How Medicare and Social Security Work Together

Most people think of Medicare and Social Security as two separate programs that happen to arrive at roughly the same stage of life. In practice, they are quite connected. The decisions you make about one will directly affect how you experience the other. Here is what that relationship actually looks like and why understanding it before you retire is worth your time.

When should you enroll?

Social Security and Medicare have different default enrollment rules and confusing them is one of the most common mistakes people make in the year they turn 65.

If you are already collecting Social Security benefits before you turn 65, you will most likely be automatically enrolled in Medicare Parts A and B. Your Medicare card will arrive in the mail roughly three months before your 65th birthday and typically the only action you need to take from here is signing up for a Medicare Advantage or Supplement plan.

If you have not yet claimed Social Security and are waiting to begin your benefit at a later age, you are responsible for enrolling in Medicare on your own. That enrollment window opens three months before the month you turn 65, includes the month in which you turn 65, and closes three months after. Missing it without qualifying for a Special Enrollment Period can result in permanent late enrollment penalties on your Part B premium.

Delaying Social Security is often smart from a pure income maximization standpoint, but it requires you to be much more proactive about Medicare enrollment than if you had already claimed Social Security earlier.

Medicare Premiums

The most direct connection between Medicare and Social Security has to do with premium payment for Part B of Medicare. If you are receiving Social Security benefits when you are first eligible for Medicare you have the option to have your Medicare Part B premium automatically deducted from your Social Security benefit. 

This sounds straightforward, but it creates an extra level of planning. Your Social Security benefit is fixed based on your earnings history and the age at which you claimed, increasing with your cost-of-living adjustment. Your Medicare Part B premium, however, can change every year. When your Part B premiums rise faster than your cost-of-living adjustment, there can be times when your net monthly deposit from Social Security can shrink even though your gross benefit technically increased.

This is something to be aware of throughout retirement and can explain moments in which your Social Security net deposits decrease while your Social Security benefit is increasing. 

What is IRMAA and how does it impact you? 

Higher-income beneficiaries pay more for Medicare Part B and Part D coverage. This surcharge is called the Income Related Monthly Adjustment Amount, or IRMAA, and it is based on your modified adjusted gross income from two years prior to your Medicare coverage year.

That two-year lookback is the detail that surprises people most. If you retire at 65 and your income drops significantly, Medicare will still be pricing your premium based on what you earned at age 63. If you had a high-earning year (i.e. a business sale, a large Roth conversion, or significant capital gain), this can push you into a higher IRMAA bracket even if your current income was unchanged.

There are five IRMAA brackets above the standard premium, and the surcharges are not trivial. A couple in the highest bracket pays well over $500 per person per month for Part B alone, before any Part D surcharge is added. 

The important thing here is that IRMAA is not permanent. It recalculates every year based on the prior two-year income, so if you have one year of high income it should readjust automatically for the following year. IRMAA can be appealed as well. If you experience a qualifying life event (retirement being the most common) you can appeal your IRMAA determination with the Social Security Administration, using the drop of income as your reasoning. That appeal process involves submitting a form, as well as supporting documentation, and it could lead to a significant reduction in premium costs.

Balancing Roth Conversions 

When considering Roth Conversions, the effects of premium increases with IRMAA can be a large factor in the decision. Converting traditional IRA funds to a Roth account generates taxable income in the year in which the conversion occurs. If that income pushes your modified adjusted gross income above an IRMAA threshold, you will pay a higher Medicare premium two years later. The tax efficiency of the conversion may still make it worthwhile, but the Medicare cost should be part of the considerations when doing this analysis.

This is especially relevant in the early years of retirement, when many are in a lower tax bracket, before Social Security and required minimum distributions kick in. Those years can be an attractive window for conversions, but those conversions can affect your Medicare premiums drastically a few years down the line. 

Social Security Claiming Age

Waiting to claim Social Security until age 70 produces the highest possible monthly benefit. If you retire at age 65 or younger and are delaying Social Security, you are looking at a number of years during which you are funding Medicare and doing so without the supplemental income from Social Security to cover your premium costs.

This period is where income management matters most for IRMAA purposes. Large distributions, portfolio rebalancing events, or one-time distributions may help you pay for costs associated with Medicare now, but can greatly affect your IRMAA down the road. Through reviewing your individual circumstance with your advisor, they can help you to best coordinate your income needs with the long-term impact on your portfolio and on your premium amounts.

For many people, especially those in good health, delaying Social Security could be the right move. It’s important to recognize the strategy does not exist in isolation though. It intersects with health coverage costs, IRMAA exposure, and how the income that you draw during those years can affect you down the line. 

Social Security and Medicare are not simply checklist items that get resolved in the year you turn 65. The decisions around both programs touch nearly every other part of a retirement plan including tax projections, investment withdrawals, spending flexibility, and estate planning.

If you are within five to ten years of retirement and have not stress-tested how these two programs interact in your specific situation, our team at Corbett Road Wealth Management can help provide clarity and direction on the best steps to take for your specific situation.

---

IMPORTANT DISCLOSURES

This post was created with the assistance of AI tools for research and drafting.  It was reviewed, edited, and fact-checked by Camilla Carvalho before publication.  Please verify any critical information.

These materials are provided for general information and educational purposes based upon publicly available information from sources believed to be reliable—we cannot assure the accuracy or completeness of these materials. The information in these materials may change at any time and without notice.

Spire Wealth Management, LLC is a Federally Registered Investment Advisory Firm. Securities offered through an affiliated company, Spire Securities, LLC., a Registered Broker/Dealer and member FINRA/SIPC.