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Roth IRA Conversions Work Best When Timed Right—And That Window Might Be Closing Fast

Missy E
November 14, 2025

Key Takeaways

Converting pre-tax retirement funds to a Roth IRA can lead to significant tax savings—but only if you act during a low-income window, such as early retirement before Social Security or Required Minimum Distributions (RMDs) begin.
The current federal income tax brackets are set to expire after 2025, making now an ideal time to consider Roth conversions before higher rates return.

Why Roth IRA Conversions Appeal to Government Employees

As a government employee, you’ve likely accumulated retirement savings in traditional accounts like the Thrift Savings Plan (tsp) or a traditional IRA. These accounts are tax-deferred, which means you didn’t pay income tax on your contributions, but you will pay taxes on withdrawals in retirement.

A Roth IRA, on the other hand, is funded with after-tax dollars, and qualified withdrawals are tax-free. That tax-free treatment can be incredibly valuable later in retirement—especially when Required Minimum Distributions from your TSP or traditional IRA could push you into a higher tax bracket or trigger Medicare premium surcharges.

How a Roth Conversion Works

When you convert funds from a traditional retirement account to a Roth IRA, you pay ordinary income tax on the amount converted in the year of the conversion. There’s no early withdrawal penalty as long as the funds go directly into the Roth IRA. Once inside the Roth, your investments grow tax-free, and you’re not required to take RMDs during your lifetime.

This strategy gives you more control over your taxable income in retirement and can reduce the total taxes you pay over your lifetime. But the timing must be strategic.

The 2025 Deadline You Can’t Ignore

Under the Tax Cuts and Jobs Act (TCJA) of 2017, tax rates were temporarily lowered across all brackets. However, these reduced rates are set to expire after December 31, 2025, unless Congress acts to extend them.

That means you have through the end of 2025 to potentially convert at today’s lower tax rates. Starting in 2026, unless the law changes, tax rates will revert to the higher pre-2018 levels.

This looming tax rate increase creates a limited window to:

Fill up lower tax brackets now with conversions
Pay less tax on the amount converted
Lock in tax-free growth within a Roth IRA

If you wait until after 2025, you may end up converting the same amount at a higher marginal rate.

Ideal Timing Windows for Public Sector Employees

Your retirement income timeline is different from most private-sector workers, which can give you unique opportunities to benefit from Roth conversions:

Between Retirement and Age 62

If you retire before age 62 and delay Social Security, you may have several years of lower income. This is often the most tax-efficient time to do Roth conversions because:

You may be in a lower tax bracket than while working
You won’t yet be taking Social Security or RMDs
Medicare IRMAA surcharges don’t begin until you enroll in Part B at age 65

You can use this low-income window to convert strategically—perhaps up to the top of your current tax bracket—without triggering unnecessary taxes or penalties.

Before Required Minimum Distributions at Age 73

RMDs begin at age 73 in 2025 (for those turning 73 in or after that year). Once RMDs start, they add to your taxable income whether you need the money or not. This:

Increases your total tax burden
Reduces your flexibility for Roth conversions
May push you into IRMAA thresholds for higher Medicare Part B and D premiums

Converting before RMDs begin can lower future RMD amounts by reducing the size of your traditional accounts.

Watch the Tax Brackets—And Avoid Jumping Too High

Roth conversions are taxed as ordinary income, so the amount you convert is added to your taxable income for the year. You don’t want to convert so much in one year that you accidentally push yourself into a higher bracket than intended.

Here are the 2025 individual tax brackets (projected):

10%: Up to $11,925
12%: $11,926 to $47,150
22%: $47,151 to $100,525
24%: $100,526 to $191,950
32%: $191,951 to $243,725
35%: $243,726 to $609,350
37%: Over $609,350

A common strategy is to convert only enough to stay within a target bracket—like staying under the 24% limit—so you don’t unnecessarily spike your tax bill.

For married couples filing jointly, the brackets are roughly double. If you recently retired or your household income is significantly lower, you may be sitting in a prime bracket for conversion.

Medicare IRMAA: Another Reason to Be Careful

Medicare’s Income-Related Monthly Adjustment Amount (IRMAA) adds surcharges to your Part B and D premiums if your income crosses certain thresholds. For 2025, these thresholds start at $106,000 for individuals and $212,000 for joint filers, based on income from two years prior.

Since Roth conversions count toward Modified Adjusted Gross Income (MAGI), a large conversion could trigger higher Medicare premiums two years later. It’s essential to factor IRMAA into your conversion plan—sometimes it’s worth paying a bit more in taxes if the long-term benefit outweighs the short-term IRMAA increase, but it must be deliberate.

Roth IRA Five-Year Rule

Each Roth IRA conversion comes with a five-year clock. You must wait five tax years before you can withdraw converted funds without a 10% early withdrawal penalty, unless you’re over age 59½.

Note: This rule applies separately for each conversion. So, if you convert in 2025, you must wait until at least January 1, 2030, to access the converted funds penalty-free—unless you meet the age exception.

That makes early retirees who need access to funds especially cautious. You don’t want to convert money now and then find yourself penalized for needing it too soon.

Partial Conversions vs. All at Once

You don’t have to convert everything in one year. In fact, it’s usually better not to. Partial conversions allow you to:

Spread the tax impact over several years
Stay within your desired tax bracket
Avoid IRMAA triggers or loss of tax credits

You can convert gradually up to a bracket ceiling, or until your income approaches an IRMAA threshold. Spreading the process across 2025 and earlier years allows you to leverage the lower tax brackets before they expire.

TSP Considerations for Conversions

As a government employee, your Thrift Savings Plan may be your largest retirement asset. While you can’t convert directly from TSP to a Roth IRA, you can roll over TSP funds to a traditional IRA first, then convert to a Roth IRA.

This process includes:

Rolling over your TSP into a traditional IRA (a non-taxable move)
Then converting the traditional IRA funds into a Roth IRA (a taxable move)

Be sure you understand the timing, tax impact, and withholding options before initiating this process. Once converted, the Roth IRA is no longer subject to RMDs, giving you long-term control and potential tax savings.

Don’t Let the 2025 Opportunity Slip By

With only two tax years left before the current lower tax brackets potentially disappear, 2025 could be your final full year to:

Execute low-tax Roth conversions
Lock in lifetime tax-free withdrawals
Reduce future RMDs and Medicare surcharges

This window is especially valuable for:

Retired government employees not yet claiming Social Security
Married couples filing jointly with temporarily low income
Individuals who retired before age 62

The strategy isn’t right for everyone. You must weigh current tax costs against long-term tax savings, and timing is everything.

Locking In Lifetime Tax-Free Growth Requires Timely Action

Tax planning in retirement isn’t about guessing—it’s about understanding how your income, tax brackets, Medicare premiums, and distribution rules interact. Roth conversions can be an extremely valuable tool, but only when done thoughtfully and within a shrinking window of opportunity.

Before acting, it’s wise to speak with a licensed agent listed on this website who understands government retirement benefits and tax strategy. They can help you build a custom timeline and conversion strategy tailored to your income, assets, and goals.