This Social Security Rule Hits Boomers Hardest After You Stop Working

Many baby boomers expect their costs to drop once work income ends. But Medicare premiums can rise after retirement if your past earnings were high, which can disrupt a stress-free retirement.

The rule behind this is called the income-related monthly adjustment amount, or IRMAA. Medicare looks at your income from two years earlier, so a high-earning year before you retired can lead to higher Part B and Part D premiums long after your paychecks stop.

Here's how IRMAA works, why it often shows up after you leave work, and what you can do if the surcharge is based on income you no longer have.

How IRMAA works

IRMAA is an income-based surcharge that increases what you pay for Medicare. It applies to Part B and Part D premiums and is added on top of the standard amounts.

In 2026, the surcharge begins when modified adjusted gross income (MAGI) exceeds $109,000 for single filers or $218,000 for married couples filing jointly. The extra charge rises in steps as income increases, so moving into a higher tier can raise monthly premiums by a noticeable amount.

Most sources of retirement income count, including withdrawals, investment gains, and one-time transactions. That's why a single high-income year, even if it isn't typical, can trigger higher premiums later.

When IRMAA applies, the added cost is usually automatic. The Social Security Administration (SSA) generally deducts Part B premiums, including any surcharge, directly from your Social Security benefit. As a result, the impact often appears as a smaller deposit rather than a separate bill.

Why IRMAA often hits after you stop working

The lookback year is the main reason IRMAA surprises so many retirees. Medicare sets premiums using income reported on your tax return from two years earlier, not what you earn today.

Some workers, for instance, may reach peak earnings in their final years on the job. If you retire in 2024, your income may drop right away, but your 2026 Medicare premiums will still be based on your 2024 return. Until the calculation updates, the surcharge can continue even though your current income is lower.

Early retirement can also bring new income sources that raise MAGI unexpectedly. Required minimum distributions (RMDs), which begin at age 73, count fully as taxable income. Large IRA withdrawals, Roth conversions, capital gains from selling investments or property, or a change in filing status after the loss of a spouse can all push income into an IRMAA tier.

Common IRMAA triggers retirees can miss

Even if your ongoing retirement income looks moderate, certain one-time events can push your MAGI high enough to trigger a surcharge later:

• A final-year bonus, severance, or payout when you retire
• Large IRA withdrawals taken to cover major expenses or bridge to a later claiming age
• Roth conversions, which count as income in the year you convert
• Required minimum distributions, especially if account balances are large
• Big capital gains from selling investments or property
• A change in filing status, such as the loss of a spouse, which lowers IRMAA thresholds

Because of the two-year lookback, a temporary increase in income can lead to higher Medicare premiums long after the spike has passed.

What to do if IRMAA is based on income you no longer have

IRMAA isn't always set in stone. If your income has dropped because of certain life changes, you may be able to ask Social Security to base your premium on a more current estimate instead of the lookback year.

Retirement, for instance, is one of the most common qualifying events. If you stop working and your income falls, you can request a new determination by filing Form SSA-44 (Medicare Income-Related Monthly Adjustment Amount - Life-Changing Event). You'll identify the event, provide documentation, and estimate your current-year income.

Other qualifying events include the death of a spouse, divorce, a significant pension reduction, or the loss of income-producing property. The key is that your income must be meaningfully lower than what Medicare is currently using.

If your surcharge is being driven by income that has already disappeared, it's worth reviewing the appeal process sooner rather than later. If Social Security approves the request, your premiums can be reduced going forward, and in some cases, you may be refunded for overpayments.

Bottom line

IRMAA is easy to overlook because it shows up late and is based on past income. A high-earning year near retirement, or a one-time spike from things like a Roth conversion or large withdrawal, can raise your Medicare premiums long after your income has fallen.

If you're approaching retirement, it's worth paying attention to what counts toward MAGI and which events could push you into a higher tier. And if your income has already dropped, you may be able to ask Social Security to adjust your premiums so they reflect what you're actually earning.

Knowing how IRMAA works allows you to plan with clearer expectations, make the right moves, and reduce the risk of unexpected reductions in your monthly benefit.

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