A December Required Minimum Distribution is the classic Medicare surprise. The check clears before New Year’s, and by the following January, the retiree opens a Social Security benefits statement showing a Medicare Part B premium two IRMAA brackets higher than the year before. The distribution counted as income, and the income showed up in modified adjusted gross income two years later. The premium was adjusted accordingly. This is the mechanic behind the story in the headline, and it is one of the most predictable and least understood pain points in early retirement.
What the 2026 Brackets Actually Look Like
The standard Medicare Part B premium for 2026 is $202.90 per month, up $17.90 from $185.00 in 2025. That is the number that roughly 92% of beneficiaries pay. The other 8% pay an Income-Related Monthly Adjustment Amount on top of that, and the brackets are steep. For an individual filer in 2026, the tiers run $202.90 at or below $109,000 in modified adjusted gross income, $284.10 between $109,000 and $137,000, $405.80 between $137,000 and $171,000, and $527.50 between $171,000 and $205,000.
Two brackets up from the base tier, the jump is from $202.90 to $405.80. On an annual basis, that is roughly $2,435 more in Part B premiums for a single retiree, before Part D IRMAA is added. The Part D adjustment at that same third tier is another $37.50 per month. The full-year hit comes to close to $2,900 for one person and doubles for a married couple, in which both spouses cross the same threshold.
Why the December Timing Matters
The first RMD is the one that catches people off guard. A retiree who turned 73 during the year has until April 1 of the following year to take that initial distribution, and many wait. If the first RMD is taken in December, and a second RMD for the new tax year is taken later that same year, two distributions land in a single calendar year. Both count toward MAGI. Both feed into the IRMAA lookup two years down the line.
The lookback is what makes this feel unfair, as IRMAA for 2026 premiums is based on 2024 tax returns. A retiree who managed income carefully in 2023 and 2024 but took a first RMD in December 2024 to satisfy the age-73 rule may not see the premium consequence until January 2026, more than a year later.
By then, the money is spent, reinvested, or absorbed into the household budget, and the extra $200 a month coming out of the Social Security check feels like a new bill rather than the delayed price of an old decision.
The Broader Income Picture
Retirement income is higher than most pre-retirees expect. Social Security transfer receipts across the economy rose from $1,427.6 billion in the first quarter of 2024 to $1,630.3 billion in the first quarter of 2026, driven partly by the 2.8% Social Security COLA for 2026. On top of that, income receipts on assets totaled $4,281.5 billion in the first quarter of 2026, a category that includes dividends, interest, and capital gains, which also count toward MAGI.
Ordinary spending has kept pace. Average annual household expenditures reached $78,535 in 2024, up from $72,973 in 2022. The personal savings rate fell from 6.2% in the first quarter of 2024 to 3.9% in the first quarter of 2026. The cushion for absorbing an unexpected premium increase is thinner than it was two years ago.
What to Do Before the Next RMD Cycle
Three actions address the IRMAA cliff directly. First, take the first RMD in the year you turn 73 rather than deferring to April 1, so that two distributions do not fall in the same calendar year. Second, use Qualified Charitable Distributions, which allow up to $108,000 per person in 2025 (indexed for 2026) to move directly from an IRA to a qualified charity without counting toward MAGI, effectively satisfying the RMD while keeping IRMAA brackets intact.
Third, file Form SSA-44 with the Social Security Administration if a life-changing event, such as retirement itself, has reduced income below what the 2024 return shows. Approved appeals restart Part B at the standard premium.
The IRMAA surcharge functions as a cliff. One dollar over a threshold triggers the entire bracket. That is the design choice worth planning around.
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