IRMAA Planning for Families: 2026 Medicare Surcharge Calculator

Medicare charges high earners a premium surcharge called IRMAA — and it's based on income from two years ago. The planning window opens well before age 65. Not financial or tax advice; your specifics change the numbers.

What IRMAA is

The Income-Related Monthly Adjustment Amount (IRMAA) is a surcharge Medicare adds to Part B (medical coverage) and Part D (drug coverage) premiums when your Modified Adjusted Gross Income exceeds certain thresholds. It's determined each year by the Social Security Administration using your most recent tax return available — typically two years prior.

For 2026, CMS bases IRMAA on 2024 MAGI. Five income tiers apply; crossing a tier threshold — even by $1 — moves you to the next tier's surcharge for the entire year. The surcharges apply per person, so a couple where both spouses are on Medicare can pay up to $974/month extra on top of the base $202.90 premium.

2026 IRMAA brackets

The 2026 thresholds below are the CMS-published determination brackets. IRMAA is assessed per beneficiary — a married couple each enrolled in Medicare each pays the surcharge separately.

Sources: CMS 2026 Medicare Part B premium announcement; SSA IRMAA determination notice. Part B base premium $202.90 confirmed by CMS CY2026. Tier 4 Part B surcharge ($449.60) estimated from CMS increment pattern — confirm at medicare.gov or with SSA. Thresholds index for inflation annually; 5th tier is frozen through 2028 per ARP.

IRMAA surcharge calculator

Enter your 2024 MAGI and filing status to see your 2026 IRMAA surcharge. If you haven't yet filed 2024 taxes, use your estimated 2024 MAGI.

The Roth conversion cliff: why $1 over a tier costs thousands

IRMAA uses a cliff structure — not a phase-in. If your MAGI crosses a tier boundary by a single dollar, you pay the higher surcharge on 100% of the premium. For a married couple both on Medicare, a $1 income overage can cost:

The practical implication: if your MAGI is $270,000 MFJ and you're considering a $10,000 Roth conversion, that $10,000 conversion won't just cost you the marginal income tax on $10,000 — it could also trigger Tier 2 IRMAA, adding $2,937/year in Medicare surcharges two years later.

Family scenarios where IRMAA planning matters most

Scenario 1: RSU vest + Roth conversion in the same year

A dual-income family with $220,000 in W-2 income decides to do a $50,000 Roth conversion in 2024. Their MAGI: $270,000 — just under the $274,000 Tier 2 threshold. So far, so good (Tier 1 IRMAA only). Then a batch of RSUs vest in December, adding $10,000. MAGI: $280,000 — over the $274,000 threshold. Both spouses on Medicare in 2026 pay Tier 2 instead of Tier 1, costing an extra $2,937/year unexpectedly.

The fix: track MAGI in real time during the year and size conversions to preserve a buffer below tier boundaries. Your brokerage's cost basis tool should show RSU vest values as they happen — this isn't a tax-filing discovery, it's an in-year decision.

Scenario 2: Early retirement Roth conversion window

A family where one earner retires at 60 and the other at 62, both before Medicare eligibility at 65. Their combined income drops from $350,000 to $90,000 in retirement years before Social Security starts. This 5-year window is the Roth conversion opportunity — moving pre-tax 401(k) assets to Roth at 22–24% rates before RMDs force higher withdrawals at 32%+. IRMAA isn't a concern during those low-income years since Medicare hasn't started yet. Once Medicare begins at 65, the 2-year lookback means the conversions done at age 62-63 affect Medicare at 64-65 — so the conversion window effectively closes 2 years before Medicare eligibility.

Scenario 3: Home sale + conversion in the same year

A family sells a home with $600,000 in gain. The first $500,000 of gain is excluded under IRC §121 (MFJ). The remaining $100,000 is recognized as income. Combined with their $200,000 household income, total MAGI hits $300,000 — pushing them from no-IRMAA into Tier 2 ($274,001+). They weren't planning to be in IRMAA that year. If this happens in 2024, it affects 2026 Medicare. The IRC §121 exclusion doesn't help with the IRMAA calculation since the recognized gain adds to MAGI.

Scenario 4: IRMAA lookback from a one-time income event

A Roth conversion, large bonus, or business sale in a single year doesn't create a permanent IRMAA tier — it only affects the two years where that income appears in the lookback. Families who experience a one-time income spike can appeal to SSA using a life-changing event to get IRMAA adjusted if their income has since dropped significantly.

Life-changing event appeals

If you're assessed IRMAA based on a prior year's income that no longer reflects your current situation, you can appeal using SSA Form SSA-44 (Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event). Qualifying events:

• Marriage, divorce, or death of a spouse
• Work stoppage or reduction (retirement, layoff)
• Loss of income-producing property (business sale, rental sale)
• Receipt of a settlement from an employer (not investment income)
• Reduction or cessation of pension payments

You provide a more recent tax return or evidence of income change, and SSA can adjust the determination. This doesn't apply to one-time income events like a Roth conversion — that income is real income, and conversions are excluded from qualifying life-changing events. The appeal works best for genuine income reductions (retirement, job loss, divorce).

IRMAA planning strategies for families in their 50s

Strategy 1: Stay-under targeting in conversion years

Run your MAGI projection in October/November before year-end. Identify how much room you have before the next IRMAA tier. Size your Roth conversion to use up that space without crossing. This becomes a recurring year-end discipline for families doing multi-year conversion schedules.

Strategy 2: Coordinate large income events with conversion pauses

If you know a home sale, RSU acceleration, or bonus is coming in a given year, consider pausing or reducing Roth conversions that year to contain total MAGI. The 2-year IRMAA lookback means you can plan this 2+ years in advance with reasonable visibility.

Strategy 3: Qualified charitable distributions after 70½

Once you turn 70½, QCDs reduce MAGI dollar-for-dollar (up to $111,000/year in 2026).³ If RMDs are pushing your income into an IRMAA tier, QCDs directed to charity come out of the IRA and don't hit MAGI. This is a primary reason charitably inclined families with significant IRAs use QCDs rather than taking the RMD as income and then writing a check.

Strategy 4: Asset location and Roth timing

A well-structured Roth conversion strategy built in your 50s — before Social Security and RMDs start — reduces the IRMAA-inflating income you'll face in your 70s. Pre-tax IRA balances that haven't been converted will generate RMDs starting at age 73 (or 75 if born in 1960 or later per SECURE 2.0), stacking on top of Social Security to push MAGI into higher tiers. Systematic conversion during low-income years flattens that distribution.

Strategy 5: Bunching income in IRMAA-friendly years

Not all years are equal. Years when one spouse has lower income (parental leave, sabbatical, early retirement before the other spouse), or years with above-average deductions (large charitable contributions, medical expenses), have more IRMAA headroom. Bunching income events into those years rather than spreading them uniformly can keep you in lower tiers across more Medicare years.

IRMAA vs. base premium: the full picture

For a married couple both on Medicare with Tier 2 IRMAA ($274,001–$342,000 MFJ):

• Part B: $406.90/month × 2 people = $813.80/month combined
• Part D: ~$37.50/month × 2 = $75.00/month combined (actual Part D premium varies by plan)
• Part A: generally free if you've worked 40+ quarters
• Total out-of-pocket Medicare premiums: ~$888.80/month — before deductibles and cost-sharing

Families with significant retirement income often underestimate healthcare costs in retirement. The standard rule of thumb is $300,000+ for a couple's lifetime healthcare costs — that estimate often doesn't fully account for IRMAA tiers that high earners are likely to land in.

When to work with a fee-only advisor on IRMAA planning

The math is straightforward for a single year. The complexity multiplies when you're coordinating: Roth conversion size, Social Security claiming timing (delays maximize survivor benefit but keep you working longer, with income), RMD projections across two large IRAs, a possible business sale or home sale, and charitable giving strategy — all of which interact with IRMAA in the same 2-year lookback window.

Fee-only advisors who specialize in pre-retirement family planning run multi-year MAGI projections as a standard service — not to sell you an annuity or product, but to optimize the tax and IRMAA-cost trajectory across the household. If you're 55–65 with substantial pre-tax retirement accounts, this analysis is worth doing before the conversion window closes.

1. Kiplinger — Medicare Premiums 2026: IRMAA Brackets and Surcharges for Parts B and D. 2026 Part B base premium $202.90; IRMAA surcharges per tier for Parts B and D; MFJ threshold $218,000 for Tier 1.
2. The Finance Buff — 2026 Medicare IRMAA Premium MAGI Brackets. Income brackets for all five IRMAA tiers, single and MFJ; 2-year lookback explained.
3. MedicareResources.org — What is IRMAA?. SSA Form SSA-44 life-changing event appeal process; QCD interaction with MAGI; $111,000 QCD limit 2026 per IRS Notice 2026-03.
4. IRS — Qualified Charitable Distributions. QCDs exclude up to $111,000 from MAGI (2026); eligibility age 70½; excludes DAFs and private foundations.
5. CMS — 2026 Medicare Parts B and D Premiums and Deductibles. Official CMS fact sheet confirming base Part B premium $202.90 and IRMAA surcharge structure for CY2026.

2026 IRMAA thresholds and Part B/D surcharges verified against CMS CY2026 fact sheet and Kiplinger. Tier 4 Part B surcharge ($449.60) estimated from CMS increment pattern — verify at medicare.gov before planning. QCD limit $111,000 confirmed per IRS Notice 2026-03. Values current as of June 2026 — thresholds adjust annually for inflation.