Medicare IRMAA Explained for California Retirees

A Medicare bill can feel surprisingly personal when it is based on a tax return from two years ago. That is the frustration behind many calls about Medicare IRMAA explained: a person may be retired now, living on a very different income, yet still see an extra charge on their Medicare costs. The good news is that IRMAA follows a defined set of rules, and in some situations, it can be reconsidered.

Medicare IRMAA explained: the basic rule

IRMAA stands for Income-Related Monthly Adjustment Amount. It is an additional monthly charge paid by higher-income Medicare beneficiaries. It applies to Medicare Part B and Medicare Part D prescription drug coverage.

Most people pay the standard Medicare Part B premium. If the Social Security Administration determines that your income is above a certain threshold, it adds IRMAA to that premium. If you have a standalone Part D plan or drug coverage through a Medicare Advantage plan, a separate Part D IRMAA may apply as well.

IRMAA is not an insurance plan, a penalty for choosing the wrong coverage, or a charge imposed by your Medicare Advantage or Medicare Supplement carrier. It is a Medicare income surcharge determined by the Social Security Administration, generally using information from the IRS.

That distinction matters. You can change Medicare plans during an eligible enrollment period, but changing plans usually does not make IRMAA disappear. The surcharge is tied to your income, not whether you selected Original Medicare, a Medicare Advantage plan, or a particular drug plan.

Why Medicare uses an older tax return

Medicare generally uses your modified adjusted gross income, often called MAGI, from two years earlier to decide whether you owe IRMAA. For example, a Medicare premium decision for 2026 would generally be based on your 2024 federal tax return.

For IRMAA purposes, MAGI is generally your adjusted gross income plus tax-exempt interest income. That means income from sources such as retirement account withdrawals, capital gains, certain investment income, and tax-exempt bond interest can affect the calculation. The exact result depends on your federal tax return and filing status.

This two-year lookback is practical for the government, but it can feel disconnected from real life. Perhaps you sold a longtime home in Los Angeles, exercised stock options before retirement, received a large bonus, or took a one-time distribution from a retirement account. Those events can increase income for one tax year without reflecting what you can comfortably spend each month now.

A higher Medicare premium does not automatically mean someone made a mistake. Still, it is worth checking whether the income used is accurate and whether a qualifying life change has reduced your current income.

Who may pay IRMAA?

IRMAA affects individuals and couples whose income exceeds Medicare's annual income thresholds. The thresholds and surcharge amounts are adjusted periodically, so it is best to review the figures for the year you will be paying premiums rather than relying on an older chart.

Your tax filing status matters. The income ranges for single filers, married couples filing jointly, and people who are married but file separate tax returns are not the same. Married filing separately can lead to especially different IRMAA treatment, which is one reason couples should speak with a qualified tax professional before making filing decisions based solely on Medicare premiums.

It also helps to remember that each spouse is assessed individually. A married couple may both receive IRMAA determinations because the decision is based on the household income reported on their joint federal return. Even if only one spouse has Medicare, the household's reported income can still matter.

What IRMAA changes in your monthly budget

The Part B surcharge is added to the standard Part B premium. The Part D surcharge is added separately, even if your prescription coverage is included in a Medicare Advantage plan. In many cases, you continue paying your plan's regular premium to the plan, while the Part D IRMAA is billed through Social Security or added to your Medicare bill.

This can create confusion because people see more than one charge. A Medicare Advantage plan might have a low or even $0 plan premium, but that does not erase the standard Part B premium or any IRMAA that applies to you. Likewise, a Medicare Supplement policy can help with many out-of-pocket medical costs, but it does not pay your Part B or Part D IRMAA surcharge.

IRMAA also differs from a late enrollment penalty. A late enrollment penalty can result from delaying Part B or Part D enrollment without qualifying coverage. IRMAA is based on income. They are separate issues, and a person could potentially have one, both, or neither.

When you can ask Social Security to reconsider IRMAA

If the tax return Medicare used no longer reflects your financial situation because of a qualifying life-changing event, you may be able to request a new determination. Social Security uses Form SSA-44, Medicare Income-Related Monthly Adjustment Amount - Life-Changing Event, for this purpose.

Common qualifying events include:

• Marriage, divorce, or the death of a spouse

• Work reduction, work stoppage, or loss of income-producing property

• Loss or reduction of certain pension income

• A settlement payment from a current or former employer because of that employer's closure or bankruptcy

Retirement is one of the most common situations. If you stopped working after the tax year Medicare is using, your current or expected income may be substantially lower. You can provide supporting documents, such as a letter from an employer, recent pay information, pension statements, or a signed copy of a more recent tax return, depending on your circumstances.

The request is not automatic, and approval depends on the facts and documentation. But it is absolutely worth exploring when a qualifying event occurred. Do not assume you must keep paying a surcharge based on a year that no longer resembles your household's finances.

What to do when the determination arrives

Read the Social Security notice carefully. It should show the tax year used, your reported income category, the surcharge amount, and your appeal or reconsideration options. First, confirm that the filing status and income information appear correct. A tax return error, outdated IRS information, or a filing-status issue deserves attention.

Next, ask whether your income dropped because of one of Social Security's recognized life-changing events. A market decline or a general feeling that expenses are higher may be financially difficult, but those circumstances alone do not necessarily meet the reconsideration standard. A documented work stoppage, divorce, or loss of pension income is a different matter.

If you plan to request reconsideration, gather records before submitting anything. Clear documentation can help Social Security understand both what changed and when it changed. Keep copies of your notice, tax returns, employer or pension letters, and any submitted forms.

You should also continue handling your Medicare premiums while the matter is under review unless Social Security gives you different instructions. Ignoring the bill can create a separate problem, especially for Part D coverage.

Plan choices still matter, even with IRMAA

It can be discouraging to learn that IRMAA is not solved by switching Medicare plans. Yet your plan choice still has a major effect on your overall healthcare budget.

For someone in West Hollywood, Palm Springs, or elsewhere in Southern California, the right review looks beyond a plan's advertised premium. Your doctors, preferred hospitals, prescription list, pharmacy options, travel habits, and comfort with referrals can all change the real cost of coverage. A lower-premium plan is not always lower cost if it disrupts access to a specialist or places a key medication in an expensive coverage tier.

This is also where an independent advisor can be helpful. At Campanelli Insurance Services, the conversation is not just about a carrier's brochure. It is about how your coverage, income-related Medicare charges, household priorities, and care preferences fit together. There is no added fee for that guidance, and support should not end once enrollment is complete.

A careful word about income planning

Because IRMAA is income-based, some people consider changing retirement withdrawals, selling investments differently, or adjusting charitable giving. Those decisions can have tax, estate, cash-flow, and investment consequences far beyond Medicare. Avoid making a major financial move simply to avoid one surcharge without discussing it with a tax professional or financial advisor who understands your full picture.

For example, a one-time Roth conversion can raise income and potentially trigger IRMAA later, but it may still make sense for a household's longer-term tax strategy. On the other hand, a large withdrawal made without planning can produce a Medicare surprise two years down the road. The right answer depends on your goals, not on a single premium line.

A Medicare surcharge should never leave you feeling that you have to figure it out alone. Keep the notice, look at the tax year behind it, and ask whether your life has changed enough to justify a review. A calm conversation and the right paperwork can turn a confusing charge into a clear next step.