estimated payments as appropriate. The IRS notes that too little withholding can lead to a tax bill or penalty, while too much can leave you without use of the money until a refund arrives.
Federal rules do not settle state and local taxes
This calculation covers U.S. federal income tax. State and local tax treatment depends on where you live and is not determined by the federal rules described here. Check the rules for your state and locality before deciding how much cash to reserve overall.
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