The Basics

What Is a Roth Conversion and How Does It Actually Work?

A Roth conversion is the process of moving money from a pre-tax retirement account — a Traditional IRA, a 401(k), a SEP-IRA, or a SIMPLE IRA — into a Roth IRA. It sounds straightforward, but the mechanics have important tax implications that are worth understanding fully before you pull the trigger.

Here's the key distinction: Traditional IRAs and 401(k)s are funded with pre-tax dollars. You get a tax deduction when you contribute, the money grows tax-deferred, and then you pay ordinary income taxes when you withdraw it in retirement. A Roth IRA works the opposite way — you contribute after-tax dollars, the money grows tax-free, and qualified withdrawals in retirement are completely tax-free.

When you convert, you're essentially paying the tax bill now instead of later. The amount you convert gets added to your taxable income for that year and is taxed at your ordinary income tax rate. After that, the converted funds live in your Roth IRA and grow tax-free for the rest of your life — and beyond, since Roth IRAs can pass to heirs tax-free as well.

The Case for Converting Now

Why 2025 May Be a Good Time to Consider a Roth Conversion

The timing argument for Roth conversions in 2025 is genuine. The Tax Cuts and Jobs Act of 2017, which reduced individual income tax rates significantly, is currently set to expire at the end of 2025 unless Congress acts to extend it. If those provisions sunset as scheduled, tax brackets could revert to pre-2018 levels — meaning rates go up for many households. Converting pre-tax retirement assets at today's potentially lower rates, before any increases take effect, is the core logic behind the current urgency around Roth conversions.

But the tax rate argument isn't the only reason to consider converting. Here are the other major benefits worth understanding:

Eliminating Required Minimum Distributions. Traditional IRAs and 401(k)s require you to start taking withdrawals — called Required Minimum Distributions — at age 73, whether you need the money or not. Those forced withdrawals are taxable, can push you into a higher tax bracket, and can even trigger surcharges on your Medicare premiums. Roth IRAs have no RMDs during your lifetime. Converting pre-tax funds to a Roth removes the RMD obligation on those assets, giving you full control over when and how much you withdraw — which can be enormously valuable in managing your tax burden in retirement.

Tax-free growth that compounds over time. Once funds are in a Roth IRA, every dollar of growth — dividends, interest, capital gains — accumulates completely tax-free. The longer your time horizon, the more powerful this becomes. A $100,000 conversion that grows to $300,000 over 20 years means $200,000 in gains that will never be taxed. For younger investors or those with a long runway before retirement, this compounding advantage can be substantial.

Estate planning advantages. Roth IRAs pass to beneficiaries tax-free, making them one of the most efficient wealth transfer vehicles available. When heirs inherit a Traditional IRA, they're required to pay ordinary income taxes on every withdrawal. When they inherit a Roth IRA, those withdrawals are tax-free. For families with estate planning goals, this distinction can represent a significant amount of tax savings across generations.

The Honest Trade-Offs

When a Roth Conversion Might NOT Be the Right Move

For all its advantages, a Roth conversion isn't automatically the right answer — and making this decision without considering the downsides can backfire. Here's when it may make more sense to wait or skip the conversion entirely.

One of the most critical — and most overlooked — points about Roth conversions is how you pay the tax. The ideal approach is to pay the tax bill from non-retirement funds, such as taxable savings or checking accounts. If you pay the taxes by withholding from the conversion amount itself, you're reducing the principal that goes into the Roth IRA and losing all the future tax-free compounding on that withheld amount. Over decades, this can meaningfully reduce the benefit of converting.

The Medicare surcharge issue is also worth flagging. If a large conversion pushes your modified adjusted gross income above certain thresholds, you could trigger Income-Related Monthly Adjustment Amounts (IRMAA), which add surcharges to your Medicare Part B and Part D premiums for the following year. For retirees already on Medicare, this is an important planning consideration that often gets missed in generic Roth conversion advice.

Strategy and Timing

How to Approach a Roth Conversion the Right Way

If you've decided a Roth conversion makes sense for your situation, the next question is how to do it strategically. Here's what a thoughtful approach looks like in practice.

Convert gradually over multiple years. Rather than converting your entire pre-tax balance at once — which could spike your taxable income dramatically — most financial advisors recommend converting in annual increments designed to fill up your current tax bracket without crossing into the next one. For example, if you're in the 22% bracket and have room before reaching the 24% threshold, you might convert just enough each year to use that space efficiently. Spreading conversions over five to ten years can produce significantly better outcomes than a single large conversion.

Target low-income years. The best time to convert is when your income is temporarily lower than usual. Early retirement — the window between when you stop working and when you claim Social Security or start RMDs — is often the ideal conversion window. During this period, your income may be lower than it will be once Social Security and RMDs kick in, which means you're converting at a lower effective tax rate.

Watch the five-year rule. Roth conversions come with a five-year clock. To make qualified, penalty-free withdrawals from converted funds, the money generally needs to have been in the Roth IRA for at least five years and you need to be at least 59½. Each conversion starts its own five-year clock, so planning the timing of conversions relative to when you might need to access the funds matters.

Consider account values during market downturns. When market values are temporarily lower, converting the same number of shares results in a lower taxable amount — meaning you pay less in taxes for the same amount of future growth potential. Periods of market weakness can actually be strategic windows for Roth conversions, though this requires coordination with your overall investment strategy.

Putting It All Together

Is a Roth Conversion Right for You?

The right answer depends entirely on your specific situation — your current tax bracket, your expected income in retirement, your account balances, your time horizon, your estate planning goals, and whether you have non-retirement funds available to pay the conversion tax. There's no universal answer, and anyone who tells you Roth conversions are always a good idea or always a bad idea isn't giving you real financial advice.

What's clear is that for many people — particularly those in their 50s and early 60s who are approaching retirement, have meaningful pre-tax balances, and expect tax rates to stay the same or rise — a thoughtful, multi-year Roth conversion strategy can be one of the most impactful retirement planning moves available. It reduces future tax exposure, eliminates RMD obligations, and creates a pool of tax-free income that gives you significant flexibility in managing your retirement cash flow.

The key word in that sentence is "thoughtful." A Roth conversion done without proper tax modeling, without considering the bracket impacts, and without a multi-year strategy is unlikely to deliver the benefits you're hoping for. This is an area where working with a fiduciary financial advisor who can run the actual numbers for your situation — not just explain the concept — makes a meaningful difference in the outcome.