If you’re enrolled in Medicare (or enrolling soon), you may hear the term IRMAA and wonder what it means for your budget. IRMAA can be confusing because it’s tied to taxes, shows up after you’ve already made income decisions, and can change from year to year.
Below is a clear, planning-focused guide—especially helpful for retirees and near-retirees along the Grand Strand, including the Myrtle Beach area, and also useful no matter where you live.
Quick Answer: What is IRMAA?
IRMAA stands for Income-Related Monthly Adjustment Amount. It’s an additional premium that some higher-income Medicare beneficiaries pay on top of their standard Medicare costs.
IRMAA can apply to:
- Medicare Part B (doctor visits, outpatient care)
- Medicare Part D (prescription drug coverage)
You don’t “sign up” for IRMAA. If Medicare determines you’re subject to it, you’ll be notified and the extra amount is typically deducted from Social Security (or billed directly if you’re not collecting Social Security yet).
Who pays IRMAA?
You may pay IRMAA if your Modified Adjusted Gross Income (MAGI) is above certain thresholds.
Medicare generally looks at your tax return from two years prior to determine IRMAA. For example, your Medicare premiums for this year are usually based on income from two years ago.
What counts toward MAGI for IRMAA?
MAGI for IRMAA is generally your Adjusted Gross Income (AGI) plus tax-exempt interest (commonly from municipal bonds). AGI itself can include items like:
- Wages (if you’re still working)
- Pension income
- IRA distributions
- Social Security (partially taxable depending on your overall income)
- Capital gains
- Interest and dividends
- Roth conversions (important planning item)
How IRMAA is determined (and why it can surprise people)
IRMAA is based on income brackets—crossing a threshold by even a small amount can increase premiums for the year.
Common situations that can trigger IRMAA unexpectedly include:
- Selling a home or second property with a capital gain
- Large IRA withdrawals in a single year
- Roth conversions (which increase taxable income)
- Required Minimum Distributions (RMDs) beginning later in retirement
- High investment income in a strong market year
Because the calculation uses a two-year lookback, the premium impact often arrives after the income event has passed—when it’s harder to “undo” the decision.
How much does IRMAA cost?
IRMAA adds a surcharge to your Part B premium and also affects Part D with an additional monthly amount.
The exact dollar amounts and income brackets can change each year. What matters for planning is the concept: as income rises, Medicare premiums may rise, too, and those increases can be meaningful over 12 months—especially for couples.
If you want a precise estimate for your situation, it’s usually best to review:
- Your most recent tax return
- Upcoming income events (property sales, large withdrawals, conversions)
- A multi-year retirement income plan
Can you appeal IRMAA?
Yes—in certain situations.
If your income is now lower due to a “life-changing event,” you may be able to request that Social Security use a more current year’s income data. Examples can include:
- Retirement or reduced work hours
- Marriage, divorce, or death of a spouse
- Loss of income-producing property
- Employer settlement changes
This is not automatic; it typically requires documentation and a formal request. Results vary, and it’s important to respond promptly if you believe you qualify.
Practical planning strategies to help manage IRMAA
No strategy eliminates IRMAA in every case, and it’s not always advisable to avoid it at all costs. But there are several planning moves that may help reduce surprises and keep income more predictable.
1) Coordinate withdrawals across account types
Many retirees have a mix of:
- Tax-deferred accounts (traditional IRA/401(k))
- Taxable brokerage accounts
- Tax-free accounts (Roth IRA)
A thoughtful withdrawal approach may help manage taxable income year to year—particularly before RMDs begin.
2) Plan Roth conversions carefully
Roth conversions can be a powerful long-term planning tool, but they increase taxable income in the year of conversion—potentially triggering IRMAA.
Instead of converting a large amount at once, some retirees consider spreading conversions over multiple years. The trade-off: smaller annual conversions may reduce the chance of jumping brackets, but also may take longer to execute the strategy. The “best” approach depends on tax rates, future RMD projections, and cash-flow needs.
3) Watch one-time income events
If you’re considering a significant transaction—like selling an appreciated property—ask in advance how it could affect:
- Your tax bill
- Your Medicare premiums (IRMAA)
- Net proceeds and long-term cash flow
For many retirees in coastal markets (including areas around Myrtle Beach), property decisions can have outsized tax consequences due to appreciation.
4) Review tax-exempt interest (it still counts for IRMAA)
Tax-exempt municipal bond interest may be excluded from federal income tax, but it can still be included in MAGI for IRMAA calculations. This doesn’t mean munis are “bad”—it just means they should be evaluated in the context of your overall income picture.
5) Use multi-year planning (not just a single tax year)
IRMAA planning works best when you zoom out. A multi-year view can help you align:
- Retirement date and income drop
- Social Security claiming strategy
- RMD timing
- Major purchases or charitable goals
Key takeaway
IRMAA is Medicare’s way of adjusting premiums based on income. The most important thing to know is that big income years can lead to higher Medicare premiums two years later, so proactive planning can reduce surprises.
If you’re approaching Medicare enrollment or already receiving benefits, it may be worth reviewing your tax return and upcoming income decisions to understand whether IRMAA could apply—and what options you have.
This article is for educational purposes only and is not tax or legal advice. Medicare rules and income thresholds can change. Consider working with qualified professionals regarding your specific situation.