64-Year-Old Retired Teacher With $1.1M 403(b) and State Pension Triggers Higher IRMAA Tier

64-Year-Old Retired Teacher With $1.1M 403(b) and State Pension Triggers Higher IRMAA Tier StockLite / Shutterstock.com Carl Sullivan Mon, June 8, 2026 at 5:21 PM GMT+7 6 min read Quick Read Crossing the $109,000 MAGI threshold by even $1 triggers roughly $1,150 in extra annual Medicare Part B and Part D premiums. CMS calculates IRMAA using income from two years prior, closing the planning window before most retirees realize they ve crossed the line. Bracket-filling Roth conversions before Medicare enrollment at 65 reduce future RMDs and keep MAGI below the $109,000 IRMAA cliff. Many financial professionals are salespeople paid on what they push, not whether you end up wealthier. A fiduciary is the opposite. The SEC legally requires them to put your interests first. Advisor.com s free matching tool pairs you with vetted fiduciaries from firms like Vanguard, Empower, and Edelman — in under three minutes. See who you match with today. A retired math teacher in her mid-60s with a seven-figure 403(b) did the responsible thing. She kept her withdrawals modest, lived below her means, and assumed her income was predictable. Then an unexpected bill arrived from Medicare. Let s assume our 64-year-old retired from a public school system with a $48,000 state pension and $1.1 million in a 403(b). She mapped out a conservative drawdown of $36,000 per year from the 403(b), bringing her ordinary income before Social Security to roughly $84,000. Comfortable, well under the top brackets, and seemingly nowhere near any income cliffs. Then she enrolled in Medicare and discovered an Income-Related Monthly Adjustment Amount (IRMAA) surcharge attached to her Part B and Part D premiums. The trigger was modified adjusted gross income (MAGI) from two years earlier, when a Roth conversion, a strong taxable account distribution, or the addition of Social Security benefits pushed her across a single threshold she never tracked. On Suze Orman s podcast, a 61-year-old retired educator recently asked the same underlying question: When and how to move money from a 403(b) to a Roth without creating a tax problem. Orman s answer leaned heavily on whether the pension alone covered living expenses, because "money that you withdraw from a traditional IRA counts towards income to calculate if you re going to pay tax on your Social Security or not. That is money that is used to calculate what your Medicare B premiums are going to be, and they will be higher because of that." The federal tax code is gradual. Under the 2026 brackets, 22% kicks in at $50,400 of taxable income for single filers, and 24% does not start until $105,700. One extra dollar of income costs a few cents of marginal tax. IRMAA is a cliff. One dollar over $109,000 in MAGI bumps Part B from the standard $202.90 per month to $284.10, and Part D adds another $14.50 monthly surcharge. That is roughly $1,150 of extra annual premium triggered by being one dollar over. Medicare uses MAGI from two years prior, so the 2028 premium reflects 2026 income. By the time the bill arrives, the planning window has closed. Most Americans suspect they re behind on retirement and never find out. Advisor.com s free matching tool pairs you in about three minutes with a vetted fiduciary advisor who can help you with investing, taxes, retirement, estate planning, and more. No minimums. No sales call. Find out where you stand. A pension of $48,000 plus a $36,000 403(b) draw equals $84,000. Add Social Security and even 85% of a $30,000 benefit lands MAGI right at the threshold. A single year of stronger 403(b) withdrawals, a capital gain from rebalancing a taxable account, or a modest Roth conversion can push her over. State-pension teachers historically had Social Security benefits reduced or eliminated by the Windfall Elimination Provision (WEP) and Government Pension Offset (GPO). The Bipartisan Policy Center noted that roughly 28% of state and local public employees, about 6.5 million people, work in jobs not covered by Social Security. The Social Security Fairness Act changed the operating rules, and a retired teacher s actual benefit depends on her state and how the repeal has been implemented. If she now collects a larger Social Security check than expected pre-repeal, more of it is taxable, and more of it pushes her toward the IRMAA line. Bracket-fill Roth conversions before Medicare enrollment. Between retirement and age 65, she has a clean window to convert chunks of the 403(b) at the 22% rate, stopping well below the IRMAA line. With the 24% bracket starting at $105,700 in 2026 and the IRMAA cliff at $109,000, Medicare sets the conversion ceiling here. Every dollar moved now is a dollar that will not inflate future RMDs and future MAGI. Time the 403(b) withdrawals around the two-year lookback. If she needs a larger one-time withdrawal, bunching it into a year that does not feed a future IRMAA calculation matters. Verify the Social Security benefit before locking in a claiming

64-Year-Old Retired Teacher With $1.1M 403(b) and State Pension Triggers Higher IRMAA Tier

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