The Medicare Surcharge That Could Cost a High-Earning Couple More Than $10,000 a Year in Retirement

Most retirees know Medicare comes with premiums, but fewer know that for higher earners, those premiums can be substantially higher than the standard rate, and that the income used to calculate the surcharge may be from two years ago, not today. 

For couples who spent their final working years at high income levels, that timing gap can produce a Medicare bill that bears no relationship to what they are actually earning in retirement. 

This surcharge is called IRMAA, and understanding it is one of the most valuable things a retiree can do before Medicare coverage begins. 

What IRMAA Actually Is

IRMAA stands for Income-Related Monthly Adjustment Amount, and it is a surcharge applied to Medicare Part B and Part D premiums for retirees whose Modified Adjusted Gross Income exceeds certain thresholds. For 2026, IRMAA begins at $109,000 for a single filer and $218,000 for a married couple filing jointly, figures based on 2025 tax returns. 

The standard 2026 Part B premium is $202.90, while high earners can be considerably more across any of the five income tiers. At the highest tier, above $500,000 for single filers or $750,000 for married filing jointly, the Part B premium climbs to $689.90 per month per person, plus a Part D surcharge of $91.00 per month per person. 

Ultimately, for a married couple at the highest IRMAA tier, combined Part B and Part D surcharges can reach approximately $1,562 per month, or nearly $18,740 per year. Even at the first IRMAA tier, a couple between $218,001 and $274,000 pays Part B premiums of $284.10 per person, plus a $14.50 Part D surcharge each, adding over $7,100 annually to the total premium (Base + surcharge). The $10,000 threshold in the headline describes a wide band of high-earning retirees, and not just an edge case. 

The Two-Year Lookback Problem

Here is a detail that often catches many high earners off guard: IRMAA is not based on current income, but on MAGI from two years prior. This means that 2026 Medicare premiums will be determined by 2024 income in 2026, by 2025 income in 2027, and so on. 

A couple who worked through 2024 at high salaries and retired in early 2025 will face elevated Medicare premiums throughout 2026, even if their retirement income dropped substantially. The lookback creates an IRMAA penalty assessed at the exact moment retirement begins. 

For many couples, this is an unwelcome surprise in year one or two of retirement that they did not plan for and cannot immediately escape. 

The Appeal Most Retirees Do Not Know Exists

The good news is that IRMAA can be appealed, as the Social Security Administration allows retirees to experience a qualifying life event to request that more recent income be used rather than the two-year lookback. Qualifying events could include retirement, reduction in work hours, divorce, death of a spouse, or the loss of income-producing property. 

The appeal is filed using Form SSA-44, and a retiree who retired in 2025 and faces inflated 2026 premiums based on 2024 working income can file this form to have the current, lower income considered. 

It won’t come as any surprise to learn that the savings can be substantial, potentially thousands of dollars per year for a couple who successfully appeal. Most retirees never file because they do not know it exists, which is a costly oversight for those who qualify. 

The Filing Status Trap That Makes IRMAA Even Worse

There is one additional scenario worth naming because it catches couples completely off guard. Married couples who file separate tax returns, sometimes done for tax planning reasons, such as managing deductions or student loan calculations, face dramatically harsher IRMAA treatment than joint filers. 

The numbers are striking: a spouse filing separately with MAGI above $109,000 pays a Part B premium of $549.20 per month. A joint filer does not reach the same premium level until the household’s MAGI exceeds $410,000. Filing separately essentially collapses five income tiers into two, and the penalty is severe. Above $391,000 in income, filing separately, the Part B premium jumps to $689.90 per month, the highest tier, regardless of what the other spouse earns. 

Couples who file separately for legitimate tax reasons and have not specifically modeled the IRMAA impact of that decision may be paying significantly more for Medicare than joint filing would require. It is worth running both scenarios with a tax advisor before assuming that separate filing is the right choice in the years surrounding Medicare enrollment. 

How Smart Income Planning Can Reduce IRMAA Exposure

For retirees whose income hovers near an IRMAA threshold, managing MAGI is one of the highest-value tax strategies available. Moving from one tier to the next can trigger a surcharge increase of over $100 per month per person, a jump that thoughtful income planning can sometimes avoid entirely. 

Several tools interact directly with MAGI and IRMAA, such as Roth conversions, which reduce future required minimum distributions, lowering MAGI in later retirement years when RMDs would otherwise push income over a threshold. Qualified charitable distributions allow retirees over 70.5 years of age to satisfy RMDs without the amount counting toward MAGI. Timing capital gains realizations across tax years is another lever, a large gain in a single year can push a couple into a higher tier for two full years due to the lookback. 

None of these strategies requires any exotic financial planning, they just require knowing that IRMAA exists, understanding the lookback, and building a distribution plan that treats Medicare premiums as a variable the retiree can actually influence. 

For many high-earning couples, this knowledge alone is worth thousands of dollars per year.