A Roth conversion can be a smart move. It can also be expensive.
Too many conversations start with the wrong question. People ask, “Should I consider a Roth conversion?” That sounds reasonable, but it is too broad. A better question is this: “What future tax problem am I trying to solve, and is paying tax now likely to leave me in a better position later?”
Many people do not realize how much future tax pressure can build inside large pre-tax accounts. The real danger is not only paying more taxes later. It is losing flexibility at the exact time you may need it most.
A Roth conversion moves funds from a traditional IRA to a Roth IRA, and the amount converted is generally taxable in the year of the conversion. In other words, this is not a free benefit. It involves a tradeoff. You pay tax now in the hope that doing so provides greater flexibility later. You also hope that paying taxes today will reduce what you or your heirs pay later.
Key Takeaways
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What a Roth Conversion Really Is
A Roth conversion is not a reward for good planning. It means choosing to pay taxes now instead of later.
That choice can make sense when paying taxes now is likely to cost less than paying them later. It can be less helpful when it simply creates a tax bill without meaningfully improving the rest of the plan.
That is why I do not think the right starting point is whether a Roth conversion is a good idea. The better question is whether this particular conversion is likely to improve your future options.
If too much wealth stays trapped in pre-tax accounts, retirement can become less flexible than it first appears.
When a Roth Conversion Helps
When today’s tax cost may be lower than tomorrow’s
When a Roth conversion helps, it is often because it occurs in a year when your taxable income is temporarily lower.
That may happen after retirement and before Social Security begins. It may happen before required minimum distributions start. It may happen in any year when your income is lower than usual, and you have room to fill a lower tax bracket intentionally rather than leaving more of the IRA to be taxed later under less favorable circumstances. Currently, traditional IRA owners generally must begin taking required minimum distributions (RMDs) at age 73. Those born in 1960 or later can wait until age 75 to start taking RMDs. Roth IRAs do not require that the original owner take RMDs during their lifetime.
Roth conversion before RMDs
A Roth conversion before RMDs begin can be especially worth considering when large traditional IRA balances are likely to create future pressure.
Large pre-tax balances can lead to forced taxable income later, whether you need that income or not. That can reduce flexibility and make other planning decisions harder. Sometimes the issue is not today’s tax bill. It is tomorrow’s required income.
Roth conversion in retirement
A Roth conversion in retirement can also help improve tax diversification.
I think this point gets overlooked. Having money in taxable, tax-deferred, and tax-free buckets can create better choices later. It can give you more flexibility when managing brackets, withdrawals, charitable gifts, and other decisions that become more complicated when too much of the portfolio sits in one tax bucket.
A Roth conversion can help not because Roth is automatically better, but because having money in different tax buckets can create more flexibility later.
When survivor planning matters
One of the strongest reasons many married couples consider a Roth conversion is to reduce the tax pressure a surviving spouse may face later.
A couple may pay taxes one way today, then leave a surviving spouse with a similar pool of assets but narrower tax brackets and potentially higher Medicare costs later. A Roth conversion can sometimes reduce part of that future compression. That does not make conversions automatic. It does make them worth examining more carefully. That future pressure can reduce flexibility at exactly the moment the survivor may need more flexibility, not less.
When heirs and legacy flexibility matter
A Roth conversion can also help when passing assets to heirs is part of the planning picture. If your heirs are likely to inherit traditional IRA assets, they may have to recognize taxable income when they take distributions. A Roth conversion does not eliminate every planning issue, but it can shift some of that future tax burden into a year when paying the tax now may be more manageable or more strategic. I would not make heirs the sole reason to convert, but it can be one factor worth weighing.
When state taxes may get worse later
State taxes can matter too.
If you expect to move from a lower-tax state to a higher-tax one, waiting may become more expensive. That does not mean state tax rules should drive the entire decision. It does mean they deserve a seat at the table.
Consider this fact pattern. You currently live in a state where you will not pay taxes on amounts you convert. In retirement, you plan to relocate to a state where you will pay taxes on distributions from your retirement accounts. In a situation like this, Roth conversions before you move may be worth considering because they could lower your overall tax bill.
Using Outside Cash to Pay the Tax
Paying the tax from outside cash is often better.
It preserves more money in the Roth and avoids some of the damage that can result from withdrawing additional funds from the IRA to pay the tax bill. It also optimizes the value of the converted amount, as tax payments due do not reduce the conversion amount. But I would not turn that into an absolute rule. Using outside cash is often ideal. But it is not required for a Roth conversion to make sense.
When a Roth Conversion May Not Help
When the conversion creates more cost than future value
In some cases, not converting is the better decision. When a Roth conversion may not help, it is often because it pushes income into a higher tax bracket without solving a meaningful future problem.
That can happen when someone converts simply because Roth sounds appealing. It can also happen when the conversion creates side effects that get overlooked.
Roth conversion and IRMAA
A Roth conversion can become much more expensive when it raises Medicare premiums.
A conversion increases current-year income. That may cause more Social Security benefits to become taxable, push someone into a higher tax bracket, or move Medicare premiums into a higher Income-Related Monthly Adjustment Amount (IRMAA) range. Medicare generally uses Modified Adjusted Gross Income (MAGI) from two years earlier to determine premiums, so the effects of a conversion can linger beyond the conversion year itself.
That is one reason the real cost of a conversion may be higher than the current bracket alone suggests.
When you may need the money soon
A conversion may also be less compelling when you may have a short-term need for the money.
The longer the money stays in the Roth, the easier it is to justify paying tax now in exchange for future tax-free growth and more flexibility later. Shorter time horizons weaken that case.
When a lower-tax state may be in your future
Moving to a lower-tax state later can also make a conversion less attractive.
If future withdrawals may face lower state taxes than a conversion would face today, waiting may be the better answer. Again, that does not settle the issue on its own. It does mean geography can matter more than many people expect.
For example, consider a couple who live in Maryland and plan to move to Florida in the near future. As Maryland residents, they could pay close to 9% in state taxes on Roth conversions. If they wait until they move to Florida, they would not owe any state taxes on such amounts. Postponing any Roth conversions until after they move will lower their tax cost.
When paying the tax creates more damage
There is also the practical question of how the tax gets paid.
If someone under age 59½ takes extra IRA money out to cover taxes, that extra distribution may trigger the 10% additional tax unless an exception applies. That can make an already expensive decision even more expensive.
I think the right question to ask is rarely, “Can I do a Roth conversion?” Most people can. The better question is whether the conversion creates more value than cost.
One Rule People Often Miss
Here is one rule people often miss.
If you are already in a year when you must take a required minimum distribution, you must take the RMD first. You cannot convert the RMD itself to a Roth IRA. You can only convert amounts above the RMD amount.
That is not a small detail. It can materially affect how much room you really have to convert.
The Better Questions to Ask
Before asking, “Should I complete a Roth conversion?” I would ask a different set of questions.
- What future tax problem am I trying to reduce?
- Am I converting because I have room, or because I have a real reason?
- Will this improve flexibility later, or am I simply accelerating taxes now?
- What else could this affect besides this year’s tax bracket?
- Would I still want to do this if I looked at the whole plan, not just the IRA?
Those questions usually lead to better decisions than a generic preference for Roth money.
What This Means in Real Planning
A Roth conversion in retirement is not something to do because it sounds smart. It is something to consider when paying tax now may leave you in a better position later.
That better position might mean smaller future RMD pressure. It might mean more tax diversification. It might mean more flexibility for a surviving spouse. It might mean lower exposure to future tax problems that are easy to underestimate today.
Consider this question: Should a couple in their 70s complete annual Roth conversions? For some couples, annual Roth conversions may make sense. To decide, you should understand what future RMDs may look like when just one member of the couple remains. You may want to complete Roth conversions if the analysis suggests that the combination of Social Security income and RMDs would leave the survivor in at least the first IRMAA bracket. The survivor could also be in a higher tax bracket than applies to the couple.
If you think this could be the case, completing Roth conversions up to the level of the first IRMAA bracket now could reduce the likelihood that the survivor will be in the second IRMAA bracket (or higher).
Alternatively, a couple in the 12% tax bracket can benefit from Roth conversions. You might wonder how. After the first member of the couple passes, the survivor will retain most of their income if only the lower of the two Social Security benefits remains. The survivor could easily find herself in the 22% tax bracket. In a case like this, filling the 12% bracket with Roth conversions while they are both alive may be worth considering.
As these examples show, this issue can show up in different ways, even when the numbers are smaller.
A Roth conversion helps when it solves a future tax problem more effectively than it creates a current one.
That is the real standard.
Who Should Look More Closely
This issue deserves the closest look if you are retired or nearing retirement, particularly if you are married and hold substantial traditional IRA balances that could create more future tax pressure than you realize.
It also deserves a closer look if you are in the years before RMDs begin, if you are in a temporarily lower-income year, if you are close to Medicare income thresholds, or if a future state-tax move could change the picture.
Those are the situations where a Roth conversion is most likely to be either genuinely helpful or more expensive than it first appears. Waiting too long to address these issues can narrow future choices.
The Bottom Line
A Roth conversion can absolutely help. It can also disappoint.
The difference usually comes down to timing, future tax pressure, and how much flexibility you want to preserve later. The real mistake is not always converting too much or too little. Often, the bigger mistake is never looking closely enough at whether a future tax problem is building, what it may cost, and how much flexibility it may take away later. Waiting too long to evaluate where you stand can leave a larger future tax problem in place and narrow your choices later.
Next week, I will look at a related question. If charitable giving is part of your plan, what is the right account to give from?
A Good Time to Take a Closer Look
If you are not sure whether a Roth conversion would actually improve your situation, that may be a good reason to look more closely now, before a future tax problem becomes harder to unwind. A conversion can help. But so can simply recognizing early that future tax pressure may be building.
If you would like help thinking through whether a Roth conversion in retirement fits your broader tax strategy, survivor planning, or future flexibility, you can schedule a conversation here.
Related Reading
- 2026 Tax Changes: What Actually Matters
- What the New 2025 Tax Law Means for You
- Navigating Taxes After a Big Life Change: A Guide for Women Starting Fresh
- How Roth Conversions Can Help You, Your Surviving Spouse, and Your Heirs
FAQs
1. When does a Roth conversion usually help most?
When a Roth conversion helps, it is often because the conversion happens in a lower-income year, before RMDs begin, or in a situation where you expect future tax costs will exceed the current tax cost.
2. Can a Roth conversion raise Medicare premiums?
Yes. A Roth conversion and IRMAA can become an issue because the added income may push Medicare premiums into a higher range. Medicare generally uses MAGI from two years earlier.
3. Do I have to pay the tax from outside cash for a Roth conversion to make sense?
No. Paying the tax from outside cash is often better because it preserves more money inside the Roth. But it is not an absolute requirement. A conversion can still make sense in the right situation.
4. What if I am under age 59½ and use IRA money to pay the tax?
That can get more expensive. An early distribution from an IRA may trigger the 10% additional tax unless an exception applies.
5. Can I convert my required minimum distribution to a Roth IRA?
No. If you are already in an RMD year, you must take the RMD first. You cannot convert the RMD itself. You can only convert amounts in excess of the RMD.
6. Can I convert an inherited IRA to a Roth IRA?
Usually, no. If you inherit a traditional IRA from someone other than your spouse, you generally cannot treat it as your own. You also cannot roll amounts into or out of that inherited IRA, so you cannot directly convert that inherited IRA to a Roth IRA. A surviving spouse may have more flexibility because a spouse who is the sole designated beneficiary can elect to treat the IRA as their own, which can change planning options.
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