Your Medicare premium at 65 was decided at 63. Most people find out in the order that hurts. Twice this year, the first thing a new client put on my desk was the letter.
The mechanism is IRMAA, the income-related surcharge on Medicare premiums. Medicare doesn’t price your Part B and Part D coverage on this year’s income. It uses your tax return from two years earlier. The return you file for the year you turn 63 becomes the premium bill you pay the year you turn 65, when most people enroll.
And the surcharge works in tiers with hard edges. One dollar over a line buys the whole next tier, for the full year, and if you’re married, for both of you.
What Happens at 63
Now look at what tends to happen right around 63. The retirement-eve money moves: the severance package, the deferred-comp payout that lands when you separate. The concentrated company stock you’d been putting off diversifying. The year you convert a chunk to Roth because the window opened.
Each is often the right move. Each also lands on the one return Medicare is about to photograph.
Nobody plans a career exit around a premium table. But nobody warns you the camera is running, either.
The Bridge Nobody Patrols
I call this the bridge nobody patrols. Your CPA closes the year that happened; the Medicare consequence lives two years in the future, outside the engagement. Your investment adviser doesn’t read tax returns. Medicare itself sends the verdict, not a warning. So a four- or five-figure surcharge falls through the gap between three professionals, none of whom did anything wrong.
If this sounds like the empty seat again, it is. The two-year lookback is the smallest clean example of a pattern that runs through all of retirement tax planning: the consequences live on a longer clock than any single professional is watching.
The Fix Is Upstream
To be fair to the system, some surcharges can be revisited. Social Security recognizes certain life-changing events, and stopping work is one of them, so a surcharge triggered by your last working year can sometimes be reconsidered. Others stand, because nothing on the return was an error. Either way, the cleaner path is upstream.
The moves themselves are seldom the problem. Severance arrives when it arrives, and diversifying a concentrated stock position can matter far more than any premium. The fix is photographing the return before Medicare does: mapping, a few years ahead, which years absorb income and which years need to stay clean. Sometimes the same moves, in a different order, produce a different premium. That ordering is what forward planning is for.
The Question
If you’re within a few years of 63, the useful time to look is before the return is filed, not after the letter arrives.
Do you know what your age-63 tax return is going to say?
Book a 30-minute conversation · 213-456-8356 · jun.huang@innosightwealth.com
This article is education, not individual advice. The thresholds are dollar-specific and change every year, which is why the mapping happens on your numbers, not in an article.