What Is a Roth Conversion? Benefits, Taxes, and Key Planning Strategies
A Roth conversion can be one of the most powerful tax-planning strategies available, but it’s also one of the most misunderstood. Done at the right time, a Roth conversion can reduce future taxes, create more flexibility in retirement, and help preserve wealth for your heirs. Done at the wrong time, it can create an unnecessary tax bill and hurt your overall financial plan.
Before converting retirement assets, it’s important to understand what a Roth conversion is, who may benefit from one, and who may want to avoid it.
What Is a Roth Conversion?
A Roth conversion occurs when you move money from a pre-tax retirement account, such as a traditional IRA or an old 401(k), into a Roth IRA.
The amount converted is generally treated as taxable income in the year of the conversion. In exchange for paying taxes now, the money can potentially grow tax-free inside the Roth IRA, and future qualified withdrawals can be taken tax-free.
For example, if you convert $50,000 from a traditional IRA to a Roth IRA, that $50,000 is added to your taxable income for the year.
Why Are Roth Conversions Popular?
The primary reason investors consider a Roth conversion is simple: pay taxes now in exchange for tax-free income later.
Some of the potential benefits include:
Tax-Free Retirement Income
Qualified Roth IRA withdrawals are generally tax-free. This can provide valuable flexibility in retirement when managing taxes and income sources.
No Required Minimum Distributions (RMDs)
Unlike traditional IRAs, Roth IRAs do not require account owners to take annual distributions during their lifetime. This allows assets to continue growing tax-free for longer.
Tax Diversification
Many retirees accumulate most of their wealth in tax-deferred accounts. A Roth conversion can help create a mix of taxable, tax-deferred, and tax-free assets, giving you more options when generating retirement income.
Potential Estate Planning Benefits
While beneficiaries may still be subject to distribution rules, inherited Roth IRA distributions are generally income tax-free. This can make Roth assets attractive for wealth transfer planning.
Protection Against Future Tax Increases
No one knows what future tax rates will be. If tax rates rise over time, paying taxes at today’s rates through a Roth conversion may prove beneficial.
How Conversions Reduce Future RMDs
Every dollar you convert to a Roth IRA is a dollar that will not be subjected to lifetime RMDs for the original account owner.
Traditional IRAs and 401(k)s require you to take minimum withdrawals starting at age 73 or 75. Those withdrawals are fully taxable. If your account has grown significantly, the RMDs can push you into a higher bracket, increase the taxable portion of your Social Security, and trigger Medicare surcharges.
Roth IRAs have no RMDs during your lifetime. A smaller pre-tax balance means smaller future RMDs, and more control over your taxable income in your 70s and 80s.
For someone with $800,000 in a traditional IRA today, projected RMDs at age 75 could easily run $35,000 to $45,000 per year. Converting a portion now reduces that number and gives you more flexibility later.
Who Should Consider a Roth Conversion?
Not everyone should complete a Roth conversion, but certain situations can make the strategy especially attractive.
Individuals in a Lower Tax Bracket
If you’re temporarily in a lower tax bracket than you expect to be in later, a Roth conversion may make sense.
Examples include:
- Recently retired but not yet collecting Social Security
- Young adults just starting their careers
- Taking a sabbatical or career break
- Experiencing a temporary reduction in income
- Business owners with an unusually low-income year
Retirees Before RMD Age
The years between retirement and required minimum distributions can be an excellent window for Roth conversions.
Many retirees find themselves with lower taxable income during this period, creating an opportunity to convert assets at relatively favorable tax rates.
Investors with Large Pre-Tax Retirement Accounts
Individuals who have accumulated substantial balances in traditional IRAs and 401(k)s may face significant future RMDs. Strategic Roth conversions can help reduce future required distributions and the taxes associated with them.
Those Focused on Legacy Planning
If leaving assets to children or grandchildren is a priority, Roth conversions may help create more tax-efficient inheritances.
When Is the Best Time to Do a Roth Conversion?
The best time to do a Roth conversion is often during years when your taxable income is temporarily lower than normal.
Some of the most common Roth conversion opportunities include:
- The years between retirement and Social Security
- Before RMDs begin
- During a market downturn
- During a temporary reduction in income
- After a business loss or large deduction
A well-timed Roth conversion can allow you to move assets into a Roth IRA while paying taxes at a lower rate than you might face later.
How Much Should You Convert?
A common misconception is that you should convert your entire IRA at once. In reality, many investors benefit from a series of smaller Roth conversions spread over several years.
A common strategy is to convert enough each year to fill your current tax bracket without pushing yourself into the next one.
For example, if you’re retired and currently in the 22% federal tax bracket, you may convert enough to reach the top of that bracket while avoiding the 24% bracket.
The right conversion amount depends on factors such as:
- Your current tax bracket
- Future income expectations
- Social Security timing
- Medicare IRMAA thresholds
- Available cash to pay taxes
For many retirees, a multi-year Roth conversion strategy is more effective than a single large conversion.
Who Should Avoid a Roth Conversion?
While Roth conversions can be powerful, they are not always the right move.
Individuals in High Tax Brackets
Converting assets while in a very high tax bracket may result in paying more taxes than necessary. In some cases, waiting for a lower-income year may provide a better outcome.
People Who Need the Money Soon
A Roth conversion works best when the assets can remain invested for several years. If you’ll need the money immediately, the tax cost may outweigh the potential benefits.
Those Using IRA Assets to Pay the Taxes
Generally speaking, Roth conversions are most effective when taxes can be paid using cash from outside the retirement account you are converting. Using the converted retirement assets to pay the tax bill reduces the amount remaining invested and can diminish the strategy’s benefits.
Individuals Near Important Income Thresholds
Additional income from a Roth conversion can have unintended consequences, including:
- Higher Medicare premiums through IRMAA (Income-Related Monthly Adjustment Amount)
- Increased taxation of Social Security benefits
- Loss of certain tax credits or deductions
- Higher Affordable Care Act insurance premiums
The goal is not to convert as much as possible. It is to convert the right amount at the right time. A Roth conversion should always be coordinated with a broader tax strategy.
Avoid the IRMAA Trap
IRMAA (Income-Related Monthly Adjustment Amount) is a Medicare surcharge applied to Part B and Part D premiums when your income exceeds certain thresholds.
IRMAA surcharges are based on your modified adjusted gross income from two years prior. So your 2026 income affects your 2028 Medicare premiums. For married couples filing jointly, the first IRMAA tier currently kicks in above $218,000 in MAGI (thresholds adjust annually). A large Roth conversion could push you over that line and cost you hundreds of dollars per month in higher premiums.
This is not a reason to avoid converting. It is a reason to plan conversions with Medicare costs in mind. Sometimes a slightly smaller conversion keeps you under the threshold and saves more in premiums than the extra conversion would have saved in future taxes.
This is exactly the kind of detail that gets missed when your tax planning and investment planning happen in separate conversations with separate professionals.
The 5-Year Rule Explained
The Roth IRA 5-year rule is one of the most misunderstood parts of conversion planning. There are actually two separate rules worth knowing.
Rule 1: The 5-year rule for earnings
To take tax-free withdrawals of investment earnings from a Roth IRA, the account must have been open for at least five years, and you must be 59 ½ or older. If you open your first Roth IRA at 58, you would need to wait until 63 to access earnings tax-free.
Rule 2: The 5-year rule for each conversion
Each conversion has its own five-year clock for penalty-free withdrawal of the converted principal before age 59 ½. If you are already past 59 ½, this rule generally does not apply to you.
What this means for pre-retirees:
If you are converting in your late 50s or early 60s, the earnings clock is the one to watch. If you might need to access Roth funds before 63 or 64, make sure you understand which dollars are available without penalty and which are not.
The short version: if you are converting now and do not plan to touch the money for several years, the 5-year rule is manageable. It just needs to be part of your timeline.
How to Build a Conversion Strategy That Fits Your Plan
A Roth conversion strategy is not a one-time decision. It is a multi-year plan that requires you to track your income, bracket position, Medicare thresholds, Social Security timing, and account balances year after year.
Here is a straightforward framework:
- Build a multi-year tax projection. Map your income for the next 10 years. When does Social Security start? When do RMDs begin? Are there pension payments, rental income, or business proceeds on the horizon? A multi-year tax projection helps identify future tax brackets, potential IRMAA surcharges, and the years when Roth conversions may be most advantageous.
- Identify your low-income years. These are your conversion windows. Model how much you can convert each year without crossing into the next bracket or triggering IRMAA.
- Decide how much to convert each year. Fill the tax bracket, but do not blow past it.
- Pay the tax from outside funds. Keep the converted amount fully invested. Use a taxable brokerage account or savings to cover the tax bill.
- Revisit annually. Income changes. Tax law changes. Your plan should keep up.
This is where working with a CFP®-led team makes a real difference. At Korhorn Financial Group, the OnePlan process is built for exactly this kind of multi-year coordination. The Discover phase maps your full financial picture. The Design phase builds a tax-efficient retirement income strategy around it. The Deploy phase puts it in motion and adjusts as your life changes.
Is a Roth Conversion Right for You?
A Roth conversion can be a valuable strategy for reducing future taxes, creating tax-free retirement income, and improving financial flexibility. However, the benefits depend heavily on your specific circumstances.
The key question isn’t whether Roth conversions are good or bad. The real question is whether paying taxes today is likely to result in lower lifetime taxes than waiting until later.
For some investors, the answer is clearly yes. For others, keeping assets in traditional retirement accounts may be the better choice.
Your Next Wise Step
That’s why Roth conversions work best when evaluated as part of a comprehensive financial plan that considers taxes, retirement income, Medicare, estate planning, and long-term goals together. By taking a strategic approach, a Roth conversion can become an important tool for building a more tax-efficient retirement.
If you are between 50 and 65 and want to know whether a Roth conversion belongs in your plan, the team at Korhorn Financial Group can walk you through it.
Schedule a meeting and start building a plan that makes your retirement income work as efficiently as possible.
FAQ
There is no legal limit. The practical limit is how much you can convert without pushing yourself into a higher bracket or triggering IRMAA surcharges. Most pre-retirees benefit from spreading conversions over several years rather than moving a large lump sum all at once.
It depends on where you live. Some states, like Indiana, tax retirement income, so a conversion would generally be subject to state income tax in the year it is completed. States with no income tax, like Florida or Texas, generally do not tax Roth conversions.
A few states, like Michigan, provide exclusions that can potentially reduce or eliminate state tax on some conversion income, depending on age and circumstances. Your advisor should factor state taxes into the conversion math.
Yes. You can roll a traditional 401(k) directly into a Roth IRA, and it counts as a conversion. The converted amount is taxable in the year of the rollover. Many people do this after leaving an employer or retiring — especially before Social Security begins.
You cannot undo a Roth conversion after the fact. The option to reverse a conversion was eliminated by the Tax Cuts and Jobs Act. This is why careful planning and conservative estimates matter before you pull the trigger.
Not directly — your Social Security benefit amount is not reduced. But the conversion income increases your MAGI, which can make more of your Social Security taxable in that year. Up to 85% of benefits can be taxable depending on your combined income. Another reason to model the full picture before converting.
There is no hard cutoff, but the math becomes less favorable as you age. If you are already taking RMDs and in a high bracket, conversions may not move the needle much. That said, conversions can still make sense in your 70s if your heirs will benefit from inheriting a Roth IRA — they will not owe income tax on qualified distributions. It depends on your goals.
If you open your first Roth IRA at 60, the five-year clock starts on January 1 of that year. You would need to wait until 65 to take tax-free withdrawals of earnings. Converted principal is generally accessible without penalty once you are past 59½. And if you already have an existing Roth IRA from earlier years, that earlier clock applies to all your Roth accounts.
Mike Bernard is a CERTIFIED FINANCIAL PLANNER™ at Korhorn Financial Group. He also holds his Chartered Financial Consultant (ChFC®) and Accredited Investment Fiduciary (AIF®), and Enrolled Agent (EA) designations and is the host of The Wise Money Show.
This information is for general financial education and is not intended to provide specific tax, legal, or investment advice. The examples provided are hypothetical and are for illustrative purposes only. Readers should consult their tax advisor, attorney, and financial professional before implementing any strategy discussed in this article. Korhorn Financial Group does not provide legal advice. Tax planning services are offered through appropriately licensed professionals.
