A partial Roth conversion moves a portion of your traditional IRA or 401(k) to a Roth IRA, letting you pay taxes gradually instead of all at once. This strategy helps you stay in lower tax brackets while building tax-free retirement income. Most people convert over several years to minimize their total tax bill.
You’ve probably heard that Roth conversions are a smart move for retirement. And they can be. But here’s what nobody tells you: converting your entire IRA at once could push you into a much higher tax bracket and cost you thousands more than necessary.
That’s where partial conversions come in. In our 30 years of helping clients plan for retirement, we’ve seen this strategy save people significant money on taxes while still getting them to tax-free income in retirement. It just takes a bit more patience.
This guide covers everything you need to know about partial Roth conversions, including when they make sense, how to calculate your optimal amount, and the mistakes we see people make most often.
What Is a Partial Roth Conversion?
A partial Roth conversion is exactly what it sounds like. Instead of moving your entire traditional retirement account to a Roth IRA, you move just a portion of it. Maybe $20,000 this year, another $25,000 next year, and so on.
Here’s why this matters. When you convert to a Roth, the amount you convert gets added to your taxable income for that year. Convert $200,000 all at once and you could jump from the 22% tax bracket to the 35% bracket. Convert $40,000 per year over five years and you might stay in the 22% bracket the whole time.
The money works the same way once it’s in the Roth. It grows tax-free, and qualified withdrawals in retirement are completely tax-free. The only difference is how much you pay in taxes to get it there.
Why Partial Conversions Beat Full Conversions
Let’s look at an example. Say you’re in the 22% tax bracket and you have $100,000 in a traditional IRA.
Full conversion approach: You convert the entire $100,000. The first portion stays in your 22% bracket, but the rest pushes you into 24% and possibly 32%. Depending on your specific situation, your total tax bill might be $26,000 or more.
Partial conversion approach: You convert $25,000 per year for four years, staying within the 22% bracket each time. Your total tax bill is around $22,000.
That’s potentially $4,000 saved just by being patient. And depending on your situation, the savings could be much larger.
The partial approach also gives you flexibility. Tax laws change. Your income changes. Market conditions change. Converting smaller amounts each year lets you adjust your strategy as things evolve.
When Partial Roth Conversions Make the Most Sense
Not every year is created equal when it comes to conversions. We’ve found that certain situations create ideal windows for larger partial conversions.
Early retirement years are often the sweet spot. If you retire at 60 but don’t start Social Security until 67, you might have several years with lower taxable income. This is prime time for conversions because you can fill up lower tax brackets before required minimum distributions and Social Security kick in.
Market downturns create unexpected opportunities. When your account value drops, you can convert more shares for the same tax cost. If you converted $50,000 worth of stock during a 20% market dip, you’d get 25% more shares than at the previous value. When the market recovers, all that growth happens tax-free inside your Roth.
Years with unusual deductions also work well. Maybe you had major medical expenses, made large charitable contributions, or had business losses. These deductions create room to convert more without jumping brackets.
Career transitions between jobs sometimes create lower-income years. Use them wisely.
How to Execute a Partial Roth Conversion
The actual mechanics are straightforward. You have three options for getting the money from your traditional account to your Roth IRA.
The trustee-to-trustee transfer is what we recommend for most people. Your financial institution moves the money directly from one account to the other. You never touch the funds, which eliminates any risk of missing deadlines or triggering penalties.
A same-trustee transfer works similarly if both accounts are at the same institution. It’s essentially a simple recharacterization within your existing accounts.
The 60-day rollover is riskier. You take a distribution, and you have exactly 60 days to deposit it into a Roth IRA. Miss that deadline by even one day and the IRS treats the entire amount as a taxable distribution. We’ve seen this go wrong too many times to recommend it.
Once the conversion is complete, you’ll receive a Form 1099-R reporting the distribution and a Form 5498 showing the Roth contribution. The converted amount appears on your tax return as ordinary income.
The Five-Year Rule You Can’t Ignore
Each Roth conversion comes with its own five-year clock. This trips people up more than almost anything else.
Here’s how it works. To withdraw converted funds without a 10% early withdrawal penalty, that specific conversion must have been in your Roth IRA for at least five years. The clock starts on January 1 of the year you made the conversion.
So if you convert money in October 2025, the five-year period begins January 1, 2025. You can withdraw those specific funds penalty-free starting January 1, 2030.
The key thing to understand is that each conversion has its own clock. If you convert money in 2025 and again in 2026, those are two separate five-year periods. The 2025 conversion becomes accessible in 2030, the 2026 conversion in 2031.
This matters most for early retirees who need to access funds before age 59½. If you’re already past 59½, the penalty doesn’t apply anyway, though you’ll still want to meet the five-year rule for completely tax-free withdrawals.
Calculating Your Optimal Conversion Amount
The goal is to convert as much as possible while staying within your current tax bracket. This takes some planning, but it’s not complicated once you understand the approach.
Start by estimating your taxable income for the year without any conversion. Include wages, investment income, pension payments, Social Security (if applicable), and any other income sources.
Next, look at where your current bracket ends. For 2025, the 22% bracket ends at $97,300 for single filers and $194,600 for married filing jointly. The 24% bracket ends at $206,700 and $413,350 respectively.
The difference between your projected income and the top of your bracket is your “conversion space.” That’s how much you can convert while staying in your current bracket.
Our Roth conversion calculator can help you run the numbers for your specific situation. It shows exactly how different conversion amounts affect your tax bill.
One important note: it’s sometimes worth converting into the next bracket if the rate difference is small. Paying 24% now might beat paying 32% later when required minimum distributions push your income higher.
The Backdoor Roth Strategy for High Earners
If your income is too high to contribute directly to a Roth IRA, you’re not out of luck. The backdoor Roth strategy lets high earners get money into a Roth indirectly.
Here’s how it works. You make a non-deductible contribution to a traditional IRA (there are no income limits for this). Then you convert that traditional IRA to a Roth. Since you already paid taxes on the contribution, you only owe taxes on any earnings.
The catch is something called the pro-rata rule. If you have other traditional IRA money that came from deductible contributions, the IRS won’t let you convert just the non-deductible portion. You have to treat all your traditional IRA money as one pool and convert proportionally.
For example, if you have $95,000 in deductible traditional IRA funds and you add $5,000 in non-deductible contributions, only 5% of any conversion would be tax-free. The other 95% would be taxable.
The workaround is to roll your existing traditional IRA into your employer’s 401(k) if the plan allows it. That clears out the pre-tax money and lets you do a clean backdoor conversion.
The Roth Conversion Ladder for Early Retirees
If you’re planning to retire before 59½, the conversion ladder is worth understanding. It’s a way to access retirement funds early without penalties.
The strategy works like this. Each year, you convert a portion of your traditional IRA to a Roth. After five years, you can withdraw that converted amount penalty-free, even if you’re under 59½.
By starting conversions five years before you need the money, you create a “ladder” of accessible funds. Year one’s conversion becomes available in year six, year two’s conversion in year seven, and so on.
This requires advance planning and enough other savings to bridge the first five years. But for those who can make it work, it’s a powerful way to access retirement funds early while still benefiting from tax-free growth.
Common Mistakes We See
After three decades in this business, we’ve seen the same mistakes over and over. Here are the ones to avoid.
Converting too much at once is the most common error. People get excited about tax-free growth and convert more than they should, pushing themselves into higher brackets and paying more than necessary.
Paying conversion taxes from the IRA itself reduces the benefit significantly. If you convert $50,000 and use $10,000 from the IRA to pay taxes, you only have $40,000 growing tax-free. Pay the taxes from a separate account if at all possible.
Forgetting about required minimum distributions causes problems for people over 73. You must take your full RMD before doing any conversions that year. The IRS considers the first money out of a traditional IRA to be RMD, and RMDs can’t be converted.
Ignoring the Medicare impact surprises many people. Large conversions can trigger higher Medicare premiums through IRMAA (Income-Related Monthly Adjustment Amount). Medicare looks at your income from two years prior, so a big conversion in 2025 could increase your premiums in 2027.
Skipping years without reason wastes opportunities. Each year you don’t convert is a year that money grows in a taxable account instead of a tax-free one.
Tax Implications to Understand
The converted amount is taxed as ordinary income in the year of conversion. This is true regardless of how the money was originally invested or whether it includes gains.
State taxes add another layer. Most states with income taxes will also tax the conversion, though rates and rules vary. A few states don’t tax retirement income at all, which could factor into timing if you’re planning a move.
The IRMAA surcharge mentioned earlier can add thousands to your Medicare costs. For 2025, single filers with modified adjusted gross income above $106,000 pay higher Part B and Part D premiums. The surcharges increase at several income thresholds up to $500,000. That said, while conversions can trigger short-term premium increases, they can actually reduce your lifetime Medicare costs. Roth withdrawals don’t count toward MAGI in future years, so you may pay less in IRMAA surcharges over time.
On the positive side, once money is in the Roth, it’s truly tax-free. Qualified withdrawals pay zero federal tax. There are no required minimum distributions during your lifetime. And your heirs can inherit the account tax-free, though they’ll need to withdraw the funds within 10 years under current rules.
If you’re exploring all your tax-free retirement options, you might also want to compare Roth IRAs with IUL strategies. Some people find that an IRA rollover to IUL better fits their situation.
Frequently Asked Questions
Can anyone do a Roth conversion regardless of income?
Yes. Unlike direct Roth IRA contributions, which have income limits, anyone can convert to a Roth regardless of how much they earn. There’s no income ceiling for conversions.
Can I undo a Roth conversion if I change my mind?
No. Before 2018, you could “recharacterize” a conversion back to a traditional IRA. That option no longer exists. Conversions are permanent, which makes planning even more important.
Do I have to convert from a traditional IRA first, or can I convert directly from a 401(k)?
You can convert directly from a 401(k) or other employer plan to a Roth IRA. A prior rollover to a traditional IRA isn’t required. Some employer plans also offer in-plan Roth rollovers to a designated Roth account within the same plan.
What if I need the money before five years?
You can withdraw converted funds before five years, but you’ll pay a 10% early withdrawal penalty if you’re under 59½. After 59½, the penalty doesn’t apply. The five-year rule still affects whether earnings come out tax-free.
Is there ever a reason to do a full conversion all at once?
Sometimes. If you have an unusually low-income year, a very small IRA balance, or strong reason to believe tax rates will increase dramatically, a full conversion might make sense. For most people, though, partial conversions over time are more tax-efficient.
Key Takeaways
- Partial conversions save money by keeping you in lower tax brackets compared to converting all at once
- Timing matters because low-income years, market downturns, and early retirement create the best conversion opportunities
- Each conversion has its own five-year clock for penalty-free withdrawals before age 59½
- Pay taxes from outside funds to maximize the amount growing tax-free in your Roth
- Consider Medicare impacts since large conversions can trigger higher premiums two years later
- Use a calculator to find your optimal conversion amount each year
Ready to Plan Your Conversion Strategy?
Partial Roth conversions can be one of the smartest moves you make for retirement. The key is getting the numbers right for your specific situation.
Want help figuring out what makes sense for you? We’re happy to talk through your options. No pressure, no pitch, just an honest conversation about what might work.
