Key Takeaways

• IRMAA only applies to postal retirees if their income exceeds specific thresholds and is tied directly to Medicare Parts B and D.
• The PSHB transition does not change how IRMAA is calculated or paid; it’s set by federal law and reviewed each year.

When it comes to Medicare costs, income can play a big role for postal retirees. The Income Related Monthly Adjustment Amount (IRMAA) is often misunderstood—especially with the introduction of the Postal Service Health Benefits (PSHB) program. Let’s separate facts from myths and help you make informed decisions without any surprises.

What Is IRMAA for Postal Retirees?

Definition of IRMAA

IRMAA stands for Income Related Monthly Adjustment Amount. It’s an extra charge on top of your standard Medicare Part B (and sometimes Part D) premium if your income exceeds set limits. IRMAA isn’t a penalty; it’s based strictly on the income you reported to the IRS two years prior. Not every retiree pays IRMAA—only those whose income is above certain thresholds.

Who is affected under PSHB?

If you’re a postal retiree or an eligible family member enrolling in PSHB, IRMAA might apply if your yearly income exceeds these federal Medicare thresholds. The PSHB program, which replaced FEHB for USPS retirees starting in 2025, requires most Medicare-eligible postal retirees to enroll in Part B. This means understanding your IRMAA risk is more important than ever for you.

Connection to Medicare Parts B and D

You may pay IRMAA for both Medicare Part B and Part D coverage. This adjustment is separate from your standard PSHB or FEHB premium, and it goes directly to Medicare. The Social Security Administration usually deducts IRMAA from your Social Security benefit; if you don’t receive Social Security, they’ll bill you directly. IRMAA is not collected by OPM, USPS, or your PSHB plan.

How Is IRMAA Calculated in 2026?

Income thresholds for 2026

For 2026, IRMAA thresholds are set by federal law and updated yearly. These thresholds look back at your 2024 federal tax return (modified adjusted gross income). If your modified adjusted gross income is above a certain amount, you’ll receive an IRMAA notice. These limits are the same for all Medicare beneficiaries, whether in PSHB, FEHB, or not connected to federal employment.

Sources of data for IRMAA

The Social Security Administration (SSA) determines if you owe IRMAA. SSA uses IRS data from two years prior. For 2026, your 2024 income is reviewed. Most commonly, this is based on your adjusted gross income plus tax-exempt interest. You don’t need to self-report—SSA and the IRS exchange data automatically.

Adjustment timelines and notifications

If you owe IRMAA, the SSA will send you a written notice. This typically happens toward the end or start of the new year as they receive your latest IRS records. The notice details the IRMAA amount and gives you instructions for appeal if you believe it’s in error. If your income decreases due to a life-changing event, you may be able to request a reduction.

Common Myths About IRMAA

Myth: All postal retirees pay IRMAA

Many believe that all postal retirees moving to PSHB must pay IRMAA. In reality, IRMAA applies only if your income is above the threshold. Most retirees on average pensions and Social Security alone do not pay IRMAA.

Myth: IRMAA is permanent

You might hear that once added, IRMAA never goes away. In fact, SSA reviews your income each year. If your income falls below the threshold (for example, after retirement or a one-time event), the adjustment can be removed the following year.

Myth: PSHB changes how IRMAA works

Some think that PSHB rules make IRMAA different for postal retirees. The truth is, IRMAA calculations and processes are the same for everyone with Medicare Parts B or D, regardless of PSHB enrollment. The only change for postal retirees in 2026 is that more will be required to enroll in Part B, making IRMAA potentially more common, but not different in nature.

What Are the Facts About IRMAA?

Who sets the IRMAA rules?

Federal law sets Medicare and IRMAA rules. The Centers for Medicare & Medicaid Services (CMS) administers the program, while the Social Security Administration manages IRMAA determination and billing. These agencies explain IRMAA thresholds and processes in public, regularly updated documents.

Impact of PSHB transition

The PSHB transition, completed January 1, 2025, now requires most Medicare-eligible postal retirees to enroll in Medicare Part B. This change does not create IRMAA or modify its calculations. Instead, it increases the likelihood that eligible retirees will enroll in Medicare and therefore may be affected by IRMAA if they have high income.

Steps if you disagree with your IRMAA

If you think your IRMAA is too high—perhaps because your income has dropped due to retirement, divorce, or other qualifying events—you can file an appeal with SSA. This involves submitting Form SSA-44 and proof of your income change. The appeals process is standardized for all Medicare beneficiaries and never handled by USPS or OPM.

Does IRMAA Affect FEHB or PSHB Premiums?

Medicare premium vs. PSHB premium

Your PSHB premium is separate from your Medicare premiums. IRMAA is an additional charge on your Medicare Part B (and sometimes Part D) premium. It does not change what you pay for your PSHB insurance or what is deducted from your annuity.

No double-payment rule

You do not pay IRMAA twice. If you’re enrolled in both Medicare and PSHB, IRMAA applies only to your Medicare coverage. There is no double billing, and PSHB or OPM will not collect IRMAA on behalf of Medicare.

Where IRMAA is paid

SSA usually withholds IRMAA from your Social Security payment. If you do not receive Social Security, SSA will bill you directly. IRMAA is always paid to Medicare, never to your PSHB or FEHB administrator.

How Can I Avoid Mistakes About IRMAA?

Check your income reporting

Double-check your annual tax filings with the IRS since this information is used to determine IRMAA. Review your Social Security statements and keep records of major life changes (like retirement or spousal death) that could affect your income level and, by extension, your IRMAA status.

Guidelines for appeals

If you receive an IRMAA notice but believe it isn’t correct, review SSA’s guidelines for life-changing event appeals. Completing Form SSA-44 with supporting documentation gives you the best chance of having your IRMAA adjusted.

Seeking reputable, neutral help

Rely on official government guidance (from SSA, OPM, or CMS) or seek help from a neutral retirement benefits counselor. Avoid unofficial sources or anyone promising to erase IRMAA for a fee, as these are not supported by federal programs and could put you at risk.