Real Marginal Rate Calculator
What does the next dollar of IRA withdrawal really cost, once Social Security and Medicare react? Every piece below can be linked to, so it opens in a window on your reader's screen, current as of the record. No form to fill in.
2026 law · Reviewed September 5, 2026 · The full page, with methodology and sources · the terms · All tools
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Social Security, other income, filing status, and a step in; the real rate on that step, what drove it, and the whole curve across the income range out. In a frame it carries no cookies, no tracking, and a visible link back to the methodology. Your site has to allow frames; most do. The link that opens it in a small window is on the professionals page.
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- In plain words.
- Your tax bracket says what rate the last dollar of income is taxed at. But in retirement one more dollar of income can also make more of your Social Security taxable, shrink a deduction, or push you into a higher Medicare premium tier. So the real cost of the next withdrawal is often much higher than the bracket. This tool computes that real rate on a withdrawal of any size, says what drove it, and draws the whole curve so you can see where it peaks.
- Why it matters.
- Withdrawals and Roth conversions are sized against the real rate, not the printed one. Seeing the curve shows where a little more income costs a lot more tax, and where it stops.
- An example.
- A single retiree with $30,000 of Social Security and $40,000 of other income is in the 22 percent bracket. The next $10,000 of IRA withdrawal costs about $1,680 in tax, 16.8 percent, because part of it fills a lower bracket; a little higher up the curve the rate passes 40 percent as the benefit is pulled into income.
- Where it stops.
- It assumes ordinary income and the standard deduction. Capital gains and dividends sit in the same stack and shift the curve, and state tax adds to every point on it.
The facts
Six quotable sentences on the real marginal rate in retirement, 2026 figures.
The button shows exactly what your reader sees when they click the link. Paste the link where a link goes; it opens this list in a small window, always current as of the record, with the attribution and a link to the full page. Nothing to copy out, nothing to update later.
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- The bracket is not the rate. Once provisional income passes $25,000 single or $32,000 joint, each extra dollar of other income also pulls 50 cents of Social Security into taxable income; past $34,000 and $44,000, 85 cents. The dollar is taxed at the bracket rate 1.85 times.
- Example: a single retiree, 65 or older, with $30,000 of Social Security and $40,000 of other income sits in the 12% bracket, but the next $1,000 of IRA withdrawal costs $222: a real rate of 22.2%.
- A couple with $48,000 of benefits and $60,000 of other income: bracket 12%, real rate 21.6% on the next $1,000.
- The effect ends when 85 percent of the benefit is in income, which is why the real rate falls back to the bracket rate at higher incomes; the peak sits where the 85-percent phase-in meets the 22 percent bracket.
- Two more slopes hide in the same range: the senior deduction of $6,000 per person falls by 6 percent of income over $75,000 single and $150,000 joint, adding 6 percent of the bracket rate; and the Medicare tiers are cliffs, where one dollar can cost a full year's surcharge two years later.
- The practical use is sizing: a withdrawal or a Roth conversion is measured against the real rate on the dollars it adds, not the bracket printed on the return, and the shape of the curve says where to stop.
Bracket against real rate
Two households across the income range where the phase-in bites.
The button shows exactly what your reader sees when they click the link. Paste the link where a link goes; it opens this table in a small window, always current as of the record, with the attribution and a link to the full page. Nothing to copy out, nothing to update later.
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| Single: other income | Bracket | Real rate | Couple: other income | Bracket | Real rate |
|---|---|---|---|---|---|
| $30,000 | 12% | 22.2% | $50,000 | 12% | 22.2% |
| $40,000 | 12% | 22.2% | $60,000 | 12% | 21.6% |
| $50,000 | 22% | 23.3% | $70,000 | 12% | 12.0% |
| $60,000 | 22% | 23.3% | $80,000 | 12% | 12.0% |
| $80,000 | 22% | 23.3% | $100,000 | 12% | 12.0% |
| $100,000 | 22% | 23.3% | $120,000 | 22% | 23.3% |
| $130,000 | 24% | 25.4% | $150,000 | 22% | 23.3% |
Cite and link.
The clean address, a citation generated from the record so it can never carry a stale review date, and an address for every section so you can point a reader at the exact table or method.
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- Link
- https://consideratecapital.com/tools/real-marginal-rate-calculator
- Citation
- Considerate Capital, "Real Marginal Rate Calculator," reviewed September 5, 2026, https://consideratecapital.com/tools/real-marginal-rate-calculator.
Link to a section
- The calculator https://consideratecapital.com/tools/real-marginal-rate-calculator#calculator
- The facts https://consideratecapital.com/tools/real-marginal-rate-calculator#facts
- Bracket against real rate https://consideratecapital.com/tools/real-marginal-rate-calculator#key-numbers
- How the rate climbs https://consideratecapital.com/tools/real-marginal-rate-calculator#how-it-works
- Methodology https://consideratecapital.com/tools/real-marginal-rate-calculator#methodology
- Sources https://consideratecapital.com/tools/real-marginal-rate-calculator#sources
- Revision history https://consideratecapital.com/tools/real-marginal-rate-calculator#revision-history
Everything here reads from one reviewed record, so a copied piece carries its year and its review date. When the law moves, the embed updates by itself; a copied table or chart keeps the year in its caption. Corrections are welcome through the contact page.