The IRMAA Cliff: How to Avoid $2,300 in Annual Medicare Surcharges

IRMAA (Income-Related Monthly Adjustment Amount) is a Medicare surcharge that applies when your annual income crosses a hard threshold — earn just $1 over the line and you owe the full penalty for the entire year, with no gradual increase. In 2026, the first threshold is $109,000 for single filers and $218,000 for married couples filing jointly. Crossing it costs each person an extra $972/year in Part B premiums alone — for a couple, that is $2,297 in additional Medicare costs every year. The danger for retirees with large 401(k)s: Required Minimum Distributions (RMDs) that kick in at age 73, stacked on top of Social Security income, push thousands of retirees over the cliff automatically — often with no warning until the Medicare premium bill arrives.

How IRMAA works: the hard cliff most retirees do not see coming

Most income-based rules phase in gradually. IRMAA does not. It works like a staircase with sharp vertical drops at each step:

• Your income for 2024 determines your Medicare premiums for 2026 — a two-year lookback.
• One dollar over a threshold triggers the full surcharge for that tier for the entire year.
• The surcharge is added to both Part B (medical coverage) and Part D (drug coverage) premiums automatically — you do not choose it and cannot opt out.
• If both spouses are on Medicare, both pay the surcharge.

The 2026 IRMAA brackets: the full cost at every income level

Part D (prescription drug) surcharges add another $14.50–$91.00/month per person on top of these amounts. For a married couple where both spouses are on Medicare, crossing the first cliff costs $2,297/year in extra Part B premiums alone. Crossing into Tier 2 adds another $3,475/couple on top of that.

Remember: these premiums are based on your income from two years ago. A large Roth conversion, RMD, or capital gain in 2024 will raise your 2026 Medicare bill. You cannot react to IRMAA the year it hits — you must plan ahead.

Why retirees with large 401(k)s get blindsided at 73

The collision happens at age 73, when Required Minimum Distributions begin. The IRS forces you to withdraw a minimum amount from every traditional pre-tax retirement account (401k, traditional IRA, 403b) every year. You cannot skip the withdrawal or defer it — the penalty for missing an RMD is 25% of the missed amount.

The RMD formula is simple: divide your account balance from December 31 of the prior year by a life expectancy factor from the IRS Uniform Lifetime Table. At age 73, the divisor is 26.5. Here is what that means for common account balances:

Social Security makes the problem worse in a subtle way: up to 85% of your Social Security benefit is taxable once total income exceeds $44,000 for a married couple. So your $5,200/month ($62,400/year) SS benefit adds approximately $53,040 to your taxable income — on top of every dollar of the RMD.

This is the trap. A retiree who worked hard, saved diligently, and built a $1.8 million 401(k) is not "rich" by most definitions — but Medicare treats them the same as someone who earns $250,000 a year, and charges them accordingly.

The six-year window before the cliff: your best chance to act

The years between retiring (or age 64) and turning 70 are the most financially valuable planning window most retirees will ever have. During this period:

• Earned income is gone or very low
• Social Security has not started (no SS income on your tax return)
• RMDs have not started (no mandatory pre-tax withdrawals)
• You are in the lowest tax brackets you will see for the rest of your life

This gap creates room to do Roth conversions — voluntarily pulling money out of your traditional 401(k) or IRA, paying income tax on it now at a relatively low rate, and moving it into a Roth IRA where it grows tax-free forever and is never subject to RMDs.

Every dollar you convert and move to Roth is a dollar that will never appear in your age-73 RMD calculation. Reduce the pre-tax balance enough and you permanently cut the RMD below the IRMAA cliff — for every year of retirement, not just one.

Roth conversion strategy: a realistic year-by-year plan

How much can a married couple realistically convert each year during the pre-70 window?

A couple doing $80,000/year in Roth conversions from ages 64–69 (six years) converts $480,000 total. On a $2.5 million starting 401(k) balance with 6% annual growth, the remaining pre-tax balance at 73 would be approximately $1.6 million — cutting the first-year RMD from $94,340 to roughly $60,377. Combined with $62,400 in Social Security, total MAGI is approximately $122,777 — still over the Tier 1 cliff for a married couple, but a $31,000 reduction compared to no action.

More aggressive conversions of $100,000–$120,000/year during the gap can reduce the 401(k) enough to bring total MAGI below $109,000 (single) or $218,000 (married) — clearing the cliff entirely. Use the IRMAA Calculator to enter your exact income sources and see which tier you are in — and how much conversion headroom remains. The RMD Estimator shows your projected RMD at any future age and balance.

Why delaying Social Security to 70 helps — but does not solve the problem alone

Delaying Social Security from your Full Retirement Age (67 for most current retirees) to age 70 increases your benefit by 8% per year — a total increase of 24%.

Delaying to 70 also permanently boosts the survivor benefit — the higher of two benefits a couple receives for the rest of their lives if one spouse dies. If the higher earner delays and then dies first, the surviving spouse keeps the $4,960/month benefit instead of $4,000/month — a difference of $11,520/year for potentially decades.

Here is the catch: delaying Social Security means three additional years (67–70) with no SS income. You need another income source during that period. The answer is usually the 401(k) — which simultaneously does the Roth conversion work described above. Drawing down the pre-tax account during ages 67–70 for living expenses achieves two goals at once: it funds your lifestyle during the SS delay, and it reduces the balance that will drive RMDs starting at 73.

5 other strategies to stay below the IRMAA cliff

1. Qualified Charitable Distributions (QCDs)

If you are 70½ or older and make charitable donations, you can donate directly from your IRA (up to $108,000/year in 2026) to a qualified charity. This amount counts toward your RMD but is excluded from your AGI entirely — it never appears in your taxable income. For a retiree donating $20,000/year to charity, routing it through a QCD instead of a personal check reduces MAGI by $20,000 — potentially enough to drop below the IRMAA cliff.

2. Appeal IRMAA if your income dropped

IRMAA looks back two years, which means a high-income year from your working life can haunt your Medicare premiums in early retirement. If your income has since dropped significantly due to retirement, reduced hours, loss of a spouse, divorce, or loss of income-producing property, you can file Form SSA-44 to request that Medicare use a more recent (lower) income year. Appeals based on retirement are approved routinely.

3. Harvest capital losses to offset gains

If you have investments in a taxable brokerage account, harvesting capital losses in a high-income year can reduce MAGI. Selling investments that are down and using those losses to offset capital gains keeps MAGI lower, reducing IRMAA exposure in the year of the offset and the two years it affects Medicare premiums.

4. Manage the timing of large one-time income events

Selling a rental property, taking a large distribution, or exercising stock options can spike MAGI significantly in a single year, triggering two years of elevated IRMAA premiums. If you have flexibility in timing, spreading a large transaction over two tax years — or placing it in a year before Medicare begins — can prevent the cliff hit entirely. The two-year lookback makes timing precision valuable.

5. Health Savings Account (HSA) contributions if still eligible

If you retire before 65 and are enrolled in a High-Deductible Health Plan, you can continue contributing to an HSA — $4,300/year for individuals and $8,550 for families in 2026, plus a $1,000 catch-up contribution if 55 or older. HSA contributions reduce your AGI dollar for dollar, directly lowering MAGI. You must stop contributing when you enroll in Medicare Part A, but amounts accumulated before Medicare enrollment can be withdrawn tax-free for qualified medical expenses at any age.

The bottom line: act before 65, not after 73

The IRMAA cliff is not a problem that announces itself. It lands in your Medicare premium bill without warning, based on income you reported two years earlier. By the time you see it, it is too late to prevent that year's surcharge — you can only file an appeal if circumstances have changed.

The window to prevent IRMAA from hitting you in retirement is the years before 70, when all three income sources (earned income, Social Security, and RMDs) are still quiet. That window is finite. Every year you delay Roth conversions is a year the pre-tax balance continues growing — compounding the future RMD problem.

A couple with a $1.8 million 401(k) who spends ages 64–70 converting $80,000–$100,000 per year to Roth — paying perhaps 12–22% tax on those conversions — can permanently eliminate a $2,297+/year IRMAA surcharge for the rest of their lives. The math frequently works in the Roth conversion's favour even at the 22% bracket.

Key takeaways

• IRMAA is a Medicare surcharge that kicks in when MAGI exceeds $109,000 (single) or $218,000 (married). One dollar over the threshold triggers the full penalty for the entire year.
• The first cliff costs a married couple $2,297/year in extra Part B premiums alone. Tier 2 adds another $3,475 on top.
• IRMAA uses a two-year lookback — your 2026 premiums are based on 2024 income. You cannot react to IRMAA the year it hits; you must plan years in advance.
• At age 73, Required Minimum Distributions from a large 401(k) stack on top of Social Security income and push the combined MAGI over the IRMAA cliff automatically for many retirees.
• The pre-70 window (especially ages 64–70) is the optimal period for Roth conversions. Earned income is gone, SS has not started, RMDs have not started, and tax brackets are at their lowest. Converting $60,000–$100,000/year during this window permanently reduces future RMDs.
• Delaying Social Security to 70 raises benefits by 24% and boosts the survivor benefit — and the income gap is best funded by the same 401(k) drawdown strategy that reduces future RMDs.
• Qualified Charitable Distributions (QCDs) reduce MAGI dollar for dollar for retirees who donate to charity — a powerful tool for those close to the cliff who are already taking RMDs.

Frequently asked questions

What is the IRMAA cliff?

The IRMAA cliff is a Medicare surcharge threshold where earning just $1 over a set income level triggers the full premium surcharge for the entire year. In 2026, the first cliff is $109,000 MAGI for single filers and $218,000 for married couples. Crossing it adds approximately $972/year per person in Part B premiums; for a couple, that is $2,297 extra annually. There is no gradual phase-in — the cliff is all-or-nothing.

How does a 401(k) trigger the IRMAA surcharge?

Required Minimum Distributions from traditional 401(k) and IRA accounts begin at age 73 and are counted as ordinary taxable income. On a $1.8 million balance, the first-year RMD is approximately $67,900. Combined with Social Security income, total MAGI easily clears the married-couple threshold of $218,000 — triggering the surcharge automatically without any planning error by the retiree.

What is the two-year lookback for IRMAA?

Medicare uses your MAGI from two years prior to set current-year premiums. Your 2026 Medicare premium is based on your 2024 tax return. This means income spikes from a Roth conversion, large RMD, or property sale in 2024 will raise your 2026 Medicare costs — even if your 2025 income was much lower. You cannot fix a past year; you can only prevent future years by managing income proactively.

What is the best strategy to avoid the IRMAA cliff before age 70?

Roth conversions during the retirement gap (ages 64–70) are the highest-leverage strategy. During this window, earned income, Social Security, and RMDs are all zero — leaving maximum room to convert pre-tax 401(k) balances to Roth IRA at low tax rates. Every dollar converted permanently reduces future RMD income, keeping MAGI below the IRMAA threshold for the remainder of retirement.

Can you appeal an IRMAA determination?

Yes. File Form SSA-44 with the Social Security Administration if your income dropped due to retirement, reduced work hours, loss of a spouse, or another qualifying life event. Medicare will use a more recent income year, reducing or eliminating the surcharge. Appeals based on retirement from full-time work are granted routinely.