IRMAA Medicare Premium Planning for Affluent Retirees: Avoid Part B & Part D Surcharges

You can do something completely reasonable in retirement—sell a concentrated stock position, take a larger IRA withdrawal for a home project, or run a “smart” Roth conversion—and then get a letter two years later telling you your Medicare premiums are going up.

That’s the planning tension: the move itself may have been good. The surprise is the timing and the way Medicare measures income. IRMAA isn’t a penalty for being wealthy. It’s a predictable surcharge tied to how your tax return looks in a specific year—and it’s often avoidable with a little coordination.

I’m Alex Newman, a fiduciary advisor at Grape Wealth Management. In this article I’m going to treat IRMAA the way we treat it in real planning: not as a Medicare “choice,” but as a multi-year tax and cash-flow coordination problem. If you have a large IRA, a taxable brokerage account, and income that comes in lumps (capital gains, bonuses, business income, property sales), you need a framework that makes IRMAA predictable.

This is a supporting guide inside our cluster, Retirement Income & Tax Planning for $500K–$5M Households. If you want the bigger picture of how IRA, Roth, and brokerage withdrawals fit together, start with our pillar: /post/retirement-withdrawal-strategy-tax-smart-order-of-operations.

IRMAA in plain English: what it is, why it surprises people, and the two-year trap

IRMAA stands for Income-Related Monthly Adjustment Amount. That’s Medicare’s way of saying: if your income is above certain levels, you pay extra for Medicare Part B (doctor/outpatient coverage) and Part D (prescription drug coverage).

Two key points make IRMAA feel like it comes out of nowhere:

1) It’s based on your MAGI from your federal tax return.

MAGI is “modified adjusted gross income.” In most retiree situations, it’s basically your adjusted gross income (AGI) plus tax-exempt interest (like interest from many municipal bonds). If you don’t live in tax terms every day, the takeaway is simple: IRMAA looks at your total income picture, not just wages.

2) Medicare uses a two-year lookback.

Your Medicare premiums in (say) 2026 are generally based on your income from 2024. That means:

- You can trigger IRMAA today and not feel it until later.

- You can have a lower-income year now and still pay higher premiums because of a high-income year two years ago.

This is why affluent retirees get hit “by accident.” The year you sell a property, realize a large gain, or do a big Roth conversion is often not the year you’re thinking about Medicare premiums.

A quick note on thresholds: the first IRMAA threshold commonly discussed is MAGI over $218,000 for married filing jointly and over $109,000 for most other filing statuses (based on current SSA guidance). Exact brackets and surcharge amounts change over time, so I focus on the planning mechanics rather than printing a table that will age quickly. The Social Security Administration posts the current brackets and premiums here: https://www.ssa.gov/benefits/medicare/medicare-premiums.html.

The income “landmines” that push affluent retirees over IRMAA

In my experience, IRMAA isn’t usually caused by one big mistake. It’s caused by stacking several normal retirement-income items in the same tax year.

Here are the most common landmines for households with $500,000 to $5 million in investable assets:

Traditional IRA distributions (including “one-time” withdrawals)

If you take $80,000 from your IRA to buy a car, help a child, remodel a kitchen, or bridge a gap before Social Security, that withdrawal is typically taxable income. It increases MAGI, which can push you into an IRMAA bracket.

RMDs (Required Minimum Distributions)

Once RMDs start, you lose some control. The government tells you the minimum you must withdraw from traditional retirement accounts each year. If your IRA is large, RMDs can be large—and they can collide with Social Security, dividends, and capital gains.

If RMDs are on your horizon, read our supporting piece: /post/rmd-planning-required-minimum-distributions-what-to-do-early.

Roth conversions

A Roth conversion is moving money from a traditional IRA to a Roth IRA and paying tax now so future growth can be tax-free (assuming rules are met). The converted amount is generally added to taxable income.

Conversions can be a great strategy. They can also be an IRMAA trigger if you convert too much in one year, or if you convert in the wrong year (for example, the year you also sell a business interest or realize a large capital gain).

We go deeper on coordinating conversions across years here: /post/roth-conversions-early-retirement-multi-year-tax-plan.

Capital gains from taxable brokerage accounts

Selling an investment for more than you paid creates a capital gain. Long-term gains (held more than a year) are often taxed at favorable rates, but they still increase your income for IRMAA purposes.

This is a big misunderstanding: “But it’s just a capital gain” does not mean “it doesn’t count.” It counts.

Dividend and interest income (including mutual fund distributions)

Even if you don’t sell anything, you can have taxable income from dividends, bond interest, and year-end capital gain distributions from mutual funds.

Tax-exempt interest from municipal bonds

This one surprises people. Many municipal bonds pay interest that is exempt from federal income tax. But IRMAA adds tax-exempt interest back when calculating MAGI for Medicare.

So a muni-heavy portfolio can look “tax-light” but still push you into an IRMAA bracket.

Social Security taxation interactions

Social Security benefits can become taxable depending on your “provisional income,” which is a separate formula. When more of your Social Security becomes taxable, your AGI rises, which can raise MAGI and affect IRMAA.

If you want the simple explainer on how Social Security becomes taxable, see: /post/social-security-tax-planning-provisional-income.

Why affluent retirees are uniquely exposed: big accounts + lumpy years + fewer levers

If you’re close to retirement with meaningful assets, you usually have three characteristics that make IRMAA planning more important:

You have multiple “income engines.”

A typical household we work with might have:

- Social Security

- A pension (sometimes)

- Dividends and interest

- IRA withdrawals

- Brokerage sales (capital gains)

- Maybe rental income

Each one is manageable by itself. The problem is when two or three spike in the same year.

Your income is less “smooth” than it was while working.

Paychecks are steady. Retirement income often isn’t. You might have a year where you:

- Replace a roof

- Buy a vacation property

- Help a parent

- Sell a long-held stock

Those are normal life events. They create lumpy income.

You have fewer clean ways to “undo” a spike.

Once you realize a gain, it’s realized. Once you convert to Roth, it’s taxable for that year. Once you take a big IRA distribution, it’s income.

This is why I’m opinionated about IRMAA: it’s not something to “watch” after the fact. It’s something to model before you pull the trigger.

A practical framework: make IRMAA predictable in a 3–5 year map

Here’s the framework we use with clients. You can do a simplified version yourself, and it will still help.

Step 1: Build your “income ingredients” list

Write down every source that can show up on your tax return:

- IRA/401(k) withdrawals

- Roth conversions

- Social Security (and whether you’ve started)

- Pension

- Brokerage dividends/interest

- Planned sales in brokerage (capital gains)

- Real estate sales

- Business income

- Tax-exempt interest (munis)

Step 2: Identify the years that are likely to be lumpy

Common lumpy years:

- The year you retire (severance, bonus, unused vacation payout)

- The year you start Social Security

- The year you enroll in Medicare (often 65)

- The year you sell a property or concentrated holding

- The year RMDs begin

- The year a spouse passes away (filing status changes later)

Step 3: Overlay the two-year lookback

Now mark the “IRMAA impact year” two years later.

Example: If you plan a large Roth conversion in 2026, it may raise Medicare premiums in 2028.

This is the mental shift. You’re not just planning taxes for this year. You’re planning taxes plus Medicare premiums for future years.

Step 4: Decide which lever you’re using and what you’re giving up

Avoiding IRMAA is not always the right goal.

Sometimes paying an IRMAA surcharge is worth it if it enables:

- A large Roth conversion that reduces future RMDs

- A needed diversification sale of a risky concentrated position

- A one-time liquidity event that improves your life

The mistake is paying IRMAA accidentally. The better approach is choosing it deliberately, knowing the tradeoff.

Step 5: Keep the plan “range-based,” not perfect

You don’t need to predict your exact MAGI to the dollar. You need to know whether you’re likely to land:

- safely below a threshold,

- right on top of it (danger zone), or

- far above it (where small tweaks won’t matter).

If you’re in the danger zone, small decisions—like harvesting an extra $20,000 of gains—can be expensive.

A realistic example: the $2.4M household that triggered IRMAA by diversifying

Let me give you a realistic scenario (details simplified).

Mark (66) and Dana (64) are retired. They have:

- $1.6M in traditional IRAs

- $700k in a taxable brokerage account

- $100k in cash

- A paid-off home

They’re smart, disciplined investors. Their brokerage account includes a long-held stock position with a very low cost basis.

In 2024, they decide to diversify. They sell $300,000 of the stock and realize a $220,000 long-term capital gain.

Also in 2024:

- Mark starts Social Security.

- They take $40,000 from the IRA for a home renovation.

- Their portfolio throws off dividends and interest.

They don’t feel “high income” in the day-to-day sense. But on the tax return, 2024 MAGI is high.

In 2026, Mark enrolls in Medicare Part B and Part D. They get the IRMAA letter. Premiums are higher than expected.

Could they have avoided it?

Maybe. Not by avoiding diversification—but by changing the timing and the stacking.

Here are three alternative approaches that often reduce or eliminate surcharges:

1) Spread the sale across two or three tax years.

Instead of realizing $220,000 of gains in one year, realize $70,000–$110,000 per year, depending on the rest of the income picture.

2) Pair the sale with a lower-IRA-withdrawal year.

If you know you’re realizing large gains, consider funding spending from cash or from selling positions with smaller gains, rather than adding a big IRA withdrawal on top.

3) Coordinate Roth conversions away from gain years.

If Roth conversions are part of the long-term plan, gain years are usually not the year to “also” convert aggressively.

This is exactly why IRMAA planning is part of a broader withdrawal strategy. The account you pull from matters. The year you do it matters. And the combination matters.

If you want the deeper dive on capital gains timing and bracket management, see: /post/capital-gains-planning-retirement-timing-brackets-niiit.

The underrated lever: controlling which account funds your lifestyle

Most retirees think Medicare premiums are a Medicare problem.

In reality, for affluent households, Medicare premiums are often a withdrawal-order problem.

If you have money in three “buckets”:

- Traditional IRA (taxable when withdrawn)

- Roth IRA (generally tax-free when withdrawn)

- Taxable brokerage (taxable on dividends/interest and realized gains)

…then you have options.

The underrated part is that you can often meet the same spending need with very different MAGI outcomes.

Example: You need $60,000 for a new car and travel.

Option A: Take $60,000 from the IRA.

That might add roughly $60,000 to taxable income.

Option B: Take $60,000 from brokerage by selling a position with a $45,000 cost basis.

That might create a $15,000 capital gain (plus any dividends), which is a much smaller MAGI impact.

Option C: Take $60,000 from Roth.

Potentially minimal MAGI impact.

None of these is “always best.” The right answer depends on your tax bracket today, your future RMDs, your estate plan, and your long-term goals.

But here’s the point: if you don’t plan withdrawals intentionally, you’ll often default to the IRA because it feels easiest. That’s how IRMAA happens.

This is why our pillar article exists: /post/retirement-withdrawal-strategy-tax-smart-order-of-operations.

Roth conversions and IRMAA: when the surcharge is worth it (and when it’s just sloppy)

Roth conversions are one of the most powerful tools in retirement tax planning. They’re also one of the fastest ways to trigger IRMAA.

I want to separate two situations.

Situation 1: Paying IRMAA on purpose to reduce a bigger future problem

This can be rational when:

- Your IRA is large enough that future RMDs will likely push you into higher tax brackets anyway.

- You expect one spouse to die first, and the survivor will file as single (often higher tax rates at the same income).

- You want to reduce future taxable income to manage Social Security taxation and Medicare costs later.

In those cases, you might accept one or two years of IRMAA as the “cost” of reducing a decade of higher taxes.

Situation 2: Triggering IRMAA because you didn’t coordinate the year

This is the avoidable version:

- You convert a large amount in the same year you sell a property.

- You convert a large amount in the same year you realize big capital gains to rebalance.

- You convert late in the year without checking where MAGI is landing.

A better approach is a multi-year conversion plan where you choose a target income range each year and stop converting when you reach it.

If you want the full multi-year conversion playbook, see: /post/roth-conversions-early-retirement-multi-year-tax-plan.

The questions retirees are asking right now (and my direct answers)

How do large IRAs and brokerage accounts affect my Medicare premiums?

They affect premiums through your tax return.

- Large traditional IRAs create taxable income when you withdraw, and later through RMDs.

- Large brokerage accounts can create taxable dividends/interest every year and taxable capital gains when you sell.

The accounts themselves don’t trigger IRMAA. The income they produce (or that you choose to realize) does.

What income levels trigger IRMAA surcharges for Medicare Part B and Part D?

IRMAA starts when your MAGI exceeds certain thresholds. A commonly cited first threshold is over $218,000 for married filing jointly and over $109,000 for other filing statuses (per SSA guidance). Above those levels, Part B and Part D premiums increase in tiers.

Because the brackets and premium amounts change, I recommend using the SSA chart for the current year and focusing your planning on staying out of the “danger zone” near a threshold unless you’re choosing to cross it.

Can I reduce my Medicare premiums if I have a life-changing event?

Yes, sometimes.

If your income dropped due to certain life-changing events (for example: marriage, divorce/annulment, death of a spouse, work stoppage or reduction, loss of income-producing property, loss/reduction of pension, or employer settlement payment), you can request that Medicare use a more current income estimate.

This is done through Social Security, often using Form SSA-44. Details are here: https://www.ssa.gov/medicare/lower-irmaa.

Important: a market decline by itself is not typically a qualifying life-changing event. And “I retired and my income is lower now” can qualify in some cases (work stoppage), but you need to document it correctly.

How can I plan my retirement income to avoid higher Medicare premiums?

Think in three layers:

- Layer 1: Know what counts in MAGI (IRA withdrawals, Roth conversions, capital gains, dividends/interest, and tax-exempt interest).

- Layer 2: Map the next 3–5 years and mark the lumpy years.

- Layer 3: Choose the funding source (IRA vs brokerage vs Roth) and the timing (this year vs next) to keep income in a controlled range.

If you do only one thing, do this: before any large IRA withdrawal, Roth conversion, or large sale in your brokerage account, estimate your year’s MAGI and check whether you’re near an IRMAA threshold.

Medicare premium planning is also portfolio risk planning (here’s why)

IRMAA planning isn’t just about saving money on premiums. It’s also about avoiding forced moves in your portfolio.

Here’s a common pattern:

- A retiree wants to keep income “low” to avoid IRMAA.

- So they avoid selling appreciated brokerage positions.

- They take more from the IRA instead.

- That increases taxable income anyway, and they still trigger IRMAA.

- Meanwhile, the brokerage account stays concentrated and riskier than it should be.

That’s the worst of both worlds.

A better approach is to treat the portfolio and the tax plan as one system:

- If you need to reduce risk (sell a concentrated position), do it.

- Then plan the sale size and timing so it doesn’t collide with other income items.

- Use rebalancing bands and a multi-year schedule rather than one giant sale.

Sometimes the right answer is: accept one IRMAA year as the cost of fixing a risk problem that could derail your retirement.

Overrated: making every decision to “stay under the line.”

Underrated: deciding which lines matter, and which years you’re willing to cross them for a bigger win.

The appeal option: when IRMAA is unfair and you can fix it

Because of the two-year lookback, IRMAA can be legitimately out of date.

Example:

- In 2024 you had high income because you were still working.

- In 2025 you retired.

- In 2026 Medicare uses 2024 income and charges you IRMAA.

If your income dropped due to a qualifying life-changing event, you may be able to appeal and have premiums reduced.

A few practical notes:

- The appeal is through Social Security, not Medicare.

- You’re typically asking them to use a more current estimate of your income.

- Documentation matters. This is not a “phone call and it’s fixed” situation.

If you’re in the first year or two after retirement and you get an IRMAA notice, it’s worth checking whether an appeal applies.

A practical action list: how to prevent avoidable Part B and Part D surcharges

If you’re within a few years of Medicare or already on Medicare, here’s the checklist I’d use.

1) Put your expected Medicare premiums on the same worksheet as your tax plan.

If premiums aren’t shown next to projected income, IRMAA will always feel like a surprise.

2) Identify your “IRMAA-trigger transactions” before you do them.

Specifically:

- Roth conversions

- Large IRA withdrawals

- Selling a concentrated position

- Selling real estate

- Large mutual fund capital gain distributions (especially in taxable accounts)

3) Create a 3-year rolling plan, not a 1-year plan.

Because of the two-year lookback, you want at least:

- last year (actual),

- this year (in progress),

- next year (planned),

- and you should understand how this year affects Medicare two years from now.

4) If you’re near a threshold, stop “guessing” and start tracking MAGI.

In threshold years, we’ll often track:

- year-to-date realized gains,

- IRA distributions,

- conversion amounts,

- dividend/interest estimates,

- and any one-time income.

5) Don’t let the tax tail wag the investment dog.

If you need to diversify, rebalance, or reduce risk, do it. Just don’t stack it on top of other income spikes if you have a choice.

6) Use the right supporting strategies when they fit.

Depending on your situation, that can include:

- A tax-smart withdrawal order (pillar): /post/retirement-withdrawal-strategy-tax-smart-order-of-operations

- A staged Roth conversion plan: /post/roth-conversions-early-retirement-multi-year-tax-plan

- Capital gains timing and bracket management: /post/capital-gains-planning-retirement-timing-brackets-niiit

- RMD reduction planning before RMD age: /post/rmd-planning-required-minimum-distributions-what-to-do-early

- Social Security tax coordination: /post/social-security-tax-planning-provisional-income

- Medicare enrollment basics and common mistakes: /post/medicare-at-65-high-net-worth-enrollment-costs-mistakes

7) If you received an IRMAA notice after a major life change, explore an appeal.

Use SSA’s guidance and Form SSA-44 when appropriate: https://www.ssa.gov/medicare/lower-irmaa.

The real goal: not “lowest premiums,” but controlled, intentional income

If you take nothing else from this, take this:

IRMAA is not random. It’s math.

And for affluent retirees, it’s usually not solved by a single trick. It’s solved by coordinating:

- which account you spend from,

- when you realize gains,

- how you size Roth conversions,

- when RMDs will hit,

- and how all of that shows up on your tax return.

If you want help turning this into a simple, usable plan, we can build a one-page projection that shows your estimated Medicare premiums alongside RMDs, Roth conversions, capital gains, and Social Security timing for the next 3–5 years.

Book an appointment here: http://grapewealthmanagement.salesmate.io/meetings/#/grapewealthmanagement/user/1