What Is a Roth Conversion?

A Roth conversion can be a powerful retirement tax-planning strategy for people who want to move money from a traditional tax-deferred retirement account into a Roth IRA. The trade-off is straightforward: you generally pay income tax on the amount converted today in exchange for the potential for tax-free qualified withdrawals later.

But a Roth conversion is not automatically beneficial for everyone. The amount you convert, your current tax bracket, your expected future income, retirement timing, Medicare premiums, and your estate-planning goals can all affect whether a conversion makes sense.

In this guide, we'll explain what a Roth conversion is, how it works, the potential benefits and drawbacks, when conversions may be useful, and how to incorporate them into a broader retirement plan.

What Is a Roth Conversion?

A Roth conversion is the process of transferring money from an eligible tax-deferred retirement account, such as a traditional IRA, into a Roth IRA.

Traditional retirement accounts generally provide tax deferral: contributions may receive tax benefits depending on the account and circumstances, while withdrawals are generally taxable as ordinary income.

Roth IRAs work differently. Qualified Roth IRA distributions are generally tax-free, and the original owner of a Roth IRA does not have to take required minimum distributions (RMDs) while alive. :contentReference[oaicite:1]{index=1}

A Roth conversion effectively moves money from the tax-deferred side of your retirement plan to the Roth side. The conversion itself is generally taxable, but future qualified Roth withdrawals can be tax-free.

If you want to understand the Roth account itself before considering a conversion, read our guide to What Is a Roth IRA?

How Does a Roth Conversion Work?

The process is relatively simple, although deciding how much to convert can require careful tax planning.

1. Identify the account to convert. This may be a traditional IRA or, depending on the retirement plan and circumstances, money from an employer-sponsored retirement plan.
2. Determine how much to convert. The conversion amount generally becomes part of your taxable income for the year of the conversion.
3. Complete the conversion. The financial institution transfers the eligible funds into a Roth IRA.
4. Plan for the tax bill. You may need to make additional tax payments or adjust withholding to account for the additional taxable income.

For example, suppose you have $100,000 in a traditional IRA and decide to convert $30,000 to a Roth IRA. Assuming the entire conversion is taxable, that $30,000 is generally added to your taxable income for the year.

The actual tax cost depends on your complete tax situation. A conversion does not necessarily mean that the entire amount is taxed at one single rate. Because the U.S. federal tax system uses marginal tax brackets, the additional income can span multiple brackets.

Why Consider a Roth Conversion?

The primary reason to consider a Roth conversion is to exchange a tax liability today for the possibility of tax-free qualified retirement income later.

1. Potential for Tax-Free Retirement Income

Once money is in a Roth IRA, qualified distributions can generally be withdrawn tax-free. This can provide valuable flexibility when managing retirement income from multiple account types.

Having both taxable and tax-free sources of retirement income can make it easier to control how much taxable income you recognize in a particular year.

2. No Lifetime RMDs for the Original Roth IRA Owner

Roth IRA owners generally are not required to take RMDs during their lifetime. Traditional IRAs, by contrast, generally require RMDs beginning at age 73 under current federal rules. :contentReference[oaicite:2]{index=2}

This can give a Roth IRA owner greater control over when retirement assets are withdrawn.

For more information about retirement withdrawals, see our Retirement Withdrawal Calculator .

3. Greater Tax Diversification

Retirement savings do not have to be entirely traditional or entirely Roth. Holding different types of accounts can provide flexibility when tax rates, income needs, or market conditions change.

For example, a retiree might use taxable income from a traditional IRA during one year and supplement it with tax-free qualified Roth withdrawals when appropriate.

4. Potential Estate-Planning Benefits

Roth assets can also be useful in estate planning because qualified withdrawals are generally tax-free to the account owner.

However, Roth IRAs are not completely exempt from beneficiary distribution rules. Beneficiaries can still be subject to inherited-account distribution requirements, including the applicable 10-year rule in many situations. :contentReference[oaicite:3]{index=3}

Taxes and Roth Conversions

Taxes are the most important consideration when evaluating a Roth conversion. The converted amount is generally included in taxable income for the year in which the conversion takes place.

That means a large conversion can push some of your income into a higher marginal tax bracket.

For 2026, the federal income tax brackets for married couples filing jointly range from 10% to 37%. The 24% bracket, for example, begins at $211,400 of taxable income and extends to $403,550. These thresholds apply to taxable income, not simply gross income. :contentReference[oaicite:4]{index=4}

This is one reason many retirement planners consider partial Roth conversions rather than converting an entire traditional retirement account at once.

What Is a Partial Roth Conversion?

A partial Roth conversion means converting only a portion of a traditional retirement account each year.

Suppose you have $500,000 in a traditional IRA. Instead of converting the entire $500,000 in one year, you might convert a smaller amount annually while watching your taxable income and tax brackets.

The goal is not necessarily to minimize taxes in every individual year. Instead, the objective may be to manage your lifetime tax burden while creating more flexibility in retirement.

When Might a Roth Conversion Make Sense?

Roth conversions can be particularly relevant during periods when your taxable income is temporarily lower than it is expected to be in future years.

Early Retirement Years

One common situation occurs after someone retires but before other sources of retirement income have fully started.

For example, an early retiree may have several years between leaving work and starting Social Security. Those lower-income years can create an opportunity to evaluate whether partial Roth conversions fit within the available tax brackets.

Before Required Minimum Distributions Begin

Traditional IRA owners generally must begin RMDs at age 73 under current federal rules. A Roth conversion before that point can reduce the amount remaining in a traditional IRA, potentially reducing future RMDs. :contentReference[oaicite:5]{index=5}

A Roth conversion does not eliminate all future taxes, however. The conversion itself can create a significant tax bill, so the timing and amount matter.

Years With Unusually Low Income

A temporary reduction in income can create a different tax-planning environment. This might happen after retirement, during a career transition, or during another year when taxable income is substantially below normal.

Important Roth Conversion Considerations

The Tax Bill

The most obvious drawback is the immediate tax liability. Converting too much in one year can create a much larger tax bill than expected.

It is important to distinguish between the amount converted and the amount of tax ultimately owed. Your marginal tax brackets, deductions, credits, other income, and state taxes can all affect the result.

Medicare Premiums

For Medicare beneficiaries, a large increase in income can also affect income-related Medicare premium adjustments. Consequently, a Roth conversion should be evaluated alongside the broader retirement-income picture rather than looking only at the immediate federal income tax.

Investment Growth

A Roth conversion does not guarantee better investment returns. The investment itself still carries market risk. The potential benefit comes primarily from the different tax treatment of the account.

Paying the Conversion Tax

If possible, some people use money outside the retirement account to pay the resulting tax rather than withholding the tax from the converted amount.

The appropriate approach depends on the individual's circumstances, age, liquidity, tax position, and retirement goals.

The Roth IRA Five-Year Rules

The five-year rules surrounding Roth accounts can be confusing because there is more than one five-year concept.

For qualified Roth IRA distributions, the Roth IRA generally must satisfy the applicable five-tax-year requirement, along with the other requirements for a qualified distribution.

Roth conversions also have a separate five-year rule that can matter when determining whether converted amounts can be withdrawn without the 10% early distribution penalty.

Because these rules can interact differently depending on your age, contribution history, conversion history, and withdrawal circumstances, it is important not to assume that every Roth withdrawal follows exactly the same five-year clock.

Can You Undo a Roth Conversion?

Generally, no. The tax law changed the treatment of Roth conversions so that taxpayers generally cannot use a Roth recharacterization to undo a completed conversion.

This makes it especially important to estimate the tax consequences before completing a large conversion.

Examples of Roth Conversion Strategies

Example 1: Early Retiree

Imagine someone retires at age 62 and has relatively little taxable income for several years before starting Social Security.

Rather than waiting until later retirement years, they could evaluate partial Roth conversions during those lower-income years.

The objective would be to determine whether paying tax on some retirement assets earlier creates a useful long-term tax trade-off.

Example 2: Large Traditional IRA

Consider a retiree with a substantial traditional IRA who expects to have significant taxable income later in retirement.

Leaving the entire balance in the traditional IRA could result in substantial future taxable withdrawals and RMDs. A series of partial conversions could potentially change the balance between taxable and tax-free retirement assets.

Example 3: Converting Too Much

Now consider someone who converts a very large amount in a single year. The additional taxable income could push part of the conversion into higher marginal tax brackets and may affect other income-based costs.

This illustrates why "convert as much as possible" is not necessarily a complete Roth conversion strategy. The amount converted should be evaluated within the context of the entire financial plan.

Who Should Consider a Roth Conversion?

A Roth conversion may be worth evaluating for people who:

• Expect to have significant taxable retirement income in future years.
• Have retirement years with temporarily lower taxable income.
• Want greater flexibility between taxable and tax-free retirement income.
• Have substantial traditional retirement balances and are concerned about future RMDs.
• Want to consider tax-efficient wealth transfer as part of their estate plan.

These factors do not automatically mean a conversion is appropriate. A Roth conversion should be evaluated against the person's complete financial and tax situation.

How to Plan a Roth Conversion

1. Look at Your Current Tax Bracket

Start by determining your current taxable income and how much additional income you could recognize before reaching the next marginal tax bracket.

2. Estimate Future Retirement Income

Consider Social Security, pensions, traditional IRA withdrawals, investment income, and other sources of taxable retirement income.

3. Consider Future RMDs

A large traditional IRA can create substantial RMDs later in retirement. Understanding the potential future withdrawals can help put today's conversion decision into perspective.

4. Model Different Conversion Amounts

Instead of evaluating only one conversion amount, compare several scenarios. Converting $20,000, $40,000, or $60,000 may produce very different tax outcomes.

Retirementize can help you model retirement income, withdrawals, taxes, and long-term financial outcomes so that a Roth conversion can be considered as part of your overall retirement plan.

You can also explore our article on Retirement Planning Mistakes for other issues that can affect retirement income planning.

Roth Conversions and Canadians

Roth conversions are a U.S. retirement-planning strategy. Canadian residents should not assume that the U.S. tax treatment automatically applies in Canada.

Cross-border retirement accounts can involve additional tax rules and treaty considerations. Canadians with U.S. retirement accounts should consider the Canadian and U.S. tax implications together before making a conversion.

For Canadian retirement planning, you may also want to review our RRSP Withdrawal Tax Calculator .

Common Questions About Roth Conversions

Is a Roth conversion taxable?

Generally, yes. The taxable portion of the amount converted from a traditional retirement account is generally included in income for the year of the conversion.

Can I convert my entire IRA to a Roth IRA?

A full conversion may be possible, but that does not necessarily make it the most appropriate strategy. A large conversion can create a substantial tax bill and may affect other income-based costs.

Do Roth IRAs have RMDs?

The original owner of a Roth IRA generally does not have lifetime RMDs. However, beneficiaries of Roth IRAs are subject to inherited-account distribution rules. :contentReference[oaicite:6]{index=6}

Can a Roth conversion lower my future RMDs?

Potentially. Money converted from a traditional IRA to a Roth IRA is no longer part of the traditional IRA balance, so it is no longer included in that traditional IRA's future RMD calculation.

Will a Roth conversion affect Medicare premiums?

It can. A large increase in income can affect income-related Medicare premium calculations, so this should be considered when evaluating the size and timing of a conversion.

Can I undo a Roth conversion?

Generally, no. Roth conversions generally cannot be recharacterized back into a traditional IRA under current federal tax rules.

Conclusion

A Roth conversion can be an important part of a retirement tax strategy, but the decision is about more than simply moving money from one account to another.

The amount converted, your current and future tax brackets, retirement income, RMDs, Medicare premiums, investment horizon, and estate-planning goals can all affect the outcome.

For some retirees, converting part of a traditional retirement account during lower-income years can create valuable tax diversification and future income flexibility. For others, the immediate tax cost may outweigh the potential benefits.

The key is to model the conversion as part of your complete retirement plan rather than evaluating it in isolation. Retirementize can help you examine retirement income, taxes, withdrawals, and long-term financial outcomes so you can better understand how different strategies may affect your retirement.

Start planning your retirement with Retirementize.