Medicare IRMAA Surcharge: 5 Critical Facts to Avoid Costly Premiums | Fed Pilot

The short answer: Medicare IRMAA is an income-related surcharge added to your Part B and Part D premiums when your modified adjusted gross income crosses federal thresholds. In 2026 it can apply once income tops $109,000 for an individual or $218,000 for a couple, and medical deductions do not lower it.

Key Takeaways

• The standard 2026 Part B premium is $202.90 per month, up from $185.00 in 2025 (source: CMS).
• IRMAA surcharges generally begin above $109,000 in income for individuals or $218,000 for joint filers (source: Medicare.gov).
• IRMAA is set from your tax return two years earlier, so your 2024 income drives 2026 surcharges (source: SSA).
• Itemized medical deductions can lower taxable income but generally do not reduce the MAGI used for IRMAA (source: SSA/IRS).
• A qualifying life-changing event may let you ask for a lower surcharge using Form SSA-44 (source: SSA).

How Does the Medicare IRMAA Surcharge Work in 2026?

The Medicare IRMAA is an extra amount added on top of your base Part B and Part D premiums. Most enrollees pay the standard 2026 Part B premium of $202.90 a month, according to the Centers for Medicare & Medicaid Services. Higher-income beneficiaries pay more.

The surcharge is tiered. As your income rises through the brackets, the Medicare IRMAA amount rises with it. The first tier in 2026 starts above roughly $109,000 for a single filer and $218,000 for a married couple filing jointly, per Medicare.gov.

One detail surprises many federal retirees: the surcharge often overlaps with the Part B late-enrollment penalty. They are separate charges, and it is possible to owe both at the same time.

Why Do Medical Deductions Not Lower Your IRMAA?

IRMAA is based on modified adjusted gross income, not on taxable income. Itemized medical expenses are a deduction that reduces taxable income further down the tax return. They sit below the line that determines your MAGI.

Because of that ordering, large medical write-offs may cut your income tax bill yet leave your IRMAA tier unchanged. This is a common point of confusion in the first years of retirement, when out-of-pocket costs can be high.

Income sources that can push MAGI higher include TSP withdrawals, Roth conversions, the taxable share of Social Security, and capital gains. Timing those events may be one possibly useful way to keep income under a threshold in a given year.

What Income Counts Toward the IRMAA Thresholds?

The Social Security Administration uses your MAGI from the tax return filed two years earlier. For 2026 surcharges, that generally means your 2024 return. A one-time income spike two years ago can therefore raise a premium today.

MAGI adds tax-exempt interest back to your adjusted gross income. Municipal bond interest, for example, still counts. The SSA benefits planner lists the current brackets and the premium tied to each one.

How Can Federal Retirees Reduce an IRMAA Surcharge?

If your income has dropped because of a life-changing event, you can ask SSA to use more recent income instead. Qualifying events include retirement, marriage, divorce, the death of a spouse, and loss of pension income.

The request is made on Form SSA-44, with documentation of the event and the expected lower income. Many newly retired federal employees may qualify, because leaving federal service usually reduces earned income.

Beyond the appeal, some retirees look at multi-year income planning. Coordinating TSP withdrawals with your Social Security claiming decision and any FEHB and Medicare choices can influence which Medicare IRMAA tier you land in each year.

How Are the IRMAA Brackets Structured?

IRMAA is not a single fee. It rises in steps as income climbs. Each step adds a set dollar amount to your Part B and Part D premiums.

The first tier begins just above the base threshold. The top tier applies to the highest incomes. Crossing a line by even one dollar can move you into the next tier.

This cliff effect is why timing matters. A single large withdrawal can push you over a bracket for one year. The next year, if income falls, you usually drop back down.

Many retirees map their income against the brackets each fall. That review can flag a year when a small change avoids a bigger Medicare IRMAA charge.

How Can Roth Conversions Affect IRMAA?

Roth conversions add to your income in the year you convert. That can raise your MAGI. A large conversion may lift you into a higher IRMAA tier two years later.

Still, converting during lower-income years can help long term. Roth withdrawals later are generally tax-free. They also do not count toward MAGI for future IRMAA.

So the trade-off is a possible short-term surcharge against long-term flexibility. Some retirees convert in smaller amounts across several years. That approach can keep each year under a bracket line.

There is no single right size. The math depends on your tax rate now versus later.

What Records Should You Keep for IRMAA?

Good records help if you ever need to appeal. Keep your recent tax returns. Keep any documents that show a drop in income.

Proof of a life-changing event is especially useful. That includes a retirement letter, a divorce decree, or a death certificate for a spouse. SSA may ask for one.

Also keep the annual notice Medicare sends about your premium. It states your IRMAA tier for the year. If it looks wrong, you have a starting point to question it.

Organized records can turn a stressful Medicare IRMAA dispute into a manageable one.

How Does IRMAA Affect Married Couples?

For couples, income is measured on the joint return. Both spouses’ income counts toward the threshold. That can surprise households with two pensions.

If both spouses are on Medicare, each can face a separate surcharge. The tier is based on the shared income, but the extra amount applies to each premium.

When one spouse dies, the survivor often files as single later. The single thresholds are lower. That shift can raise the surcharge even as household income falls.

Planning for that transition is one way couples prepare for future Medicare IRMAA costs.

How Can You Plan Around IRMAA Each Year?

A yearly rhythm can help. In the fall, estimate your income for the current year. Compare it against the published brackets. Look for any line you are close to crossing.

If you are near a threshold, small moves may help. You might delay an extra TSP withdrawal. You might spread a Roth conversion across two years. You might harvest gains in a lower-income year instead.

Remember the two-year lookback. The income you shape today sets your Medicare IRMAA two years from now. Planning ahead is the whole game.

Also revisit your plan after big life events. Retirement, a spouse’s death, or a large sale can all change your tier. A quick check can catch a surcharge before it lands.

None of this is a guarantee. But a steady annual review gives you the best chance to keep Medicare IRMAA under control.

Frequently Asked Questions

Is the Medicare IRMAA surcharge permanent?
No. IRMAA is recalculated every year from your most recent tax data, so a lower-income year can move you back down a tier the following year.

Does IRMAA apply to Part A?
No. IRMAA applies to Part B and Part D premiums. Most people pay no premium for Part A.

Do both spouses pay IRMAA?
If both spouses are enrolled in Medicare and the household income is above the joint threshold, each spouse can owe a separate surcharge on their own premium.

Does FEHB coverage remove IRMAA?
No. Keeping FEHB does not change IRMAA. The surcharge is tied to income and Medicare enrollment, not to your federal health plan.

How do I appeal an IRMAA determination?
You can file Form SSA-44 for a life-changing event, or request a formal reconsideration if you believe SSA used outdated or incorrect income data.

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