When Does a Roth Conversion Actually Make Sense?
By Jesse Stacy MTAX, CFP®, EA | JCS Retirement Tax Advisors, Columbus, OH | Last reviewed June 2026
A Roth conversion makes sense when the tax rate you pay today is lower than the rate you would pay later. That is the whole decision in one sentence. The hard part is spotting the years when your rate is genuinely low, because those windows do not last and they are easy to miss while life is busy. For a lot of people near retirement here in Columbus, the best window is the quiet stretch after work ends and before required withdrawals begin.
What a Roth Conversion Actually Is
A Roth conversion is when you move money from a traditional IRA into a Roth IRA and pay the tax on it now instead of later. Money in a traditional IRA has never been taxed. You took the deduction going in, it grew tax deferred, and the IRS gets its share when you pull it out. A Roth works the opposite way. You pay the tax today, and from then on the money grows and comes out tax free. A conversion is just the bridge between the two, paid on your terms.
Why the Timing Is the Whole Game
Here is the part people miss. A conversion is not really a tax question. It is a timing question. You are choosing to pay the tax in a year you pick rather than letting the IRS pick the year for you, which it eventually will through required minimum distributions starting at age 73.
So the question is never whether you should do a Roth conversion. The question is whether your tax rate is likely lower now than it will be later. If the answer is yes, paying now is the smart move. If the answer is no, you are just prepaying a bill you could have settled cheaper down the road.
How the Tax Part Works
The amount you convert gets added to your income for the year and taxed as ordinary income, stacked on top of whatever else you earned. Our system runs in brackets, so each layer is taxed at a higher rate as you climb. Here are the 2026 federal brackets for a married couple filing jointly, applied to taxable income after the $32,200 standard deduction.
2026 taxable income (married, filing jointly)
Tax rate on that layer
$0 to $24,800
10%
Over $24,800 to $100,800
12%
Over $100,800 to $211,400
22%
Over $211,400 to $403,550
24%
Over $403,550 to $512,450
32%
Over $512,450 to $768,700
35%
Over $768,700
37%
The idea is to fill up a low bracket without spilling into the next one. Say your taxable income sits at $60,000. You have room to convert about $40,000 more before you leave the 12 percent bracket. Convert past that and the overflow gets taxed at 22 percent. None of that is bad. It is just math you want to do on purpose instead of by accident.
A Simple Example
Say you and your spouse are 62, recently retired, with about $1.3 million in traditional IRAs. Social Security has not started yet. Required withdrawals are still eleven years off. Your income this year is genuinely low, maybe a little interest and some part time consulting.
That stretch between retiring and turning 73 is often the best conversion window you will ever get. Your rate is low and you control it. You convert a slice each year, filling up the 12 percent bracket and part of the 22 percent bracket, and you pay tax at rates you may not see again once other income kicks in. Every dollar you move now is a dollar that will not be forced out later at a higher rate.
Wait until 73 and the math turns against you. The IRS starts forcing withdrawals on that whole $1.3 million, your Social Security is running, and a good chunk of your income is no longer yours to time. The window did not close because you did something wrong. It closed because you waited.
When It Usually Does Not Make Sense
Conversions are not free money, and they do not fit everyone. If your income is high right now and you expect it to drop in retirement, converting today just pays tax at your top rate for no reason. If the account is headed to charity, which owes no tax on it anyway, a conversion wastes money. And if writing the check for the tax means pulling from the IRA itself, the strategy loses much of its punch. The cleanest conversions get paid for with cash from outside the retirement account.
The Whole Idea
A Roth conversion lets you choose when to pay the tax instead of letting the IRS choose for you. It tends to make sense in those quiet, lower income years after work ends and before required withdrawals begin. The catch is that those windows are easy to miss, and the right amount depends on your brackets, your Medicare thresholds, and what your income is likely to look like a decade out. That is the kind of thing worth having someone watch for you.
Frequently Asked Questions
At what age does a Roth conversion make the most sense?
Often in the years between retiring and age 73, when work income has stopped but required withdrawals have not started yet. Your taxable income is usually at its lowest then, so a conversion is taxed at a lower rate.
Is there an income limit to do a Roth conversion?
No. Anyone with a traditional IRA can convert, no matter how high their income is. That is different from contributing directly to a Roth IRA, which does have income limits.
Do I have to convert the whole account at once?
No, and usually you should not. Most people convert a slice each year to stay inside a target bracket. Spreading it out keeps more of the conversion taxed at the lower rates.
Will a conversion affect my Medicare premiums?
It can. A large conversion can raise your income enough to trigger the IRMAA surcharge on your Medicare premiums two years later. That is one more reason to size a conversion with the thresholds in view rather than converting a big lump all at once.
Jesse Stacy is a CERTIFIED FINANCIAL PLANNER™ and an Enrolled Agent in Columbus, Ohio, where JCS Retirement Tax Advisors helps people near retirement plan their taxes and investments as one picture. This article is educational and is not tax, legal, or investment advice.
Sources: IRS tax year 2026 inflation adjustments (brackets and standard deduction); IRS required minimum distribution FAQs (age 73); IRS Roth IRAs overview; Medicare costs (Medicare.gov).