Question 1

What is IRMAA and how does it affect my Medicare premiums?

Accepted Answer

IRMAA stands for Income-Related Monthly Adjustment Amount. It's a surcharge added to your Medicare Part B and Part D premiums when your Modified Adjusted Gross Income (MAGI) exceeds certain thresholds. The catch is that Medicare uses your tax return from two years prior — so your 2025 premiums are based on your 2023 income. A single high-income year (from a Roth conversion, property sale, or large RMD) can trigger thousands in additional Medicare costs that you won't see coming for two years.

Question 2

When do I need to enroll in Medicare?

Accepted Answer

Most people must enroll in Medicare Part A and Part B during the Initial Enrollment Period: the 7-month window surrounding your 65th birthday (3 months before, the month of, and 3 months after). Missing this window results in permanent late-enrollment penalties — 10% more per year for Part B, for as long as you have Medicare. If you're still on employer coverage, different rules apply. Timing matters: enrolling in Medicare while still on a health savings account (HSA) can also trigger tax complications.

Question 3

Can I appeal an IRMAA surcharge?

Accepted Answer

Yes. If you experienced a "life-changing event" — such as retirement, divorce, death of a spouse, reduction in work hours, or loss of pension income — you can file Form SSA-44 to request that Medicare use a more recent, lower income year instead of the two-year lookback. The Social Security Administration accepts these appeals. However, the appeal must be based on a qualifying life event, not just general income reduction. Planning ahead to avoid the surcharge entirely is better than appealing after the fact.

Question 4

What is the difference between Medicare Advantage and Medicare supplement (Medigap)?

Accepted Answer

Medicare Advantage (Part C) replaces Original Medicare with an all-in-one private plan that typically includes Part D prescription coverage. Premiums are often low or zero, but you pay copays and are limited to a network of providers. Medicare Supplement (Medigap) works alongside Original Medicare to cover costs Medicare doesn't — like deductibles and coinsurance — and lets you see any doctor who accepts Medicare nationwide. The right choice depends on your health, travel habits, and income. Note: you generally can't switch from Medicare Advantage back to a Medigap plan without medical underwriting.

Question 5

How does my retirement income plan affect my Medicare costs?

Accepted Answer

Every major income decision in retirement has a two-year delayed effect on your Medicare premiums. A Roth conversion that's too large, a capital gain from selling property, or a higher-than-expected RMD can all push your MAGI above IRMAA thresholds — adding hundreds per month to your Medicare costs. This is why Medicare planning must be integrated with your tax strategy, not handled separately. We coordinate Roth conversions, asset sales, and withdrawal sequencing with IRMAA thresholds to keep your Medicare costs predictable.

Filing Status	MAGI Threshold	Monthly Part B Premium
Single or MFS	$106,000 or less	$185.00 (standard)
Single	$106,001 – $133,500	$259.00
Single	$133,501 – $167,000	$370.00
Single	$167,001 – $200,000	$480.90
Single	$200,001 – $500,000	$591.90
Single	Above $500,000	$628.90

Your Income Decisions Today Set Your Medicare Costs Two Years From Now

IRMAA: The Medicare Surcharge Nobody Tells You About

2025 IRMAA Thresholds (Based on 2023 Tax Return)

Roth Conversions & IRMAA

Life-Changing Events

Capital Gains Planning

Enrollment Timing

Medicare Doesn't Exist in a Vacuum

Tax Strategy

Retirement Planning

Long-Term Care

Medicare Planning Questions

Don't Let Your Tax Return Decide Your Medicare Costs