Written by 
Edited by 
Edited by 
Reviewed by 
If you’re 65 years old and collecting Social Security, you may wonder if it’s too late to convert your $750,000 traditional IRA into a Roth IRA. The short answer is no. There are no legal restrictions on Roth conversions based on age or income. Practically, however, the decision involves carefully weighing tax implications, healthcare costs, estate planning and more. Spreading conversions over multiple years often makes the most financial sense for larger IRAs. Guidance from a financial advisor can help you weigh the costs of a Roth conversion in your circumstance.
Roth Conversion Basics
A Roth IRA conversion involves moving funds from a traditional, pre-tax IRA into an after-tax Roth IRA account. You pay income tax on the money that gets converted now, but future withdrawals in retirement come out tax-free.
Plus, traditional IRAs are subject to required minimum distributions (RMDs) starting at age 75 for those born in 1960 or later. This can lead to higher taxes in retirement as RMD income, which is treated as ordinary taxable income, can push retirees into higher tax brackets. RMD rules do not apply to Roth IRAs during the original owner’s lifetime, and since 2024, this same exemption extends to Roth 401(k)s as well. Qualified withdrawals from a Roth IRA are tax-free, but earnings may be taxable if withdrawn before satisfying the five-year rule and age requirements.
If you need additional help navigating the rules surrounding Roth IRAs, consider speaking with a financial advisor.
Why Timing Your Roth Conversion Matters
The sooner you convert funds from your traditional pre-tax IRA to a Roth account, the more years of tax-free growth you’ll enjoy in your Roth account. And you’ll be able to withdraw those Roth funds without owing any taxes.
But you will have to pay taxes on the conversion, which is no small consideration when it comes to timing. Converting a large IRA can require you to pay the top marginal tax rate of 37% on most or even all of the entire conversion amount, depending on your other income, deductions and additional factors.
If you convert it gradually, however, you can spread the income bump out over several years and avoid subjecting it to the top marginal tax rate. This can help reduce the tax owed each year and overall.
Traditional and Roth accounts offer different tax benefits, but both play a role in retirement income. Run your numbers through SmartAsset’s retirement calculator to see how they might work together.
It’s also worth thinking about when you expect to use the converted funds. Each Roth conversion has its own five-year clock. If you are under age 59 ½, withdrawing converted amounts within five years can trigger a 10% penalty. However, at age 65, the early withdrawal penalty would not apply, though the five-year rule still determines whether earnings qualify for tax-free treatment.
If you complete multiple partial conversions over several years, each conversion amount carries its own separate five-year period, which can affect the timing and tax treatment of future withdrawals.
Meeting with a financial advisor can provide clarity on complex moves like Roth conversions.
Converting a $750,000 IRA
A major concern in converting a $750,000 IRA balance at once would be the significant tax bill that would accompany such a transaction. Completing a Roth conversion of that size would push the person into the 37% marginal tax bracket.
If you’re a single filer and your Social Security income isn’t high enough to be taxed, adding $750,000 to your current income could trigger nearly $228,000 in extra taxes, using the 2026 tax brackets. Going slowly with $75,000 converted per year over 10 years reduces the tax hit each year by keeping your taxable income in the 22% bracket.
Here’s how those scenarios might play out, assuming you are a single filer and you take the standard deduction (other deductions are not considered here):
Scenario 1: Converting $750,000 All at Once
- Size of Roth conversion: $750,000
- Tax bracket: 37%
- Estimated federal income tax owed on conversion: $68,228 over 10 years
This option leaves you with a massive tax bill but around $522,500 in your new Roth IRA, which you’ll eventually be able to withdraw tax-free.
Scenario 2: Annual $75,000 Conversions Over 10 Years
- Size of Roth conversion: $75,000 (x10)
- Tax bracket: 22%
- Estimated Federal income tax owed on conversion: $76,700 over 10 years
Keep in mind that funds left in your IRA will continue to grow while you’re executing these annual conversions, so the IRA likely won’t be empty by the time you have to start taking RMDs. However, the RMDs you’ll have to take by then will be much smaller so won’t incur nearly as much taxation compared to leaving the money in a traditional IRA.
A third option is to leave the money unconverted in your IRA and start taking RMDs once you turn 75, paying taxes on them as you go. However, this could leave you paying higher taxes in retirement until your death. But if you need more help taking stock of your different options, this free matching tool can pair you with a fiduciary advisor.
Making the Call
You may not find that one course of action is clearly superior. Factors to consider when deciding if and how much Roth conversion makes sense:
- Compare current vs. future income tax rates
- Account for RMDs and estate plans
- Weigh healthcare and other senior costs
- Assess tax impact on heirs
- Model multi-year scenarios
Strategic partial Roth conversions tailored to your situation may provide the most tax advantages for people with large IRA balances.
One major limitation to Roth conversions is that they cannot be reversed. If tax rates decline later or you need converted funds sooner, you could regret having locked in taxes now at a higher rate. Inheritance plans may also change. Do a thorough multi-year analysis before committing to convert.
Run your own Roth conversion scenarios first or enlist the help of a financial advisor to help you make these important calculations.
How a Roth Conversion Affects Your Social Security Tax Bill
The tax scenarios earlier in this article show the federal income tax on the conversion itself, but they do not account for what happens to your Social Security benefits in the same year. For someone already collecting benefits, this is a cost that can add thousands of dollars to the real price of the conversion.
The IRS determines how much of your Social Security is taxable by adding three numbers together: your gross income from all other sources, any interest earned on tax-exempt investments and half of your annual Social Security payment. The result is what the IRS calls provisional income. A Roth conversion adds directly to the income side of that formula. Every dollar you convert raises your provisional income by a dollar.
The more provisional income you have, the more of your Social Security gets taxed. A single filer whose provisional income stays below $25,000 pays no federal tax on benefits. Between $25,000 and $34,000, the IRS taxes up to half. Above that, up to 85% is taxable. Joint filers hit those same two tiers at $32,000 and $44,000 respectively. Most retirees doing Roth conversions will land in the top tier, where 85 cents of every Social Security dollar shows up as taxable income.
Here is what that looks like in practice. Say you collect $30,000 per year in Social Security and have $12,000 in other income. Your provisional income before any conversion is $27,000 ($12,000 plus half of $30,000). At that level, only about $1,000 of your Social Security benefit ends up being taxable, based on the IRS worksheet used to calculate this, since the taxable portion depends on how far provisional income exceeds the relevant threshold, not a flat percentage of the total benefit.
Now add a $75,000 Roth conversion to that same year. Your provisional income jumps to $102,000, pushing you into the 85% Social Security taxation tier, meaning $25,500 of your benefits are now counted as income instead of just $1,000. That extra $24,500 in newly taxable Social Security gets added to the $75,000 conversion and your $12,000 of other income, for a total of $112,500 in AGI.
After the standard deduction and a partially phased-out senior deduction, taxable income comes to $90,600, and the federal tax owed is $14,644, an effective rate of about 19.5% on the conversion itself. Without the conversion, you’d have owed $0 in federal tax that year, since your standard deduction alone exceeds your AGI. The jump illustrates why a Roth conversion in a Social Security year can cost more than the marginal bracket alone suggests, since it’s not just the conversion that gets taxed, but a much larger share of benefits that would otherwise have stayed untouched.
This does not mean you should avoid converting. It means the true cost of each conversion is higher than the income tax on the converted amount alone, and your annual conversion target should be set with Social Security taxation factored into the math, not discovered after the fact.
The 10-Year Window You Cannot Get Back
At 65 with Social Security as your primary income source, you are sitting in what is likely the lowest-tax stretch of your remaining financial life. Understanding why requires looking at what happens at 75.
Once you reach 75, RMDs from your traditional IRA begin whether you need the money or not. On a $750,000 balance, your first-year RMD would be roughly $30,500 based on current IRS life expectancy tables. That amount hits your tax return as ordinary income every year going forward, and it grows as the IRA balance grows or as the IRS divisor shrinks with age.
After RMDs begin, they stack on top of your Social Security. A $30,500 RMD plus $30,000 in Social Security gives you nearly $60,000 in income before you do anything else. Add a Roth conversion on top of that and you are pushed into higher brackets with far less room to maneuver than you have right now.
Between 65 and 74, your taxable income is largely within your control. Social Security may be your only significant income source, which means your tax bracket is relatively low and there is room to fill the lower brackets with conversion income before hitting the thresholds that trigger higher rates, additional Social Security taxation and Medicare premium surcharges.
Every year you wait, that window gets shorter. And once RMDs begin, the flexibility disappears. You cannot convert your RMD to a Roth. You must take it first, pay the tax on it, and then convert additional funds on top of that if you still have bracket space left.
For this reader specifically, the question is not whether it is too late. It is not. The question is how to use the next 10 years as efficiently as possible. That means sizing each annual conversion to fill available bracket space without triggering unnecessary Social Security taxation or Medicare surcharges, paying the conversion tax from outside funds when possible so the full amount goes into the Roth, and front-loading conversions in the earlier years of the window when the IRA balance is at its current level rather than waiting until it has grown larger and the remaining window is shorter.
A financial advisor can model the year-by-year numbers for your specific situation, including Social Security, Medicare premiums, state taxes and projected IRA growth, and set conversion amounts for each year that balance the tax cost against the long-term benefit of getting money into the Roth while the window is still open.
Frequently Asked Questions (FAQ)
When might a Roth conversion make sense?
A Roth conversion may be worth considering if you expect to be in a higher tax bracket in the future, want to reduce future required minimum distributions (RMDs), or are seeking greater tax diversification in retirement. It can also be useful in years when your taxable income is temporarily lower than usual.
Do Roth conversions help reduce required minimum distributions?
Yes, but indirectly. Converting pre-tax retirement funds into a Roth IRA reduces the balance in accounts that are subject to RMDs. Since Roth IRAs are not subject to lifetime RMDs for the original owner, future mandatory withdrawals may be lower. However, you must take any RMD for the current year before completing a conversion, and that RMD amount cannot be converted.
How do Roth conversions affect heirs?
Roth IRAs can offer tax advantages for beneficiaries, as qualified withdrawals are generally tax-free. However, most non-spouse beneficiaries must still distribute the inherited Roth IRA within 10 years under current federal rules. Even so, eliminating future income tax on withdrawals can make Roth accounts attractive in estate planning.
Bottom Line
At 65 or any age, spreading Roth conversions over multiple years can offer flexibility, balancing today’s tax bill against tax savings for you and your heirs down the road. The right amount to convert each year isn’t a fixed formula; it depends on where you sit today and where you expect to be years from now, which is exactly why a multi-year tax picture matters more than any single year’s numbers.
That’s the core tension a financial professional can help you work through before you commit to anything. “Even though you are taking Social Security, it is not too late for you to complete a Roth Conversion. With that said, how much you convert depends on a multitude of factors, including current and future tax brackets, Medicare premium surcharges, and your desire for greater tax diversification. Because Roth Conversions cannot be undone, a tax professional should be consulted.” said Matthew Hofacre, MSPFP, CFP®, EA.
Matthew Hofacre, MSPFP, CFP®, EA provided the quote used in this article. Please note that Matthew is not a participant in SmartAsset AMP, is not an employee of SmartAsset and has been compensated. The opinion voiced in the quote is for general information only and is not intended to provide specific advice or recommendations.
Retirement Planning Tips
- Instead of guessing if converting your IRA makes sense, talk to a financial advisor who can crunch the numbers. Finding a financial advisor doesn’t have to be hard. SmartAsset’s free tool matches you with vetted financial advisors who serve your area, and you can have a free introductory call with your advisor matches to decide which one you feel is right for you. If you’re ready to find an advisor who can help you achieve your financial goals, get started now.
- Direct Roth IRA contributions are subject to IRS income limits that adjust periodically. If your income exceeds the threshold for your filing status, you may not qualify to contribute directly. Some higher earners consider a “backdoor Roth” strategy, which involves contributing to a traditional IRA and then converting those funds to a Roth IRA, subject to applicable tax rules.
Photo credit: ©iStock.com/zimmytws, ©iStock.com/Panupong Piewkleng, ©iStock.com/kate_sept2004