What Is IRMAA? Medicare Premiums for Higher-Income Beneficiaries

Social Security sent a letter showing a Part B premium higher than your neighbor's. The explanation referenced something called IRMAA tied to a tax year you barely remember filing. The surcharge applies to Part B and Part D regardless of which Advantage carrier logo is on your member card.

That letter lands constantly for retirees in Florida and Georgia who thought Medicare premiums were one flat number until the first year after a big bonus, stock sale, or Roth conversion.

IRMAA is not a penalty. It is not a mistake. It is a surcharge Congress added in 2007 so higher-income beneficiaries pay a larger share of Part B and Part D program costs. Social Security calculates it from tax data. Medicare Advantage carriers cannot waive it. Shopping Humana versus UnitedHealthcare does not make it disappear.

IRMAA follows the beneficiary's Medicare and income circumstances. Switching from one Medicare Advantage carrier to another does not remove an applicable IRMAA charge.

This post is the IRMAA mechanics wire: two-year lookback, 2026 brackets, Part D add-ons, and life-changing event appeals. It is not our turning 65 enrollment guide. If you need FEHB stacking detail, read Medicare and FEHB for federal retirees.

What is IRMAA and who pays it?#

IRMAA is an income-related surcharge Social Security adds to Part B and Part D when your modified adjusted gross income crosses CMS thresholds, roughly 8% of Medicare beneficiaries pay it.

Most people pay the standard Part B premium only. In 2026 that standard amount is $202.90 per month (CMS). Beneficiaries whose MAGI exceeds tier thresholds pay the standard premium plus an additional monthly amount.

For 2026 premiums, Social Security generally uses 2024 modified adjusted gross income because Medicare typically relies on a tax return from two years earlier. MAGI is generally adjusted gross income plus tax-exempt interest. Married couples filing jointly compare household MAGI to the joint-filer thresholds below.

Source: CMS 2026 Medicare Parts B premiums fact sheet.

Part B IRMAA is added to the standard Part B premium and determines your total Part B monthly amount. Part D IRMAA is a separate income-related charge associated with Part D coverage and is in addition to the Part D plan premium itself (whether through a standalone Part D plan or a Medicare Advantage plan that includes Part D).

IRMAA applies whether you use Original Medicare, Medigap, or Medicare Advantage. A zero-premium Advantage plan does not erase the Part B premium or Part B IRMAA. Social Security deducts the applicable Part B amount from your benefit check or bills you directly.

How is IRMAA calculated for Medicare Part B and Part D?#

Social Security uses MAGI from your federal tax return about two years earlier, 2024 return data drives 2026 Part B and Part D IRMAA tiers.

Modified adjusted gross income generally equals adjusted gross income plus tax-exempt interest. Social Security receives data from the IRS and applies CMS tier tables for your filing status.

Part B and Part D have separate IRMAA charges, but both use the same MAGI and tax-filing information to determine the applicable income tier. Your carrier, billing method, or plan type does not change the IRMAA tier itself.

Married filing separately has a compressed bracket structure when you lived with your spouse during the tax year. Run married-joint versus married-separate math with a qualified tax advisor before you file a return that Medicare will read two years later.

These costs are separate. A $0-premium Medicare Advantage plan does not eliminate the Part B premium or any applicable Part B IRMAA.

When comparing Medicare Advantage plans, include IRMAA in your total annual-cost calculation rather than comparing plan premiums and extras alone. Total exposure still includes drug tiers and medical cost sharing.

Can IRMAA surcharges change if my income drops?#

If a qualifying life-changing event has reduced your income, you can request a new IRMAA determination rather than waiting for the normal tax-return lookback cycle.

Social Security can reconsider an IRMAA determination when a beneficiary experiences a qualifying life-changing event and provides required information on SSA Form SSA-44. SSA recognizes events such as marriage, divorce, death of a spouse, work stoppage, work reduction, loss or reduction of pension income, and employer settlement or payment. Certain losses of income-producing property may qualify under SSA's rules; a routine sale of property or an investment does not automatically qualify. Each request requires documentation. Approved determinations use more recent income rather than the two-year-old return.

Without an approved request, IRMAA follows the normal lookback cycle. Income that spiked in 2024 can affect 2026 premiums even if you retired in 2025 and earn far less now.

Florida and Georgia retirees often sell businesses or coastal properties in the same year they enroll in Medicare. MAGI spikes collide with Initial Enrollment Period timing. If you control transaction timing, talk to a tax professional before the tax year Medicare will later read.

Should I verify my doctors and pharmacy before locking in a plan?#

Yes. IRMAA changes what you pay Medicare each month, not whether your doctors accept your Advantage plan ID for the upcoming contract year.

Annual Enrollment Period is when Advantage and Part D plans renew with new directories and formularies. Auto-renew keeps your plan ID but not necessarily your specialist network. Search Medicare Plan Finder for the 2027 contract year and call billing offices for confirmation. See also our Medicare guides hub, Medicare tools hub, and Medicare glossary.

I'd push back on the assumption that higher premiums buy network stability. IRMAA is unrelated to carrier contracts. Your cardiologist can leave the network while your Part B surcharge stays elevated.

Southeast planning notes IRMAA letters skip#

Deferred compensation payouts and lump-sum vacation payouts from federal or state employers can push a single year into higher tiers. Coastal Florida property sales with large capital gains show up on 2024 returns and surface as 2026 IRMAA letters.

Spousal coordination gets messy fast. For married couples filing jointly, the household's MAGI is compared with the joint-filer thresholds. If the couple crosses an IRMAA threshold, each Medicare beneficiary's applicable Part B and Part D IRMAA can increase. Separate filing has its own Medicare bracket structure. Household budgeting needs a tax advisor, not a brochure.

IRMAA is unrelated to Medicaid or Extra Help. Low-income subsidy programs use different income tests. You can age into Medicare IRMAA while a spouse qualifies for other programs.

I hear retirees assume IRMAA is a one-year blip. The effect can continue into future Medicare premium years until the income used by Social Security falls out of the applicable lookback period. Medicare generally uses a two-year lookback, so a high-MAGI tax year can still matter after that year's income has dropped.

What to do when the letter arrives#

Confirm which tax year SSA used. The letter states it explicitly. I tell clients to circle that year on the letter before they compare MAGI to the CMS bracket table for their filing status on SSA.gov.

If a life-changing event fits, download SSA-44 and gather proof before you call Social Security. Phone waits are long. Local office appointments help.

Re-run plan comparisons including total premium stack, not just Advantage extras. IRMAA is not something I can broker away as an independent agent. Focus plan efficiency on formulary tiers, hospital cost sharing, and Medigap letter choice instead.

Roth conversions and the two-year MAGI trap#

A Roth conversion increases taxable income and MAGI in the conversion year. Medicare generally uses a two-year lookback, so that higher MAGI can affect a future Medicare premium year. The effect may persist until the applicable income year falls out of the lookback calculation.

A 64-year-old who converts a large amount at retirement may see IRMAA-related premium increases at 66 even when current income is mostly Social Security plus a small pension.

Because Roth conversions can affect future Medicare premiums, people approaching Medicare should consider the potential IRMAA effect when evaluating the timing and size of a conversion and discuss tax strategy with a qualified tax professional.

Advantage, Medigap, and IRMAA stacking#

IRMAA sits on Part B regardless of path. Medigap premiums are separate and do not include IRMAA. Medicare Advantage plan premiums are separate too. Part D plan premiums and Part D IRMAA are also separate from Part B charges.

A beneficiary comparing Plan G versus Advantage should add Part B premium, Part B IRMAA, Part D premium, and Part D IRMAA to the spreadsheet before comparing medical cost sharing. IRMAA is based on income and Medicare rules, not on which carrier you select.

Zero-premium Advantage marketing often ignores IRMAA entirely. Your Social Security deduction can still show the full Part B amount, including any applicable Part B IRMAA, even when the Advantage plan itself charges $0.

SSA-44 life-changing events, documentation checklist#

Work stoppage or work reduction requires proof that employment income dropped. Divorce needs a decree and income documentation. Death of a spouse requires supporting records. Loss or reduction of pension income or an employer settlement may qualify with SSA-required proof.

For loss of income-producing property, SSA applies specific criteria; gather whatever documentation SSA requests for that event type. Gather IRS transcripts, pension statements, and termination letters before you visit SSA. Incomplete SSA-44 packets can delay recalculation for months while the higher premium remains in place.

Next steps#

Official bracket tables live on CMS.gov and SSA.gov. For enrollment timing around retirement income changes, read turning 65 Medicare enrollment. For plan comparisons with total exposure, use Medicare Plan Finder and our Medicare cost comparison tool.

Schedule a consultation or call (850) 613-0057 for a no-cost review of your premium stack. Phone or video.

Licensed in Florida, Alabama, Georgia, and North Carolina. Independent, not tied to one carrier.

Plan availability, networks, drug formularies, and benefits vary by county and year. For all options in your area, contact Medicare.gov or 1-800-MEDICARE (TTY: 1-877-486-2048).