This article is educational and not individualized tax, legal, or insurance advice. All premium and threshold figures reflect the 2026 Medicare plan year as published by the Centers for Medicare & Medicaid Services on November 14, 2025; 2026 surcharges are determined from income reported on 2024 federal tax returns.
TL;DR — Quick Verdict
- One dollar of excess income costs $974.40 per person per year. A single filer at $109,000 of 2024 modified adjusted gross income pays $202.90 a month for Medicare Part B in 2026; at $109,001 the premium jumps to $284.10 — no phase-in.
- The full 2026 IRMAA surcharge range runs from $81.20 to $487.00 per month on Part B, plus $14.50 to $91.00 per month on Part D, per person.
- A married couple where both spouses are enrolled and both land in the top tier pays $18,706.80 in combined 2026 Part B and Part D charges before a single office visit.
- Comparison result: married filing separately is the costliest status. Above $109,000 there are no middle tiers — the Part B premium goes straight to $649.20 a month, versus $284.10 for a single filer at the same income.
- Medicare uses a two-year lookback, so the 2026 return you file next spring sets your 2028 premium. Recommendation: model every Roth conversion, property sale, and required distribution against the threshold table before executing, and file Form SSA-44 if a qualifying life-changing event has already cut your income.
Roughly 8% of Medicare Part B enrollees pay an income-related monthly adjustment amount, according to CMS — and most of them did not see it coming. The mechanism is unusual among federal charges: it is not a tax on the marginal dollar but a cliff that reprices twelve months of coverage the instant modified adjusted gross income crosses a line. Cross the first 2026 threshold by a single dollar and Medicare Part B costs $974.40 more for the year, per person.
What makes the surcharge so difficult to plan around is the two-year lookback. Your 2026 premium comes from your 2024 tax return — the year you may have sold a rental property, converted an IRA at Fidelity or Vanguard, or taken a lump-sum severance. Retirement income planning software from firms like eMoney and MoneyGuidePro now models these thresholds explicitly for exactly this reason.
This article lays out every 2026 bracket from the CMS fact sheet, calculates the true annual cost at each tier for both individuals and couples, compares filing statuses head to head, and identifies the five mistakes that trigger avoidable surcharges. Every figure traces to CMS or the Social Security Administration.
The 2026 IRMAA Brackets and What Each Tier Actually Costs
CMS set the standard 2026 Part B premium at $202.90 a month, up $17.90 from $185.00 in 2025 — a 9.7% increase. Above the first threshold, five surcharge tiers apply. The table below converts each monthly figure into the annual cost that matters for retirement withdrawal strategy comparison.
Premium and surcharge amounts: Centers for Medicare & Medicaid Services, 2026 Medicare Parts A & B Premiums and Deductibles, November 14, 2025. Annual per-person column calculated by Real Cost Report as (Part B surcharge + Part D surcharge) × 12.
Read that last column carefully, because it is the number missing from most coverage. Publishers quote the monthly premium; retirees write annual checks. A couple in tier three where both spouses are enrolled pays $5,769.60 in combined surcharges for the year — money that comes out of the same portfolio funding their retirement savings targets by age and income.
One structural detail deserves emphasis: the income thresholds and the dollar amounts move at different speeds. The first-tier threshold rose about 2.8% for 2026, from $106,000 to $109,000 for single filers. The surcharge amounts rose roughly 9.7%, tracking program spending. Thresholds indexed slower than costs mean the surcharge captures more people over time, at higher amounts.
How the Two-Year Lookback Turns Old Income Into Today’s Premium
Consider a specific case. James and Diane, both 66, retired in mid-2025. Their current income is $94,000 — well under every threshold. But in 2024, James’s final year of work, they reported $291,000: $148,000 in wages, an $88,000 Roth conversion executed in December, and $55,000 from selling a lake cottage.
The Social Security Administration reads the 2024 return. In 2026 both spouses land in tier three: $405.80 monthly for Part B, plus $37.50 for Part D, each. Their combined Medicare cost is $886.60 a month — $2,884.80 per person in surcharges above the standard premium, or $5,769.60 for the household. That is 6.1% of their current annual income, charged against money they no longer earn.
Modified adjusted gross income for this purpose means adjusted gross income plus tax-exempt interest. Municipal bond income does not escape it. Wages, pensions, capital gains, dividends, traditional IRA withdrawals, and every dollar of a conversion count. Qualified Roth distributions do not, which is the entire strategic case for pre-Medicare conversions covered in our analysis of Roth conversion costs, tax hit, and timing.
The timing asymmetry runs in both directions. Because Medicare looks back two years, income realized at age 63 sets the premium at 65. Aggressive conversion advice that ignores this hits a wall two years earlier than most retirees expect. It also means the return you file for 2026 determines your 2028 premium — planning capacity you have right now, and lose permanently once the year closes.
The surcharge follows you regardless of how coverage is delivered. Enrollees in Medicare Advantage plans from UnitedHealthcare, Humana, or Aetna owe identical amounts, billed by Medicare rather than the plan. A $0-premium Medicare Advantage plan does not shelter anyone from an income-related monthly adjustment amount.
Filing Jointly vs Filing Separately: Which Is Better for a Married Couple Near the Threshold?
Married couples sometimes file separately for reasons unrelated to Medicare — income-driven student loan repayment, liability separation during a divorce, or a large medical deduction. The Medicare consequence is severe and frequently unmodeled.
For couples who lived together at any point during the tax year but filed separately, CMS applies a compressed schedule with no middle tiers. Above $109,000, the Part B premium goes directly to $649.20 a month — the same rate a joint filer pays at $410,001.
Bracket assignments from Centers for Medicare & Medicaid Services, 2026 Medicare Parts A & B Premiums and Deductibles. Household totals modeled by Real Cost Report assuming both spouses enrolled in Part B and Part D for twelve months.
Verdict
For Medicare-enrolled couples above $109,000 of individual modified adjusted gross income who live together, filing jointly wins decisively — $6,940.80 cheaper per year in this scenario. Separate filing only makes sense when the tax or loan-repayment benefit exceeds that figure, which is rare. The exception worth taking seriously: spouses who genuinely live apart are not subject to the compressed schedule and should confirm their status before filing. If a divorce is in progress, the Medicare cost belongs in the settlement math alongside the divorce impact on retirement accounts and QDROs.
What Most Retirees Get Wrong About the IRMAA Surcharge
Five errors account for the majority of avoidable surcharges. Each has a specific cost and a specific correction.
Mistake 1: Treating the threshold as a phase-in
Retirees assume crossing a line taxes only the excess, as marginal income tax brackets do. Consequence: a $500 December dividend reinvestment pushes MAGI from $108,800 to $109,300 and costs $1,148.40 per person for the year — a 230% effective rate on that $500. Correction: track projected MAGI monthly from October, and defer discretionary income realization into January when the year is running close.
Mistake 2: Converting to the top of a tax bracket instead of the top of a Medicare tier
Conversion calculators optimize against the 22% or 24% federal bracket, which does not align with $109,000 or $137,000. Consequence: a technically correct conversion triggers a surcharge that erases years of tax savings. Correction: run both constraints, and cap the conversion at whichever ceiling is lower. Compare against a Roth vs traditional IRA by tax bracket analysis before committing.
Mistake 3: Ignoring required minimum distributions in the projection
Distributions begin automatically and grow as a percentage of the balance. Consequence: retirees comfortably below the threshold at 73 breach it at 78 without changing a single decision. Correction: project the full distribution schedule to age 85 using the RMD calculation and tax costs framework, then identify the breach year and convert in advance of it.
Mistake 4: Assuming a one-time spike can be appealed
Form SSA-44 covers eight life-changing events: marriage, divorce or annulment, death of a spouse, work stoppage, work reduction, loss of income-producing property, loss of pension income, and employer settlement payment. Consequence: retirees who sold a house or converted an IRA file an appeal and lose. Correction: understand that voluntary income events do not qualify — they simply wait out the two-year window.
Mistake 5: Forgetting the surcharge is per person
Published tables list monthly amounts per beneficiary. Consequence: couples underestimate the household cost by exactly half. Correction: double every figure when both spouses are enrolled, and treat the surcharge as a joint household expense in the withdrawal plan.
Is Managing Around the Surcharge Worth the Effort?
Not for everyone. The answer depends on where projected modified adjusted gross income sits relative to the nearest threshold and on how much flexibility the portfolio allows.
Skip the exercise if projected MAGI stays below roughly $95,000 single or $190,000 joint with no large one-time events on the horizon. The margin absorbs normal variation, and the planning cost outweighs the risk. Retirees drawing primarily on Social Security and a modest taxable account generally fall here — average retired-worker benefits reached $2,071 a month in January 2026 after the 2.8% cost-of-living adjustment, according to the Social Security Administration, which alone does not approach any threshold.
Take it seriously if any of four conditions holds. First, projected MAGI lands within $15,000 of a threshold — the zone where a dividend, a capital gain distribution, or a mistimed withdrawal decides the outcome. Second, a Roth conversion of any size is planned. Third, a property sale, business sale, or deferred compensation payout is scheduled. Fourth, required distributions from tax-deferred balances above roughly $1.5 million are approaching, which interacts with Social Security claiming age and lifetime income decisions.
Return on effort is unusually high in the second group. Keeping a couple below the first threshold preserves $2,296.80 a year — for perhaps three hours of projection work. Across a twenty-year retirement with tier amounts rising near 9.7% annually, avoiding a single persistent tier is a six-figure decision. Those still accumulating should also weigh how catch-up contribution limits after 50 reduce current MAGI while building the balances that later drive distributions.
The uncomfortable case is the retiree already in a tier due to income that no longer exists. If a qualifying life-changing event caused the drop, Form SSA-44 with supporting evidence and a current-year income estimate can reset the determination retroactively to the start of the year. For a couple at the first tier, a granted request returns $2,296.80. If no qualifying event applies, the only remedy is time — and attention to what the current year’s return will produce two years out, particularly for anyone earned income effects on Social Security benefits also affect.
Frequently Asked Questions
Does the IRMAA surcharge apply to Medicare Advantage enrollees?
Yes. CMS applies identical income-related monthly adjustment amounts regardless of whether coverage comes through Original Medicare, a Medicare Advantage plan, or a standalone Part D plan. A beneficiary in the first tier pays $284.10 monthly for Part B plus $14.50 for Part D even if the Medicare Advantage plan premium itself is $0. Medicare bills the amount directly, usually as a Social Security deduction.
Do tax-exempt municipal bonds help avoid the surcharge?
No. Modified adjusted gross income for Medicare purposes equals adjusted gross income plus tax-exempt interest, so municipal bond income is added back in full. A retiree earning $30,000 of muni interest counts every dollar toward the $109,000 single threshold. Municipal bonds still reduce federal income tax, but they provide no shelter from an income-related monthly adjustment amount.
How much did the surcharge increase for 2026?
CMS raised the standard Part B premium 9.7%, from $185.00 in 2025 to $202.90 in 2026, and surcharge amounts rose at a similar rate. Income thresholds increased about 2.8%, from $106,000 to $109,000 for single filers and $212,000 to $218,000 for joint filers. Costs climbing faster than thresholds means more beneficiaries face surcharges each year.
Can a Qualified Charitable Distribution reduce exposure?
Yes, and it is one of the few clean tools available. A Qualified Charitable Distribution from a traditional IRA satisfies a required minimum distribution without adding to adjusted gross income, unlike a withdrawal followed by a charitable deduction. For a retiree projected $8,000 above the $109,000 threshold, an $8,000 Qualified Charitable Distribution can preserve $1,148.40 in annual Medicare cost while funding the same gift.
How We Researched This Article
Every premium, threshold, deductible, and surcharge amount in this article comes from the Centers for Medicare & Medicaid Services fact sheet 2026 Medicare Parts A & B Premiums and Deductibles, published November 14, 2025 and effective for the 2026 calendar year. We transcribed the Part B full-coverage table, the married-filing-separately table, and the Part D income-related monthly adjustment amount table directly from that document rather than from secondary summaries, then cross-checked each row against the published amounts a second time before drafting.
Cost-of-living adjustment and average benefit figures come from the Social Security Administration’s 2026 Cost-of-Living Adjustment Fact Sheet, which reports a 2.8% adjustment and an estimated average retired-worker benefit of $2,071 monthly in January 2026. Rules governing modified adjusted gross income composition, the two-year lookback, and Form SSA-44 life-changing events were confirmed against Social Security Administration guidance at ssa.gov and beneficiary-facing documentation at Medicare.gov.
Three categories of figures in this article are modeled rather than measured, and we distinguish them explicitly. The annual per-person surcharge column multiplies published monthly amounts by twelve, assuming full-year enrollment in both Part B and Part D. Household totals for couples double the per-person figure, assuming both spouses are enrolled for twelve months. The James and Diane scenario and the filing-status comparison are constructed illustrations using real 2026 bracket assignments applied to hypothetical income; no individual taxpayer data was used.
Limitations worth stating. Part D plan premiums vary by plan and region, so total Part D cost cannot be stated as a single national figure — only the surcharge, which is fixed by law, appears here. Beneficiaries with Part B immunosuppressive-drug-only coverage face a separate schedule not covered in this analysis. The 2027 thresholds had not been published by CMS at the time of writing; CMS typically releases the following year’s figures in mid-November. Research was last conducted July 2026.
All figures were verified against named primary sources before publication.