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Retirement tax window
Retirement Tax Window Calculator
How much room might I have before taxes or Medicare costs rise?
Method checked September 22, 2026 · 2026 valuesWhat this tool helps you answer
How much room might I have before taxes or Medicare costs rise?
This tool compares your birth year and income estimates with dated rules for required withdrawals, federal tax brackets, and Medicare premiums. It helps identify questions to model more fully; it does not calculate a conversion recommendation or your total tax bill.
Transparent method
How the estimate works
See how the estimate is calculated
Use your birth year to screen when required withdrawals may begin and how many calendar years remain.
Compare estimated taxable income with the next 2026 federal ordinary-income bracket boundary for the filing status selected.
Compare the Medicare income estimate with the first 2026 IRMAA threshold. Medicare generally uses income from two years earlier; a 2026 income change would normally affect 2028 premiums, whose thresholds may differ.
What to check before acting on the result
How to read it
- Treat the bracket result as space to a threshold, not tax savings.
- Confirm which income year applies to the Medicare premium year you are planning for.
- Bring expected Social Security, pensions, sale proceeds, and withdrawals into a full projection.
Not included
- A full tax return or recommended Roth conversion
- Capital-gain stacking and deduction phaseouts
- State taxes or all Medicare premium tiers
- A forecast of future tax brackets or Medicare thresholds
Common questions
Frequently asked questions
Is the result a recommended Roth conversion?
No. It screens nearby thresholds. A conversion decision also needs expected future tax rates, available cash for taxes, account balances, and other income.
Why does Medicare look back two years?
Social Security generally uses the federal tax return from two years before the premium year to determine income-related surcharges. For 2026, that usually means 2024 income. Certain life-changing events may allow a new determination.
Are taxable income and Medicare income the same?
No. Taxable income is after deductions. For this Medicare screen, modified adjusted gross income is generally adjusted gross income plus tax-exempt interest.
Does a business sale affect this window?
A sale may add gains or ordinary income and alter the timing of later withdrawals. This quick screen does not model the transaction; bring the sale assumptions into a full cash-flow and tax review.
Sources
Rules and references behind this calculator
Want the fine print? See sources, methods, and limits.