He Retired in March at 65 With $30,000 of Salary Already Earned and Converted $60,000 That Same Year. Waiting Until January Would Have Kept the Whole Conversion at 12%
Retiring mid-year feels like the perfect moment to start a Roth conversion, but the paycheck you stopped collecting months ago can still push thousands of dollars into a higher bracket and trigger a Medicare surcharge you won't see until two…
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Someone who retires in March at 65 has already earned wages that fill the lower tax brackets before any conversion. A Roth conversion is ordinary income, and ordinary income stacks. Brackets fill from the bottom up: wages first, then anything layered on top. Whatever rate applies to the conversion is the rate on the dollars that land above the salary already there.
Why the Same $60,000 Costs More
Consider a single filer in tax year 2026. The standard deduction is $16,100. Above that, the 12% rate applies to taxable income over $12,400, and the 22% rate takes over above $50,400. Now, stack the retirement year and the numbers speak for themselves. Thirty thousand dollars of wages plus a $60,000 conversion is $90,000 of gross income. After the standard deduction, the taxable amount pushes well into the 22% bracket, and the slice of the conversion sitting above the $50,400 line is taxed at 22% rather than 12%.
Run the identical conversion in January of the following year with no wages, and $60,000 minus the standard deduction lands entirely below the $50,400 threshold. Every dollar of the conversion clears at 12% or below. It is the same person, the same account, and the same amount moved, on a different calendar with a different bill.
Why People Get This Backward
The timing impulse is understandable. The retirement year feels like the moment to get organized. Someone rolls over an old 401(k), meets with an advisor for the first time in years, reads about tax-free growth, and pulls the trigger. Everything about that sequence is reasonable except the timing. The worst year to convert is the year you still have a paycheck, and it is the year most people choose.
What Actually Argues Against Waiting
Waiting can still be wrong in specific situations. Several things make the empty year less empty than you might expect. Severance paid after the retirement date, an accrued vacation payout, a final bonus, or deferred compensation that vests on schedule can all land in year two and quietly reload the low brackets. Exercising nonqualified stock options in the retirement year creates ordinary income on top of the salary, which makes the stacking problem worse, though it can also mean the following year gets its own equity event.
A working spouse matters even more, because household brackets on a joint return remain partly filled as long as one paycheck is still coming in. Social Security claimed in the same window adds taxable income and drags a larger share of the benefit itself into taxation. And the number of clear conversion years actually available before required minimum distributions begin sets the value of waiting. At 65, that window runs until age 73. Losing one year out of eight costs little, while losing one year out of two costs much more.
Medicare Surcharge That Surfaces Two Years Later
At 65 a new retiree is entering Medicare, and this is where the retirement-year conversion does its quietest damage. The 2026 Part B income-related monthly adjustment uses modified adjusted gross income from two years prior. A single filer stays at the base $202.90 premium only while MAGI is at or below $109,000. Cross that line, and the surcharge starts at $81.20 per month and climbs from there. Part D carries its own surcharge on the same schedule.
A conversion stacked on salary can push MAGI across a threshold in the retirement year and produce a premium bump two years later, long after the income that caused it is gone. The Social Security Administration treats work stoppage as a life-changing event and will recalculate the surcharge based on current income when the retiree files Form SSA-44 with documentation. Almost no one knows to file it.
Rule to Leave With
In the retirement year, add up the wages already earned, subtract the standard deduction, and see how much room remains beneath the next bracket line. Room beneath the next bracket line indicates how much of a conversion would clear at the lower rate. The first full January without a paycheck marks the practical start of the conversion window, and that window narrows as required distributions approach at 73 (we sized up those low-tax years between the last paycheck and the first RMD in a free Roth window guide). The room calculation on wages already earned, rather than the account balance, effectively sets the conversion size. That number, rather than the account balance, sets the conversion size.
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David Beren has been a Flywheel Publishing contributor since 2022. Writing for 24/7 Wall St. since 2023, David loves to write about topics of all shapes and sizes. As a technology expert, David focuses heavily on consumer electronics brands, automobiles, and general technology. He has previously written for LifeWire, formerly About.com. As a part-time freelance writer, David’s “day job” has been working on and leading social media for multiple Fortune 100 brands. David loves the flexibility of this field and its ability to reach customers exactly where they like to spend their time. Additionally, David previously published his own blog, TmoNews.com, which reached 3 million readers in its first year. In addition to freelance and social media work, David loves to spend time with his family and children and relive the glory days of video game consoles by playing any retro game console he can get his hands on.
