A Roth conversion is the process of transferring money from a traditional IRA, 401(k), or other pre-tax retirement account into a Roth IRA, with taxes paid on the converted amount in the year of the conversion. Unlike Roth IRA contributions, Roth conversions are available regardless of your income level.
Consider a retiree who leaves the workforce at age 65. Their taxable income drops substantially, but they delay Social Security until age 70 and won’t begin required minimum distributions (RMDs) until age 73, or age 75 for those born in 1960 or later. A few years later, RMDs push them into a higher tax bracket, increase the taxation of their Social Security benefits, and even trigger higher Medicare premiums. If they had strategically converted portions of their traditional IRA during those lower-income years, they may have significantly reduced their lifetime tax burden.
At Platt Wealth Management, every Roth conversion recommendation begins with comprehensive financial planning. As a fee-only fiduciary firm, our focus is always on helping clients like you make decisions that align with their long-term financial goals rather than pursuing one-size-fits-all tax strategies. So, when is the best time to convert a 401(k) to a Roth IRA? Do you know when to convert a traditional IRA to a Roth? Here’s what to consider.
What Is a Roth Conversion?
A Roth conversion moves retirement assets from a tax-deferred account, like a traditional IRA or eligible 401(k), into a Roth IRA, and the amount converted is treated as ordinary taxable income during the year of the conversion. This means a Roth IRA conversion can increase your tax bill in the year it is completed, even though it may improve your long-term tax picture.
Once inside the Roth IRA, your investments will grow tax-free, and qualified withdrawals during retirement are also tax-free. In addition, Roth IRAs aren’t subject to required minimum distributions during your lifetime, which lets your assets continue compounding for decades.
One important consideration is that Roth conversions are permanent. Since the Tax Cuts and Jobs Act eliminated recharacterizations in 2017, you can’t reverse a completed Roth conversion if the markets decline or your circumstances change.
When Does a Roth Conversion Make Sense?
Certain periods create unique opportunities to convert retirement assets at lower tax costs while maximizing future tax-free growth. A thoughtful Roth conversion strategy can help determine when a conversion may be worth the upfront Roth conversion taxes.
After Retirement and Before Social Security or RMDs
For many retirees, the years immediately following retirement represent the single best opportunity for Roth conversions. For example, suppose a retiree has enough room remaining in the 22% federal tax bracket. Rather than waiting until future RMDs push income into the 24% or 32% bracket, they may strategically convert enough of their assets each year to fill the available lower bracket. Over multiple years, this can produce meaningful lifetime tax savings while reducing future RMDs.
During Significant Market Downturns
When investment values temporarily fall, you can convert more shares while paying taxes on a lower account value. If those investments later recover inside the Roth IRA, all of your future appreciation occurs tax-free.
Imagine converting a $100,000 IRA position after a broad market correction. If the account later rebounds to $150,000, the additional $50,000 of appreciation occurs inside the Roth without future federal income taxes, assuming qualified distributions.
In Years With Lower-Than-Usual Taxable Income
Temporary reductions in income, like job transitions or early retirement, sabbaticals, business losses, large charitable deductions, sale of depreciated assets, and temporary reductions in consulting or self-employment income can create opportunities.
Every dollar within a lower tax bracket represents an opportunity to convert retirement assets at a reduced tax cost, and strategic tax planning helps determine exactly how much can be converted.
When Future Tax Rates Are Expected to Rise
If you expect to remain in the same, or a higher, tax bracket throughout retirement, paying taxes today at historically moderate rates may be advantageous over the long term. It’s not possible to predict future legislation with certainty, but locking in known tax rates today can reduce uncertainty and create greater flexibility later.
Key Factors to Evaluate Before Converting
Timing alone doesn’t determine whether a Roth conversion will be beneficial to you. Every recommendation should be evaluated within the context of a comprehensive financial plan that considers your taxes, investments, retirement income, estate planning, and long-term cash flow.
Current vs. Projected Future Tax Rate
If future tax rates are expected to exceed today’s marginal rate, converting often makes financial sense. If retirement income will place you in a substantially lower bracket, maintaining tax deferral may be best.
How the Conversion Tax Will Be Paid
Ideally, conversion taxes should be paid using cash or taxable investment accounts rather than retirement assets, because using IRA funds to pay the tax reduces the amount that’s invested inside the Roth. Investors younger than age 59.5 may also incur a 10% early withdrawal penalty on funds used to pay taxes.
Time Horizon Before Withdrawal
The longer investments remain inside the Roth IRA, the greater the opportunity for tax-free compounding. There’s also the Roth conversion five-year rule, which means converted funds stay in the account for five years before penalty-free access if you’re under age 59.5.
Impact on Medicare Premiums and Other Income-Based Benefits
A Roth conversion may temporarily increase your Medicare Part B and Part D premiums through IRMAA surcharges, taxation of Social Security benefits, Net Investment Income Tax exposure, and other income-based deductions or credits. Secondary effects should always be considered before making a decision.
When a Roth Conversion Does Not Make Sense
You may not want to convert if you don’t have sufficient non-retirement assets to pay the taxes, expect to be in a lower tax bracket, or have an IRA for charitable beneficiaries. It also may not be the right choice if you’ll need the converted funds in the near future, or you’re approaching significant life changes.
Strategies for a Smart Roth Conversion
Rather than viewing Roth conversions as a one-time event, you may benefit from a disciplined, multi-year strategy.
Multi-Year Partial Conversion Strategy
Instead of converting an entire retirement account in one year, you may want to convert smaller amounts annually to fill specific tax brackets. For example:
- Year 1: Convert enough to fill the 22% bracket.
- Year 2: Repeat after reviewing tax projections.
- Year 3: Adjust based on investment performance.
- Year 4: Coordinate with Social Security timing.
- Year 5: Reduce future RMD exposure before age 73.
This approach spreads your tax liability across several years and reduces the likelihood of triggering higher Medicare premiums.
Coordinating With Charitable Giving and Other Tax Moves
Qualified charitable distributions, donor-advised funds, charitable bunching strategies, capital gain harvesting, and even backdoor Roth planning can complement Roth conversions to improve overall tax efficiency.
Conversion as an Estate Planning Tool
Most non-spouse beneficiaries have to withdraw inherited Roth assets within ten years, and qualified withdrawals stay tax-free. For affluent families, converting assets during the parents’ lifetime may mean paying taxes at the parents’ lower marginal rate while leaving beneficiaries a significantly more tax-efficient inheritance.
Common Roth Conversion Mistakes to Avoid
Even if you’re well-intentioned, you can make costly errors, including:
- Converting too much during a single tax year.
- Ignoring state income tax consequences.
- Forgetting the IRA pro-rata rule.
- Converting during years with unusually high bonus or capital gain income.
- Overlooking Medicare IRMAA and Social Security taxation.
- Failing to coordinate conversions with a spouse’s income and tax situation.
Careful tax projections help avoid these preventable mistakes.
How Platt Wealth Management Approaches Roth Conversion Planning
As a San Diego-based, fee-only fiduciary and NAPFA member firm, we integrate Roth conversions into your broader financial picture.
Our planning process typically includes:
- Reviewing prior-year tax returns
- Building multi-year tax projections
- Evaluating retirement income needs
- Coordinating investment allocation decisions
- Integrating estate planning objectives
- Monitoring Medicare and Social Security implications
Rather than recommending conversions based solely on tax brackets, our team is focused on optimizing lifetime after-tax wealth while supporting your broader financial objectives.
Take the Guesswork Out of Your Roth Conversion Decision
The right strategy depends on current income, future tax expectations, retirement goals, investment timeline, estate planning priorities, and numerous other factors. Contacting us for a personalized analysis often reveals opportunities that generic rules of thumb miss.
If you’re evaluating whether a Roth conversion belongs in your retirement strategy, schedule a complimentary consultation with the Platt Wealth Management team. A comprehensive analysis can help determine whether converting now, or waiting, offers the greatest long-term value.
Frequently Asked Questions
What is the difference between a Roth conversion and a Roth contribution?
A Roth contribution involves depositing new after-tax money into a Roth IRA, subject to annual contribution limits and income restrictions. A Roth conversion transfers existing pre-tax retirement assets into a Roth IRA and has no income limitations.
Is there an income limit to do a Roth conversion?
No, anyone may complete a Roth conversion regardless of income level.
How much tax will I pay on a Roth conversion?
The converted amount is generally taxed as ordinary income in the year of the conversion. Your total tax depends on your federal and state tax brackets and other sources of income.
Can I undo a Roth conversion if I change my mind?
No, Roth conversions are generally irreversible under current tax law.
What is the Roth conversion five-year rule?
Each conversion has its own five-year holding period for certain penalty-free withdrawals before age 59.5. Qualified earnings distributions also have separate requirements.
Does a Roth conversion count toward my required minimum distribution?
No, any required minimum distribution for the year must be taken before completing a Roth conversion, and the RMD itself cannot be converted.
Should I do a Roth conversion before or after age 73?
For many retirees, completing strategic conversions before RMDs begin creates greater tax planning flexibility. However, every situation should be evaluated individually.
How does a Roth conversion affect my Medicare premiums?
A Roth conversion increases taxable income, which may trigger IRMAA surcharges for Medicare Part B and Part D two years later. Proper planning can help minimize these additional costs.