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Roth Conversion Calculator with IRMAA Cliff | 2026

Size a Roth conversion to fill your tax bracket without crossing the next Medicare IRMAA threshold: see your conversion tax, headroom to the cliff, and the surcharge a misstep triggers.

Quick answer: A Roth conversion can fill lower tax brackets, but too much income may trigger Medicare IRMAA surcharges. Compare conversion tax, bracket headroom, and IRMAA thresholds before converting.

SWReviewed by SwitchWize Research Desk · Last reviewed July 20, 2026
Estimated MAGI After Conversion
$130,000
Estimated MAGI After Conversion
$130,000
2026 First IRMAA Threshold
$218,000
Headroom Before First IRMAA Tier
$88,000
Conversion Room Before First IRMAA Tier
$168,000
Rule-backed calculation
Supported · 2026

Engine retirement-roth-conversion-irmaa-2026 · us-medicare-irmaa-2026@2026.1.0

Sources: 2026 Medicare Parts A & B Premiums and Deductibles · Form SSA-44 — Medicare Income-Related Monthly Adjustment Amount

  • Conversion tax uses the marginal federal and state rates entered and does not blend tax brackets or reconstruct a tax return.
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Estimated Tax on Conversion
$21,600
Estimated Annual IRMAA Surcharge at Resulting Tier
$02026 Part B and Part D IRMAA at the resulting canonical tier, per enrolled beneficiary
Diagnostic

Your estimated MAGI after the conversion is $130,000, leaving $88,000 before the first 2026 IRMAA tier.

The conversion's estimated tax is $21,600. The resulting-tier household annual IRMAA surcharge is $0; verify the two-year lookback and each person's Medicare coverage.

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What to do next

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Your action plan
  1. 1

    Set the target and timeline for this plan

    Estimate a 2026 Roth conversion tax scenario and first Medicare IRMAA tier exposure.

  2. 2

    Check the assumptions before using the result for a high-stakes decision

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Use the linked guide or product page for the next step

    Turn the result into a prioritized action instead of treating it as a one-off number.

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This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

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Frequently Asked Questions

Everything you need to know.

Why would I do a Roth conversion if it increases my MAGI and pushes me into a higher IRMAA tier?
A Roth conversion trades a higher Medicare premium in the conversion year for tax-free growth and withdrawals in retirement. Since IRMAA is based on income from two years prior, a conversion in 2026 affects your 2028 premiums, giving you time to plan. Additionally, converting now at a potentially lower tax bracket may cost less than taking larger required distributions later that trigger both income tax and higher IRMAA permanently.
How does the two-year IRMAA lookback period change my conversion strategy?
Your 2026 conversion affects your 2028 Medicare premiums, not your 2026 premiums, which means you have visibility into whether crossing an IRMAA threshold is worth it. You can coordinate conversions across multiple years to manage the timing of income spikes, or deliberately convert in a year when you know your modified adjusted gross income will be favorable to minimize the premium impact two years later.
Is the Roth Conversion Calculator with IRMAA Cliff free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the Roth Conversion Calculator with IRMAA Cliff affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to compare ira accounts, or run Money Map to compare this investing & retirement decision with your other opportunities.
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Where can I see the ranking methodology?
The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

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  1. 1Enter your numbers in the input panel.
  2. 2Review the live results and interpretation on the right.
  3. 3Use the diagnostic outputs to compare options or plan the next step.
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