I’m 69, Taking Social Security and Have $815k in My 401(k). Is It Too Late for a Roth Conversion?

From a legal and regulatory standpoint, it is never too late for a Roth conversion. Under the rules, you can transfer retirement funds from a tax-deferred account such as a 401(k) to a Roth IRA at 69 or any other age. Whether it makes financial sense to do that is another matter. To determine this, consider first what your future tax rate is likely to be. You may be better off not converting now if tax rates or your income go up too much. Conversion may also impact Medicare premiums and estate plans. Make sure you understand all the implications before you execute a strategy.

A financial advisor can walk you through a Roth conversion and discuss other retirement income strategies.

Context for Roth Conversions

A Roth conversion transfers funds from a 401(k) or other tax-deferred retirement savings account to a Roth IRA. The conversion requires paying taxes now at current income tax rates. However, withdrawals from the Roth will be tax-free. Roth accounts are also exempt from Required Minimum Distribution (RMD) rules. You won’t have to take taxable distributions after retirement and can continue to grow your portfolio. Anyone inheriting your Roth account is exempt from mandatory withdrawals for up to ten years after your estate is settled.

If your goal is to completely avoid RMDs, you have to completely empty your 401(k). Otherwise, the remaining balance will be subject to RMDs. However, it can make sense to convert only part of your 401(k) balance. Keeping a portion of your assets in tax-free accounts gives you flexibility when you do long-term tax planning.

Many savers performing Roth conversions do the process gradually, converting a portion of the funds each year. This can help minimize the current tax impact while spreading it out over several years.

Risks

While Roth conversions offer some appealing advantages, they also have drawbacks. A major one is the need to pay income taxes on converted amounts on your next return. This can lead to a large current tax bill which can also have secondary effects. Roth conversions can also hamper your withdrawal flexibility because of penalties on withdrawals. Under some plans you’d owe penalties on withdrawals taken within five years of the conversion date. So it’s often advisable to only convert funds you won’t need for at least five years.

Another issue is the difficulty of predicting your future tax rates. The current income tax environment features lower rates than at any time in recent history. It’s possible that rates will go even lower, however. If they do it may make more sense to pay taxes on withdrawals later on than at today’s higher rates. Remember, even smaller conversions can push you into a higher tax bracket and hike your current tax bill. By increasing your income conversions can also lead to higher Medicare premiums, expose more of your Social Security benefits to taxation and make you ineligible for certain tax credits.

Roth Conversion Example

If you are a single filer with $100,000 in taxable income, your income puts you in the 22% marginal tax rate for 2026. Your income tax bill is approximately $13,449. Converting the entire $815,000, plus your salary, would put you in the top 37% federal 2026 marginal income tax bracket. This would lead to a one-time tax bill of about $289,743. ¹

If you spread the conversion evenly over four years, assuming zero growth, you get $203,750 each year. The resulting $303,750 in taxable income now puts you in the 35% bracket. Your annual tax bill is roughly $70,347. Over four years this would result in a total added tax of $281,388, saving you $8,355.

A gradual conversion strategy like this would leave some funds in your 401(k), preserving some flexibility for your tax management strategies. It would not expose more of your Social Security benefits to taxation, but would likely cause your Medicare Part B premiums to rise and could affect future tax credits.

How an Advisor Can Help You Determine When to Make a Conversion

A Roth conversion is not a one-size-fits-all decision, and the timing matters as much as the amount. A financial advisor can evaluate your current income, projected future tax rates, account balances, and retirement timeline to determine whether converting now, later, or gradually over several years produces the best outcome. Without that analysis, it is easy to convert at the wrong time. This could generate a tax bill that outweighs the long-term benefit.

One of the most important variables in a Roth conversion decision is your current versus future tax rate. If your income is temporarily lower than usual, such as in the years between retirement and Social Security claiming, a window may exist to convert at a reduced tax cost. A financial advisor can identify those windows and help you take advantage of them before your tax situation changes.

The size of a conversion in any given year has cascading effects that go beyond the immediate tax bill. Converting too much at once can push you into a higher bracket, increase the portion of Social Security benefits subject to taxation, and trigger IRMAA surcharges on Medicare premiums. An advisor can calculate the precise conversion amount that maximizes tax efficiency without crossing thresholds that would make the strategy counterproductive.

For those with significant account balances, a gradual conversion strategy spread over multiple years is often more effective than a single large transaction. A financial advisor can build a multi-year conversion schedule that keeps your taxable income within a target range each year, reducing the total tax paid over the life of the strategy. That kind of systematic planning requires ongoing adjustments as income, tax law, and account values change.

Estate Planning

Estate planning is another dimension that a financial advisor can incorporate into the conversion decision. Roth accounts pass to heirs without immediate RMD requirements, which can be a meaningful advantage depending on the size of your estate and the tax situation of your beneficiaries. An advisor can assess whether the primary benefit of converting is for your own retirement flexibility or for the people who will inherit your assets, and structure the strategy accordingly.

A Roth conversion also intersects with Social Security timing, RMD planning, and Medicare costs in ways that are difficult to model without professional help. A financial advisor can stress-test different conversion scenarios against these variables simultaneously, giving you a complete picture of the tradeoffs rather than optimizing one factor at the expense of another. At a decision point this complex, the cost of professional guidance is modest relative to the tax savings a well-timed strategy can produce.

Bottom Line

Converting an $815,000 401(k) to a Roth IRA at age 69 is doable under the current conversion rules and regulations. It might improve future flexibility in managing taxes, and would allow you to pass your retirement savings on to heirs without saddling them with RMD requirements and the subsequent tax liability. However, it would lead to a sizable current tax bill and, even if spread out over several years, would likely cause your Medicare premiums to rise during the years when you are performing the conversions.

Tips

• Sit down with a financial advisor to get insight into how a conversion might affect your financial future. Finding a financial advisor doesn’t have to be hard. SmartAsset’s free tool matches you with financial advisors in your area, and you can interview your advisor matches at no cost to decide which one is right for you. If you’re ready to find an advisor who can help you achieve your financial goals, get started now.
• Use SmartAsset’s Federal Income Tax Calculator to help you model the potential tax impacts of future financial moves.
• Keep an emergency fund on hand in case you run into unexpected expenses. An emergency fund should be liquid — in an account that isn’t at risk of significant fluctuation like the stock market. The tradeoff is that the value of liquid cash can be eroded by inflation. But a high-interest account allows you to earn compound interest. Compare savings accounts from these banks.
• Are you a financial advisor looking to grow your business? SmartAsset AMP helps advisors connect with leads and offers marketing automation solutions so you can spend more time making conversions. Learn more about SmartAsset AMP.

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