Retirement · 6 min read · 2026-02-12
The 9-step IRMAA bracket management.
Medicare premiums are not flat. Above specific income thresholds, surcharges add thousands per year. Nine steps keep them in check.
A single dollar over the threshold can cost $5,000.
IRMAA surcharges step up at specific MAGI thresholds. Above each step, premiums for both Part B and Part D rise. At the top brackets, the combined annual surcharge for a married couple can exceed $10,000. The 2-year lookback means current actions affect premiums two years later.
The nine indicators
The nine steps of IRMAA management.
Each is a specific action to control the MAGI that drives IRMAA brackets. The composite preserves Medicare premium efficiency.
Two-year MAGI lookback awareness
Pattern: 2024 IRMAA = 2022 MAGI
IRMAA in any year is based on MAGI from 2 years prior. Plan accordingly.
Roth conversion bracket fill (not over)
Threshold: top of IRMAA bracket
Roth conversions add to MAGI. Sizing them to fill, but not exceed, the IRMAA bracket prevents premium spike.
Capital gains realization timing
Pattern: alternate year bunching
Bunch capital gains in low-MAGI years; defer in high-MAGI years. Avoid pushing across IRMAA thresholds.
RMD planning before age 73
Pattern: pre-RMD reduction
Pre-RMD Roth conversions reduce future RMD-driven MAGI. Smaller RMDs mean lower IRMAA exposure later.
QCD (Qualified Charitable Distribution) over 70½
Limit: $105K (2026)
QCDs reduce MAGI directly. They count toward RMD without adding to AGI. Powerful IRMAA tool for charitably-inclined retirees.
Tax-loss harvesting integration
Pattern: offset gains
Realized losses reduce MAGI. Coordinate harvesting with capital gain timing to manage IRMAA.
Tax-exempt interest (still counts)
Pattern: muni bonds in MAGI
MAGI for IRMAA purposes includes tax-exempt interest. Muni bonds reduce taxable income but not IRMAA MAGI.
Form SSA-44 for life-changing events
Pattern: appeal mechanism
Specific life-changing events (retirement, death, divorce, work reduction) allow appeal of IRMAA brackets via SSA-44.
Spread income across calendar years
Pattern: alternate-year strategy
Bunching one-time income (Roth conversion, large capital gain) into single years preserves IRMAA brackets in alternate years.
How IRMAA actually works
Income-Related Monthly Adjustment Amount surcharges raise Medicare Part B and Part D premiums for higher-income beneficiaries. The brackets step up at specific MAGI thresholds (in 2026, $103,000 single / $206,000 married is the first threshold; the top threshold is $500,000 single / $750,000 married).
The surcharges are non-trivial. Top-bracket Part B premium is approximately 3.4× the standard premium. Add Part D surcharges, and the combined annual cost for a top-bracket couple is $10,000+ above standard premiums. Each bracket step up represents thousands per year of additional Medicare costs.
The 2-year lookback
IRMAA in any year is based on MAGI from two years prior. 2026 IRMAA brackets reflect 2024 MAGI. This lookback creates planning opportunities: actions taken now affect premiums two years from now. Roth conversions in 2026 will affect 2028 IRMAA. The discipline is to plan multi-year tax windows with the 2-year shift in mind.
The lookback also creates appeal opportunities. Form SSA-44 allows IRMAA reduction when current circumstances (retirement, divorce, etc.) produce lower MAGI than the 2-year-prior period.
Roth conversion bracket-filling
Pre-Medicare retirees often have access to Roth conversion windows in their early 60s. The optimization is to fill conversion up to, but not over, IRMAA bracket thresholds. Crossing a threshold triggers thousands of dollars of additional Medicare premium two years later.
The math sometimes favors stopping conversion below the threshold even when more conversion would be tax-efficient on its own. The IRMAA tax adds roughly 5-8 percentage points of effective marginal rate at threshold crossings, which exceeds the federal income tax rate increase between adjacent brackets in many cases.
Tax-exempt interest counts
MAGI for IRMAA purposes adds tax-exempt municipal bond interest to AGI. Holders relying on muni bonds for tax-free income still face IRMAA exposure on the interest. The implication is that the tax-efficient muni-heavy portfolio still drives IRMAA brackets.
The remediation depends on the household's income profile. For high-income retirees facing IRMAA regardless of bond choice, the muni decision is unchanged by IRMAA. For households just above the threshold, the muni interest may push them into a higher bracket, and reducing muni holdings (or replacing with TIPS or tax-deferred bonds in tax-deferred accounts) can preserve the lower IRMAA bracket.
Get the nine, every Monday.
Free weekly digest. The only U.S. equity letter that publishes a name only when nine independent signals align.
Common questions
Questions.
Are IRMAA brackets indexed?
Partially. Recent legislation indexed brackets to inflation prospectively. Pre-2020 brackets were not indexed for years.
Can I appeal IRMAA?
Yes via Form SSA-44 for specific life-changing events: marriage/divorce, retirement, death of spouse, loss of pension or income, etc.
What's the maximum IRMAA?
Top bracket adds approximately $4,560 (Part B) + $590 (Part D) per beneficiary annually in 2026. For a couple, both face the surcharge.
Are HSA contributions excluded from IRMAA MAGI?
Yes, HSA contributions reduce AGI and thus MAGI. Useful pre-65 strategy.
Does Roth IRA distribution affect IRMAA?
No. Qualified Roth distributions are excluded from MAGI. Significant IRMAA-management advantage.
What about long-term capital gains?
Yes, included in MAGI. The capital gains rate may be 0-20% but the IRMAA bracket impact is separate. Plan accordingly.
One name. Sometimes weeks of silence. Always with conviction.
Free weekly digest. No credit card. Unsubscribe anytime.