Is there a limit on how much I can convert to a Roth IRA?

There is no specific dollar limit on Roth conversions. However, every dollar you convert from pre-tax accounts is generally taxable as ordinary income in the year of conversion. Large conversions can increase your tax bill, potentially push you into a higher tax bracket, and affect items such as Medicare IRMAA surcharges and the taxation of Social Security benefits.

When is the best time to do a Roth conversion?

There is no universal best time to convert, but Roth conversions are often considered in years when your income is temporarily lower, such as early retirement, a sabbatical, or a gap between jobs. They may also be more attractive if you expect higher tax rates in the future or want to reduce future required minimum distributions. Because tax situations vary, it is important to evaluate conversions as part of a broader financial and tax plan.

How do the 2025 and 2026 tax rules affect Roth conversions?

Under current law, many provisions of the Tax Cuts and Jobs Act are scheduled to expire after 2025, which could result in higher marginal tax rates for some households beginning in 2026 unless new legislation is passed. In addition, enhanced Affordable Care Act premium tax credits are scheduled to end after 2025 unless extended. These changes can affect the after-tax impact of Roth conversions, so it is important to consider both current and potential future tax laws when planning conversions in 2025 and 2026.

Do Roth conversions affect required minimum distributions (RMDs)?

Roth conversions do not eliminate required minimum distributions from pre-tax accounts in the year they are due. If you are subject to RMDs, you generally must take your RMD first, and that amount cannot be converted. However, converting additional funds above your RMD can reduce the size of your pre-tax balance over time, which may reduce future RMDs. Roth IRAs do not require RMDs during the original owner’s lifetime under current rules.

Can I undo a Roth conversion if I change my mind?

No. Under current law, Roth conversions made in 2018 and later cannot be recharacterized, which means they cannot be undone once completed. You may still be able to recharacterize certain Roth IRA contributions, but not conversions. Because conversions are permanent, it is important to carefully evaluate the tax impact before proceeding.

How do the five-year rules work for Roth IRAs?

There are two main five-year rules for Roth IRAs. The first applies to earnings: for earnings to be tax-free, your Roth IRA must have been open at least five tax years and you must be age 59½ or older or meet another qualifying event. The second applies to converted amounts: each Roth conversion has its own five-year clock, which matters if you are under age 59½ and withdraw converted principal. Withdrawing converted amounts before the end of their five-year period and before age 59½ can trigger a 10% early withdrawal penalty.

Will a Roth conversion affect my Medicare premiums?

A Roth conversion can affect your Medicare premiums if it increases your modified adjusted gross income above certain thresholds. Medicare uses a two-year lookback for income-related monthly adjustment amounts (IRMAA), so a conversion in one year can increase your Part B and Part D premiums two years later. It is important to consider IRMAA brackets when planning the size and timing of conversions, especially for people who are already on Medicare or will enroll soon.

Will a Roth conversion affect my ACA premium tax credits?

Yes, a Roth conversion can affect Affordable Care Act premium tax credits because it increases your taxable income. Higher income can reduce or eliminate ACA subsidies, particularly for households under age 65 who purchase coverage on the exchange. This is especially important as the current enhanced premium tax credits are scheduled to end after 2025 unless extended. Anyone relying on ACA subsidies should evaluate the impact of conversions before proceeding.

Is a Roth conversion always a good idea?

A Roth conversion is not automatically good or bad. It may be beneficial for some households and not for others. The potential advantages include tax-advantaged growth, fewer required minimum distributions, and more flexibility for heirs. The tradeoffs include paying more tax today, possible impacts on Medicare premiums, ACA subsidies, and other tax-related items. The best way to decide is to compare your projected taxes and cash flow with and without conversions as part of a comprehensive financial plan. Consider consulting a qualified financial professional or tax advisor before making a decision.

Money 101

Roth Conversion: Rules, RMD Ages, 5-Year Clock, & Pro-Rata

Alvin Carlos
February 8, 2026

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A Roth conversion lets you move money from a pre-tax IRA or 401(k) into a Roth account, pay the income tax now, and then let future growth potentially compound tax-free. With the current rules on RMD ages, two different five-year clocks, Medicare IRMAA, and the scheduled tax law changes in 2026, timing your conversions has never been more important.

This guide walks through when a Roth conversion may reduce lifetime taxes, and when it can backfire, using clear explanations, checklists, and examples. It is for educational purposes only and is not personalized tax or investment advice.

Table of Contents

What Is A Roth Conversion And How Does It Work?

A Roth conversion moves money from a pre-tax retirement account into a Roth account. Common sources are:

Traditional IRA
Rollover IRA
SEP IRA
SIMPLE IRA (after 2 years in the plan)
Pre-tax 401(k) or 403(b)
In-plan Roth conversions inside a 401(k)/403(b), if your employer plan allows it

When you convert:

The pre-tax portion of the amount converted is taxed as ordinary income in that year.
Once in the Roth account, your investments can potentially grow tax-free.
If you follow the IRS rules, future qualified withdrawals from the Roth may be tax-free.

RMD reminder:
If you are already subject to Required Minimum Distributions (RMDs), you generally must take your RMD first. The RMD amount itself cannot be converted.

Under current law, RMDs from traditional IRAs and pre-tax 401(k)s begin at age 73 for most people now reaching RMD age.
The RMD age is scheduled to increase again to 75 in 2033 for younger cohorts.

Roth IRAs do not require RMDs during the original owner’s lifetime. Roth 401(k) RMDs have also been eliminated starting in 2024, but inherited Roth accounts are still subject to post-death distribution rules.

Key Benefits of a Roth Conversion

Tax-Free Growth: Your investments grow without any future tax obligations.
No Required Minimum Distributions (RMDs): Roth IRAs do not require RMDs during the account holder’s lifetime, offering more flexibility.
Tax-Free Inheritance: Beneficiaries typically inherit Roth IRAs income-tax-free, but most non-spouse beneficiaries still must drain the account within 10 years (with some exceptions). That can make Roth dollars attractive for long-term estate planning.

Example: How Bill and Jen Used Roth Conversions to Grow Wealth

Meet Bill and Jen, a married couple who retired at age 55.

They have:

$1 million in pre-tax 401(k)s
$500,000 in a Roth IRA
$500,000 in a brokerage account

With no earned income now, their federal tax bracket dropped from 24% to 10%. Instead of withdrawing from their 401(k)s—which would trigger ordinary income taxes—they begin drawing from their taxable brokerage account.

This opens up a golden opportunity: each year, they convert just enough from their 401(k)s into a Roth IRA to fill up their 10% tax bracket. Over six years, this strategy allows their converted funds to grow tax-free, resulting in a projected $260,000 increase in net wealth by age 72.

Note: This Roth conversion story about Bill and Jen is a hypothetical client scenario. Financial planning recommendations and actual results may vary significantly, and future outcomes are not guaranteed. The annual rate of return assumptions started at 6.5% and decreased to 4.9% over time. Please consult your financial advisor before attempting a Roth conversion.

Why Do A Roth Conversion?

Here are some common reasons people consider Roth conversions:

Potential for Tax-Free Withdrawals Later
If you expect to be in a higher tax bracket later in retirement (for example because of RMDs, pensions, or a surviving spouse filing single), paying tax today at a lower rate may reduce lifetime taxes.
Reduce Future RMDs
Converting some pre-tax money into Roth today means smaller pre-tax balances later, which may reduce your RMDs and your future taxable income.
Flexibility for Surviving Spouse or Heirs
Roth accounts can give a surviving spouse or children more tax-efficient assets to draw from, especially during the 10-year post-death distribution window.
Future Tax Rate Uncertainty (Including 2026)
Under current law, many of the individual tax cuts from the Tax Cuts and Jobs Act are scheduled to expire after 2025. That could mean higher federal tax rates in 2026 and beyond unless Congress acts. A measured Roth conversion strategy can be one way to “lock in” today’s known tax rates on a portion of your retirement savings.

When Is The Best Time To Convert?

There’s no universal “best” time. However, a conversion often makes more sense when several of these apply:

Your current marginal tax rate is lower than what you reasonably expect in retirement.
You’re in a “gap” period: early retirement, a sabbatical, between jobs, or before Social Security/RMDs begin.
You expect your taxable income to rise in the future (for example, once both Social Security and RMDs are in play).
You have cash outside your IRA to pay the tax bill.
You can convert without triggering a large Medicare IRMAA surcharge two years later or losing valuable tax credits.

Specific 2025–2026 Considerations

TCJA sunset: Absent new legislation, parts of the tax code are scheduled to change after 2025. That may result in higher marginal tax rates for some households starting in 2026.
ACA premium tax credits: Enhanced Affordable Care Act subsidies are currently scheduled to expire after 2025. For pre-Medicare households using the ACA marketplace, even a modest Roth conversion could increase income and sharply raise health insurance costs once those enhanced credits end, if they are not extended.
Medicare IRMAA: Medicare’s income-related monthly adjustment amount (IRMAA) uses a two-year lookback on your modified adjusted gross income. A conversion in 2025 can affect your Medicare Part B and D premiums in 2027. Thresholds adjust annually for inflation.

Because of these moving parts, Roth conversions are very much a “measure twice, cut once” planning move.

When to Be Cautious or Avoid Conversions

You may want to avoid or limit conversions if:

You’d jump into a much higher combined federal + state bracket.
You’re approaching Medicare, and the extra income would push you into a significantly higher IRMAA bracket.
You rely on ACA premium tax credits, and the extra income from a conversion would sharply reduce or eliminate those credits.
You have a short investment horizon and may need the funds soon, leaving little time for tax-advantaged growth to outweigh the upfront tax cost.
You don’t have cash outside the IRA to pay the tax, and would have to withhold a large portion of the conversion for taxes.

4 Steps To Execute a Roth Conversion

Step 1: Evaluate Your Financial Situation

Assess your current tax bracket, income sources, and long-term goals.
Ensure you have funds set aside to pay taxes on the conversion.

Step 2: Calculate the Tax Impact

Use a Roth conversion calculator or tax projection software.
Decide how much you can convert while staying within a target tax bracket.
Factor in state income taxes, NIIT (Net Investment Income Tax), IRMAA thresholds, and ACA credits if applicable.

Step 3: Execute the Conversion

If converting an IRA:
- Ask your custodian for a trustee-to-trustee Roth conversion.
If converting a workplace plan (401(k)/403(b)):
- See if the plan allows in-plan Roth conversions, or roll funds to a Roth IRA if eligible.
Keep records of each conversion amount and year, since each has its own tax reporting and (if you’re under 59½) a separate five-year “conversion clock.”

Step 4: Pay the Taxes

Plan ahead for the extra income tax due on the converted amount.
Consider quarterly estimated tax payments or tax withholding to avoid underpayment penalties.
Avoid using converted IRA funds themselves to pay the tax if you’re under 59½; that can trigger additional penalties.

Planning Tip: Many households spread conversions over multiple years to “fill up” a desired tax bracket instead of doing one large conversion that pushes them into a much higher bracket.

How Much Should I Convert?

The amount that you want to convert will depend on your situation.

As fee-only financial planners, we first analyze our clients’ projected tax liability to determine if a Roth conversion benefits them. This involves comparing the current tax cost of converting IRA assets to a Roth IRA against future tax liabilities. The goal is to identify a conversion strategy that minimizes overall taxes paid over the long term and maximizes the amount of client wealth.

In our above hypothetical scenario involving Bill and Jen, they convert about $27,000 to $48,000 of their pre-tax 401(k) to a Roth each year, just enough to fill up their 10% tax bracket.

Note: This Roth conversion story about Bill and Jen is a hypothetical client scenario. Financial planning recommendations and actual results may vary significantly, and future outcomes are not guaranteed. The annual rate of return assumptions started at 6.5% and decreased to 4.9% over time. Please consult your financial advisor before attempting a Roth conversion.

What Risks Are Involved With A Roth Conversion?

Roth conversions involve several real risks and tradeoffs:
- Higher tax bill now:
  The converted amount is taxed as ordinary income in the year of conversion.
- Medicare IRMAA surcharges:
  Higher income can increase Medicare Parts B and D premiums two years later.
- NIIT exposure:
  If your income exceeds certain thresholds, more of your investment income may be subject to the 3.8% Net Investment Income Tax.
- Loss of ACA subsidies (pre-Medicare):
  Higher income can reduce or eliminate premium tax credits, especially after the enhanced credits expire unless extended.
- State tax impact:
  Conversions are usually taxable at the state level too, which can be significant in high-tax states.
- Legislative risk:
  Tax law can change, including future rules around Roth accounts.
Because of these risks, Roth conversions should typically be evaluated as part of a comprehensive tax and retirement plan, not as a one-off move.

The Two Five-Year Rules for Roth IRAs

Rule	What It Covers	When It Applies	Penalty Risk
Earnings Rule	Tax-free withdrawal of earnings	Roth IRA must be open 5 tax years and owner is 59½+ (or meets an exception)	Taxes if withdrawn early
Conversion Rule	Withdrawal of converted pre-tax amounts	Each conversion has its own 5-year clock; relevant if under 59½	10% penalty if withdrawn early

Converted funds must remain in the Roth IRA for five years to avoid penalties, even if you're over 59½.

Timeline: The five-year clock starts on January 1 of the conversion year.
Multiple Conversions: Each conversion has its own five-year rule.

Related: Can you make a Backdoor Roth IRA contribution? Find out here!

What Is A Roth IRA Conversion Ladder?

A Roth conversion ladder is an advanced strategy often discussed by people targeting early retirement. The idea is:

While you’re still working or in your early retirement years, you convert an amount from pre-tax accounts into a Roth each year.
You wait at least 5 tax years for each conversion.
Once the 5-year period (and, ideally, age 59½) is satisfied, you can draw on those converted amounts without the 10% early withdrawal penalty.

Here’s a simplified, purely hypothetical example:

You want to retire at 55 and need about $70,000 per year from age 55 to 59.
Starting at age 50, you convert roughly $70,000 per year from a traditional IRA or 401(k) to a Roth IRA for five years (ages 50–54).
Each year’s conversion becomes available five years later (subject to the Roth ordering rules and other requirements).
- The conversion at 50 can potentially be tapped at 55.
- The conversion at 51 can potentially be tapped at 56.
- And so on.

In reality, this requires careful coordination with other income sources, tax brackets, ACA subsidies, and the Roth IRA ordering rules (contributions, then conversions, then earnings). It’s not a simple DIY strategy and is not appropriate for everyone.

Who Should Avoid A Roth Conversion?

A Roth conversion isn’t right for everyone. Avoid it if:

You’re in a High Tax Bracket: Converting now may result in higher taxes than you’d pay in retirement.
Short Investment Horizon: If you’re close to retirement, there may not be enough time for tax-free growth to offset the upfront taxes.
Insufficient Cash to Pay Taxes: Paying taxes from the converted amount can reduce the effectiveness of the strategy.

Frequently Asked Questions About Roth Conversions

Is there a dollar limit on Roth conversions?
There’s no specific dollar cap, but every dollar you convert is taxable as ordinary income (to the extent it was pre-tax), subject to pro-rata rules if you have both pre-tax and after-tax IRA money.
Will a conversion satisfy my RMD?
No. You must take your RMD first, and that amount cannot be converted. Only funds above the RMD can be converted.
Can I undo a Roth conversion if I change my mind?
No. Under current law, Roth conversions made in 2018 and later cannot be recharacterized (undone). You can still recharacterize contributions in some situations, but not conversions. So it’s important to plan carefully before you convert.
Will a Roth conversion trigger state taxes?
In most states with an income tax, yes. The converted amount will typically count as taxable income at the state level.
Does a conversion affect Social Security taxation?
Possibly. Higher income from a conversion can increase the portion of your Social Security that is taxable in that year.

Is a Roth Conversion Worth It?

A Roth conversion can be a powerful retirement tax strategy, but it’s not for everyone. The key is to convert the right amount at the right time to reduce lifetime taxes, improve retirement flexibility, and potentially leave a tax-free inheritance.

Roth conversions are usually best evaluated in the context of a comprehensive financial plan and multi-year tax projection, not in isolation.

Take the Next Step With District Capital

If you’re wondering whether a Roth conversion makes sense for you in 2025, 2026, or beyond, you don’t have to figure it out alone.

At District Capital Management, we’re a fee-only financial planning firm. We help clients:

Model different Roth conversion strategies
Understand the tradeoffs with RMDs, IRMAA, and ACA subsidies
Coordinate conversions with Social Security, pensions, and other income
Build a long-term, tax-aware retirement income plan

If you’d like to explore how Roth conversions could fit into your broader plan, consider scheduling a free consultation with one of our financial advisors. We’ll help you evaluate the pros and cons in the context of your goals, tax picture, and risk tolerance, so you can make a more informed decision.

Alvin Carlos

Alvin Carlos, CFP®, CFA is a fee-only financial planner, in Washington, D.C. He has a Master’s degree in International Relations from SAIS-Johns Hopkins. Alvin is the founder of District Capital, a financial planning firm designed to help professionals in their 30s and 40s maximize their money and retire by 55, through holistic financial planning and research-driven investing. Schedule a free discovery call today.

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Disclaimer: District Capital Management is a registered investment adviser. The information provided in this blog is for educational and informational purposes only and should not be construed as investment advice. Investing involves risk, including the possible loss of principal. Nothing in this blog should be interpreted to state or imply that past results are an indication of future performance. We recommend that you consult with a qualified financial advisor before making any investment decisions.

District Capital is an independent, fee-only financial planning firm. We help professionals and entrepreneurs in their 30s and 40s elevate their finances and maximize their money. We are based in Washington, D.C and we work with people virtually nationwide.