Retirement Hub · Social Security

How Social Security and Medicare Interact in 2026

Your income — even from two years ago — can quietly raise your Medicare premiums by hundreds of dollars a month. Here’s what you need to know before you retire.

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The short answer

Social Security and Medicare are separate programs, but they interact in two important ways: if you’re already collecting Social Security at 65, Medicare Part B enrollment is automatic. And if your income exceeds certain thresholds, Social Security deducts higher-than-standard Part B premiums from your monthly benefit — a surcharge called IRMAA — based on your income from two years prior.

The enrollment connection: does Social Security sign you up for Medicare?

The answer depends on whether you’re already collecting Social Security when you turn 65.

Already collecting Social Security? Enrollment is automatic.

If you began collecting Social Security retirement or disability benefits at least four months before your 65th birthday, the Social Security Administration automatically enrolls you in Medicare Part A and Part B. Your red, white, and blue Medicare card arrives in the mail about three months before your birthday month. You don’t have to do anything to trigger it.

Important detail: Because you must pay a premium for Part B, you have the option to decline it — but only if you have other qualifying coverage (such as an employer group plan for a business with 20 or more employees). Declining Part B without qualifying coverage starts the clock on a lifetime late enrollment penalty. Learn more about Social Security timing.

Not yet collecting Social Security at 65? You must enroll manually.

If you delay Social Security past 65 — which many people do to maximize their benefit — Medicare does not automatically find you. You must actively enroll in Medicare Part A and Part B during your 7-month Initial Enrollment Period: the three months before, the month of, and the three months after your 65th birthday month. Missing this window without qualifying coverage can mean permanent premium penalties and coverage gaps.

This is one of the most common mistakes I see: someone delays Social Security to 70 for maximum income, but forgets to separately enroll in Medicare at 65. They assume one triggers the other. It does not — and the Part B late enrollment penalty adds 10% to your premium permanently for every 12-month period you were eligible but didn’t sign up.

Medicare premiums deducted from Social Security: how it works

Once you are enrolled in both Social Security and Medicare Part B, the Social Security Administration automatically deducts your Part B premium from your monthly benefit check. No separate bill, no action required on your part — it just comes out.

In 2026, the standard Part B premium is $202.90 per month. That’s the amount most people see deducted. But if your income exceeds certain thresholds, you pay more — sometimes significantly more.

If you’re not yet collecting Social Security but are enrolled in Medicare, you will receive a quarterly bill from CMS for your Part B premium. The automatic deduction only kicks in once you begin receiving Social Security benefits.

What about Medicare Advantage giveback plans?

Some Medicare Advantage plans offer a Part B “giveback” benefit that reduces your monthly premium deduction — meaning your Social Security check may be slightly higher if you’re enrolled in one of these plans. It’s worth knowing it exists, though the plans vary significantly by county and carrier. A free review can show you what’s available in your area.

IRMAA: when a higher income from two years ago raises today’s Medicare bill

This is the interaction that surprises people most — including plenty of people who would consider themselves financially savvy.

IRMAA stands for Income-Related Monthly Adjustment Amount. It’s a surcharge applied to Medicare Part B and Part D premiums for beneficiaries whose Modified Adjusted Gross Income (MAGI) exceeds certain thresholds. The catch: the surcharge is based on your income from two years prior.

In 2026, that means the SSA is looking at your 2024 tax return. If your 2024 income was above $109,000 (individual) or $218,000 (married filing jointly), you’re paying more for Medicare — and the surcharge comes directly out of your Social Security check.

The cliff effect is real: IRMAA brackets are not gradual. One dollar over a threshold triggers the full surcharge for that entire tier — potentially adding $1,000 or more per year per person. A Roth conversion, a home sale, or a one-time IRA distribution can push you into a bracket you never expected.

2026 IRMAA brackets: Part B

Individual MAGI	Joint MAGI	Monthly Part B Premium	Monthly Surcharge
$109,000 or less	$218,000 or less	$202.90	None
$109,001–$137,000	$218,001–$274,000	$284.10	+$81.20
$137,001–$171,000	$274,001–$342,000	$405.80	+$202.90
$171,001–$205,000	$342,001–$410,000	$527.50	+$324.60
$205,001–$499,999	$410,001–$749,999	$649.20	+$446.30
$500,000 or more	$750,000 or more	$689.90	+$487.00

Source: CMS 2026 Medicare Parts A & B Premiums and Deductibles. Surcharges apply per person — a married couple both on Medicare pays the surcharge twice.

Part D IRMAA surcharges

IRMAA also applies to Part D (prescription drug coverage) using the same income brackets. In 2026 those surcharges range from $14.50 to $91.00 per month on top of your plan’s regular premium. Like Part B, this amount is deducted directly from your Social Security check.

For a married couple both on Medicare at the first IRMAA tier, the combined annual impact is roughly $2,300 in additional Part B premiums plus Part D surcharges — on top of their standard premium costs. At higher tiers the number grows substantially.

The two-year lookback: why this creates retirement timing problems

Here’s what makes IRMAA especially frustrating in practice: it uses income data from two years ago, which means your Medicare costs in the first year or two of retirement may reflect your working income — not your retirement income.

I’ve worked with people who retired in late 2024 with a significantly lower income, only to find their 2026 Medicare premiums were still based on what they earned in 2024 while working full time. The program has no way of knowing your income dropped until the IRS provides updated data — which takes two years.

Income events that commonly trigger IRMAA surcharges

Large Roth IRA conversions Converting a significant portion of a traditional IRA to a Roth raises your MAGI in that tax year — and two years later, your Part B and Part D premiums reflect it.

Sale of a home or investment property Capital gains from a real estate sale can spike your MAGI well above thresholds in a single year, triggering a one-time but significant IRMAA year.

Large required minimum distributions (RMDs) As RMDs grow with your account balance and age, they can push joint income over IRMAA thresholds unexpectedly — especially when both spouses have their own retirement accounts.

Working into your late 60s If you continue working while on Medicare, your earned income is included in MAGI and can keep you in IRMAA brackets even as your Medicare costs feel especially unfair on a “still working” budget.

You can appeal IRMAA — and many people don’t know this

If your income has dropped significantly since the lookback year used to calculate your IRMAA surcharge, you are not stuck with it. The SSA allows you to appeal using Form SSA-44, which requests a Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event form.

Qualifying life-changing events include:

Events that may qualify for IRMAA appeal: retirement or reduced work hours, marriage or divorce, death of a spouse, loss of income-producing property (such as a rental), loss of pension, or employer settlement. You do not automatically get an appeal — you have to file.

An approved appeal adjusts your premium to reflect your current income rather than the two-year-old figure on file. For many new retirees, this can mean recovering hundreds of dollars per month.

The process requires supporting documentation — your most recent tax return, a benefit statement, or other income verification depending on your event type. If you believe you qualify, don’t wait: file as soon as your circumstances change, not at the end of the year.

How Social Security claiming age interacts with Medicare enrollment

The decision of when to claim Social Security — at 62, at your full retirement age, or as late as 70 — is independent of Medicare enrollment. But the timing has downstream effects worth understanding.

Claiming before 65

If you claim Social Security at 62, you’ll be collecting benefits for three years before Medicare kicks in at 65. During that window, you need to arrange your own health coverage — through a spouse’s employer plan, COBRA, or the ACA marketplace. This is a meaningful planning gap that catches people off guard. Learn more about healthcare costs in retirement.

Delaying Social Security past 65

If you delay Social Security beyond 65 to maximize your benefit, you must still enroll in Medicare Part A and Part B at 65 (unless you have qualifying employer coverage). Medicare and Social Security enrollment timelines are separate. Don’t assume delaying one affects the other. Learn more about Social Security timing.

The IRMAA window: manage income before Medicare starts

Because IRMAA looks back two years, the income you earn or recognize at ages 63 and 64 will directly determine your Medicare costs at 65 and 66. This is one of the most underappreciated income-planning windows in retirement. A Roth conversion at 63 can mean higher Medicare premiums at 65. Recognizing income gradually instead of in a lump sum can keep you in a lower IRMAA bracket — or out of IRMAA entirely.

The planning window matters most in the two years before Medicare starts. That’s when income decisions — Roth conversions, asset sales, retirement account distributions — have the most direct impact on what you’ll pay for Medicare on day one.

What to do if you’re approaching Medicare eligibility

Confirm your enrollment status early If you’re already collecting Social Security before 65, watch for your Medicare card in the mail at around 64 years and 9 months. If you’re not collecting, mark your calendar — your IEP opens three months before your 65th birthday.

Look up your IRMAA status If your income in the past two years exceeded $109,000 (individual) or $218,000 (joint), you likely have or will receive an IRMAA notice from the SSA. Review it carefully — the bracket can sometimes be reduced with income documentation.

File Form SSA-44 if your income has dropped If you’ve retired, been widowed, or had another qualifying life change, don’t wait for IRMAA to self-correct in two years. File for a reconsideration using current income documentation.

Coordinate with a Medicare advisor before your plan decision The IRMAA bracket you’re in can affect which Medicare plan makes the most financial sense — especially if you’re comparing a Medicare Supplement to Medicare Advantage. Get a full picture before you choose.

Not sure how this applies to your situation?

I’m an independent Medicare advisor — not tied to any insurance company. I’ll walk you through your IRMAA status, enrollment timing, and every plan available to you, at no cost to you.

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Cindy Kowalski is a licensed independent Medicare advisor (NPN 21601670) licensed in 22 states. This content is for educational purposes only and does not constitute legal, tax, or financial advice. Medicare plan availability, premiums, and benefits vary by location and change annually. IRMAA brackets and Part B premiums are based on 2026 CMS data and 2024 income lookback. For personalized guidance, consult a licensed advisor. Not affiliated with or endorsed by the Centers for Medicare & Medicaid Services or the Social Security Administration. Find official information at Medicare.gov and SSA.gov.