Medicare part B and Part D IRMAA

Medicare Part B and Part D IRMAA: What It Is and How It Affects Your Costs

If you’re enrolled in Medicare or planning to enroll soon, you may have heard the term IRMAA. Understanding IRMAA is essential because it can impact your monthly costs for Medicare Part B and Part D. Let’s break it down in simple terms.

What Is IRMAA?

IRMAA stands for Income-Related Monthly Adjustment Amount.

It’s an additional charge added to your Medicare Part B and Medicare Part D premiums if your income exceeds a certain threshold.

• IRMAA is not a separate plan.
  
• It is not a penalty.
  
• It simply adjusts your Medicare premiums based on income.

Which Parts of Medicare Are Affected by IRMAA?

IRMAA applies to:

• Medicare Part B – covers doctor visits, outpatient care, and preventive services.
  
• Medicare Part D – covers prescription drug plans.

IRMAA does not apply to:

• Medicare Advantage (Part C) plan premiums
  
• Medigap (supplement) plan premiums

Note: Even if you have a Medicare Advantage plan with drug coverage, the Part D IRMAA still applies and is billed separately.

How Does Medicare Determine IRMAA?

Medicare calculates IRMAA based on your Modified Adjusted Gross Income (MAGI) from two years ago, according to your IRS tax return.

For example:

• 2026 Medicare premiums are based on 2024 income.

If your income exceeds Medicare’s thresholds, you’ll pay an IRMAA surcharge.

How Are IRMAA Payments Collected?

• Part B IRMAA is added to your monthly Part B premium.
  
• Part D IRMAA is billed separately by Medicare (not your drug plan), usually through:
  
  • Social Security deduction, or
    
  • Direct billing

What If Your Income Has Decreased?

If your income has dropped due to a life-changing event, you may be able to appeal IRMAA. Life-changing events include:

• Retirement or reduced work hours
  
• Divorce or death of a spouse
  
• Loss of income-producing property
  
• Employer settlement payout ending

Medicare allows you to request a review using Form SSA-44.

Why Understanding IRMAA Is Important

IRMAA can significantly increase your Medicare costs—sometimes by hundreds of dollars per month. Knowing how it works helps you:

• Avoid unexpected charges
  
• Plan for future healthcare expenses
  
• Take action if your income changes

Not everyone pays IRMAA, but if it applies to you, understanding it can make a big difference in budgeting and Medicare decisions.

If you have questions about IRMAA, Medicare enrollment, or how income affects your premiums, it’s always wise to consult a licensed Medicare professional who can review your situation and guide you through your options.

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