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Roth Conversions: a smart tax move, or an expensive mistake?

A clear, no-pressure guide to deciding whether converting pre-tax retirement savings to a Roth may fit your situation. Written by our advisors for families planning retirement income and taxes together.

Cover of the Roth Conversions guide from Capital Investment Advisors
  • 18-page illustrated guide, no jargon
  • Includes the Roth Conversion Decision Tree
  • Written by CIA advisors
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The real question: pay taxes now, or later?

A Roth conversion moves money from a pre-tax account, such as a traditional IRA or an old 401(k), into a Roth IRA. You pay income tax on the amount now, in exchange for the potential for tax-free growth and tax-free qualified withdrawals later in retirement, subject to IRS rules.

Whether that trade works for you depends on your tax bracket today versus the brackets you expect in the future, how you would pay the tax bill, and where the conversion fits inside your broader retirement income plan. For some households, it may reduce future tax friction and create more flexibility. For others, it may trigger a significant tax bill at the wrong time. This guide walks through both sides so you can have a more informed conversation before you decide.

Quick checkpoint

Could a conversion be worth a closer look?

Answer three questions to see where a common planning framework would place you. This is the same logic explained in full inside the guide.

1 Is your current marginal tax bracket below 24%?
2 Are you currently taking Required Minimum Distributions (RMDs)?
3 Is more than about 75% of your nest egg in pre-tax accounts, like a traditional IRA or 401(k)?

This is a general educational framework, not personalized tax or financial advice. Your actual answer depends on your income, tax brackets, account mix, and long-term retirement goals. Adapted from the Roth Conversion Decision Tree created by James Lewis, CFP®, Capital Investment Advisors.

What is inside

A complete, plain-English walkthrough

What a Roth conversion is, and why it comes up in so many planning conversations
When a conversion may make sense, and when it may backfire
The tax bracket window, and how to pay the tax bill efficiently
Converting in stages, RMDs, and the early retirement gap years
The Roth Conversion Decision Tree, a simple visual checkpoint
Real-world example scenarios and the most common mistakes to avoid

Common questions

Roth conversions, answered

A Roth conversion is the process of transferring money from a pre-tax retirement account, such as a traditional IRA or an old 401(k), into a Roth IRA. You pay income tax on the amount you convert in the year you convert it. In exchange, that money then has the potential for tax-free growth and tax-free qualified withdrawals later in retirement, subject to IRS rules.

It depends on your situation. A conversion may be compelling if you expect higher future tax exposure, have cash set aside to pay the tax bill, and are sitting in a temporary lower-income window. It may be far less appealing if you are already in a high bracket or would need retirement assets themselves to cover the tax cost. The same conversion amount can be right for one household and less appropriate for another.

Conversions often become more appropriate during lower-income years, for example after retiring but before Social Security and required minimum distributions begin. In those windows, the goal is usually not to convert everything, but to fill up your current tax bracket without spilling over into a much higher one.

A conversion can become expensive when it is driven by enthusiasm rather than planning. Converting a large balance in a single high-income year can push you into a higher tax bracket, increase Medicare-related costs later, and create avoidable tax friction. Timing matters, which is why many families choose to convert gradually instead of all at once.

A conversion is often more attractive when the tax bill is paid from cash or taxable savings outside the pre-tax account. Doing so preserves more of the converted assets inside the Roth, where future growth may benefit from tax-free treatment if withdrawal rules are met. Using the retirement dollars themselves to pay the tax often weakens the long-term math.

Yes. For many families, a series of partial conversions over several years may make more sense than one dramatic move. Gradual conversions may allow you to use several lower-tax years, monitor your bracket exposure, and adjust as laws, markets, and personal circumstances change.

Talk it through

Want to run your own numbers?

If you would like to see how a conversion could look in your situation, our advisors can walk through your tax brackets, future RMDs, Social Security timing, and how the tax bill would be paid, before you make any decisions.

Roth Conversions: a smart tax move, or an expensive mistake?

A clear, no-pressure guide to deciding whether converting pre-tax retirement savings to a Roth may fit your situation.