Tax Bracket in Retirement: Why the Next Dollar Can Cost More

This guide is educational and general. It is written for retirees and pre-retirees in High Point, Greensboro, Winston-Salem, and across the Piedmont Triad, and it does not account for any one household's facts. Figures below are as of October 23, 2026, and the rules can change.

How is your tax bracket determined in retirement?

Federal income tax brackets apply to taxable income, and your filing status decides where each bracket begins. For tax year 2026, the IRS lists a standard deduction of $16,100 for single filers and $32,200 for married couples filing jointly, and additional amounts may apply if you are age 65 or older. (Source: IRS 2026 tax inflation adjustments, as of October 23, 2026)

A bracket is a range, not a flat rate on everything you earn. Only the income inside each range is taxed at that range's rate. The first four 2026 ranges look like this:

In retirement, several kinds of income feed that taxable income figure. Traditional IRA and 401(k) withdrawals are generally included, pension income generally is too, and so is the taxable portion of Social Security. Qualified Roth IRA withdrawals generally are not. (Sources: IRS Publication 590-B and IRS Publication 915, as of October 23, 2026)

How can you determine your tax bracket in retirement?

A rough estimate can be built in a few steps. It is a starting point for a conversation with a tax professional, not a tax calculation for your return.

• List the income you expect in the year: Social Security, pension, interest and dividends, realized gains, and planned IRA or 401(k) withdrawals.
• Estimate how much of your Social Security may be taxable, using the combined income rules in IRS Publication 915.
• Subtract your deduction to arrive at an estimate of taxable income.
• Compare that figure to the bracket table for your filing status, and note how much room is left before the next bracket begins.
• Repeat the exercise for later years, such as the year required distributions begin or the year one spouse is no longer filing jointly.

Your most recent filed return is a useful reference point, because it shows the taxable income line the IRS already has for you.

Does your tax bracket go down in retirement?

It could, but it may not. When paychecks stop, taxable income can fall for a stretch of years, which is why some households lower their bracket in the early years of retirement. That drop depends on circumstances, and it can reverse when Social Security begins, a pension starts, or required minimum distributions add income you cannot decline.

Filing status can also change the picture. The 2026 single brackets are narrower than the joint brackets: for example, the 22% bracket begins above $50,400 of taxable income for a single filer and above $100,800 for a married couple filing jointly. (Source: IRS 2026 tax inflation adjustments, as of October 23, 2026) A surviving spouse who files as single may land in a higher bracket on similar income. Brackets are also set by law that Congress can change, so no one can say with certainty what their bracket will be in the future.

Why can the next dollar cost more than your bracket?

Your bracket is what the tax table says. Your marginal rate is what the next dollar actually costs once every knock-on effect is counted. In working life those are usually close. In retirement they can diverge, because several separate rules key off the same income figure.

We call the zone where this happens the ring of fire. In certain income ranges, one additional dollar can do three things at once: it is taxed, it may make more of your Social Security benefit taxable, and it can push you across a Medicare surcharge threshold. A stated bracket of 22% can then understate the real cost of that dollar. How much it differs depends on your own income, filing status, and benefit amounts, and for many households the effect is smaller or absent.

The practical consequence: the years before required distributions begin may be worth more than the years after, because they are the years in which your taxable income is still something you can choose.

When do Social Security taxes and Medicare surcharges overlap?

They can overlap whenever the same income figure drives both. Two rules matter most.

Social Security becomes taxable in stages

Social Security is not taxed at a flat rate. The IRS looks at combined income, which is half of your benefit plus your other income, including tax-exempt interest. For single filers, benefits may become taxable above $25,000 of combined income, and up to 85% may be included above $34,000. For married couples filing jointly, the amounts are $32,000 and $44,000. (Source: IRS Publication 915, as of October 23, 2026)

Those percentages describe the portion of the benefit included in taxable income, not a tax rate. In the transition ranges, each additional dollar of other income can pull part of the benefit into taxable income as well, so one dollar can add more than one dollar to taxable income.

Medicare surcharges step up at fixed thresholds

Medicare Part B and Part D premiums include an income-related monthly adjustment amount, known as IRMAA, for higher incomes. For 2026, the standard Part B premium is $202.90 per month, and the first surcharge tier applies above $109,000 of modified adjusted gross income for single filers and above $218,000 for joint filers. (Source: CMS 2026 Medicare Parts A and B premiums, as of October 23, 2026)

The surcharge steps up when income crosses a threshold, rather than rising gradually. It is based on a tax return from two years earlier, so the bill can arrive two years after the income that caused it. (Source: Social Security Administration, as of October 23, 2026) Thresholds change each year, so confirm current figures before relying on them.

How do required distributions affect your bracket?

Once required minimum distributions (RMDs) begin, they take up bracket space whether or not you need the money, and the required percentage rises with age. Income you could otherwise have timed becomes income you must recognize. The age at which RMDs start depends on your birth year. Our RMD guide for retirees covers the starting ages, the birth-year table, and how the rules work.

How can withdrawal order change your bracket?

A common sequence is to spend taxable accounts first, then tax-deferred accounts, then Roth accounts. That order may lower this year's tax bill, but it does not necessarily lower the lifetime bill. Leaving pre-tax balances untouched can let them grow into larger required distributions later, which may arrive when the ring of fire is widest. Other approaches have their own trade-offs, and which one fits depends on the facts. Our guide to tax-efficient retirement withdrawal strategies looks at the questions worth modeling.

A Roth conversion is one way some households choose to recognize income on purpose in lower-income years. A Roth conversion is a taxable event that cannot be undone, and the converted amount can raise income used for Social Security taxation and Medicare surcharges. Our Roth conversion calculator can help you compare options using your own assumptions. It produces an educational estimate, not tax advice.

What should you model about your tax bracket in retirement?

• Model the marginal rate, not only the bracket. The figure that matters is the cost of the next dollar in each specific year.
• Know where the nearest threshold sits before December. Many of these effects are annual and can sometimes be managed by timing, though each choice has trade-offs.
• Treat the years before RMDs as worth a close look. They may be the only years in which the income figure is largely yours to set.
• Remember the survivor. Single brackets and single IRMAA thresholds are about half as wide as the joint amounts, and the change can arrive without warning.

Where can you take the next step?

If you would like to talk through how these rules may apply to your situation, you can Schedule a 30-minute conversation with us. You can also read about our tax planning and retirement income services.

This content is provided for educational purposes only and does not constitute tax, legal, or investment advice. Tax rules, thresholds, and Medicare premiums are subject to change. Consult a qualified tax professional for guidance specific to your situation.

This article is general information, not individualized investment, tax, or legal advice, and it does not account for your circumstances. Tax rules referenced are those in effect at the date shown and change over time. Consult a qualified professional before acting.