Roth Conversion for Federal Employees: 2026 TSP In-Plan Guide
A Roth conversion for federal employees is a different calculation than it is for private-sector workers, because your retirement income stacks three predictable, mostly taxable layers on top of each other: a FERS or CSRS pension, Social Security (for FERS), and Traditional Thrift Savings Plan withdrawals. That stack pushes your taxable income up in a way a 401(k)-only retiree rarely sees, so the question is not whether your bracket rises in retirement but by how much, and how much of your Traditional TSP you move to Roth before it does.
A Roth conversion moves pre-tax Traditional TSP dollars into a Roth balance, adding the converted amount to this year’s ordinary income in exchange for tax-free growth and no lifetime required minimum distributions later. As of January 28, 2026, you can do this inside the plan without rolling to an IRA (Source: FRTIB final rule, Federal Register doc 2026-00765, 2026). There is no income limit and no dollar cap on how much you convert.
How a Roth conversion for federal employees changes your tax math
A federal retiree’s income often stays high: a FERS or CSRS pension, Social Security, and Traditional TSP required minimum distributions all arrive as ordinary income. That stack can put the RMD years in a higher bracket than the early-retirement years a fed controls, which is why converting Traditional TSP to Roth before those layers begin is a common federal planning question.
Most retirement calculators assume income falls at retirement. For a career fed, it often does not fall far. Your FERS Basic Benefit annuity arrives monthly, Social Security starts when you claim it, and your Traditional TSP faces required minimum distributions at age 73, or 75 if you were born in 1960 or later (Source: IRS, SECURE 2.0, 2026). All three are ordinary income. CSRS retirees, with a larger pension and little or no Social Security, can sit on an even higher taxable-income floor (Source: opm.gov CSRS Information, 2026).
The planning consequence: a fed frequently retires in a lower bracket than the one their own RMDs will later create. That inverted timeline is one reason many feds consider converting Traditional TSP to Roth in the years they control, before the pension, Social Security, and mandatory withdrawals lock the bracket in. This page covers the mechanics and the two situations, early special-provisions retirement and the survivor tax trap, where the federal case diverges from a generic Roth article. It supplements our main guide to Roth conversion planning.
TSP roth in-plan conversion 2026: what launched January 28
The TSP launched Roth in-plan conversions on January 28, 2026, under an FRTIB final rule published in the Federal Register on January 15, 2026 (doc 2026-00765). Eligible participants can convert Traditional TSP balances to Roth without rolling out to an IRA. If you hold no Roth balance yet, your first conversion creates one. The change was announced in TSP plan news in 2025 (Source: tsp.gov).
This news hook reshaped federal Roth planning. For years the only way to get TSP money into a Roth was to separate and roll it to a Roth IRA; that workaround is now obsolete for the conversion itself. Eligibility is broad: active employees at any age, separated participants, and spousal beneficiaries can convert. There is no income limit, which matters for the GS-14, GS-15, and SES employees whose salaries would bar a direct Roth IRA contribution (Source: tsp.gov Roth In-Plan Conversions, 2026). For a refresher, see what a Thrift Savings Plan is.
TSP in-plan roth conversion rules and minimums
You request an in-plan conversion at tsp.gov. The TSP allows up to 26 conversions per account each calendar year, and each conversion must be at least $500 (Source: tsp.gov Roth In-Plan Conversions, 2026). The conversion is permanent and cannot be reversed, and it must be completed by December 31 to count for that tax year, so each conversion’s size is a figure to model before submitting.
A few federal-specific mechanics matter. Money in the TSP mutual fund window has its own handling, which makes those balances a factor to review before converting. The converted amount is taxed as ordinary income for the year (Source: tsp.gov Roth In-Plan Conversions, 2026). Because the conversion is irreversible, the pre-2018 recharacterization escape hatch is gone: once you convert, the tax is owed, so each conversion’s size is a decision to model in advance, not undo in April.
The TSP roth conversion tax bomb: paying the tax from outside funds
The “tax bomb” is the ordinary-income tax due on every converted dollar. To make a conversion work, the tax should generally be paid from money outside the TSP, a taxable brokerage or savings account, not from the converted balance itself. Paying from the conversion shrinks the Roth you were trying to build and, before age 59 and a half, can trigger a penalty on the withheld portion.
Liquidity drives the federal decision here. A fed with a taxable account can convert more per year than one whose only savings is the TSP. It also argues against converting a large lump sum in one year, which can spike your bracket and your Medicare surcharges at once. Spreading conversions across several lower-income years, covered below, keeps the tax bill payable from outside cash and stops a single conversion from spiking your bracket.
TSP roth conversion vs roth IRA rollover
Since January 2026 you can convert inside the TSP, so rolling to a Roth IRA first is optional. In-plan conversions keep the low-cost TSP funds and the G Fund; a Roth IRA offers more investment choice and flexible withdrawals. One gotcha: rolling a Roth TSP balance out to a Roth IRA does not carry over the TSP holding-period start date, so the Roth IRA’s own five-year clock applies (Source: tsp.gov Roth rollover fact sheets, 2026).
| Feature | TSP in-plan Roth conversion | Roll to Roth IRA, then convert or hold |
|---|---|---|
| Available since | January 28, 2026 (Source: FRTIB, 2026) | Only after separation from service |
| Investment menu | TSP core funds plus G Fund; low cost | Broad market; your choice of custodian |
| Conversions per year | Capped at 26 per account (Source: tsp.gov, 2026) | No per-year conversion cap at the IRA |
| Five-year clock | TSP Roth clock; not carried over on later rollout | Roth IRA starts its own clock on rollover |
| Withdrawal flexibility | Governed by TSP withdrawal rules | More flexible ordering and access |
| RMDs on Roth | No lifetime RMDs on Roth TSP since 2024 (Source: SECURE 2.0) | No lifetime RMDs on Roth IRA |
Neither is universally better; the choice depends on whether you value the G Fund and low fees or the flexibility of a Roth IRA.
How much of my TSP should I convert to roth each year
The common approach is “filling the bracket”: converting only enough to reach the top of the current marginal bracket without spilling into the next one. For a fed, the first step is estimating the taxable income the pension, any Social Security, and planned TSP withdrawals already create, and the remaining room is what a conversion can fill. The 2026 standard deduction is $16,100 single and $32,200 for married filing jointly (Source: IRS, 2026).
Consider an illustrative married-filing-jointly federal couple, both retired, before RMDs begin:
| Income layer (illustrative) | Amount | Notes |
|---|---|---|
| FERS Basic Benefit annuity | $30,000 | Fully ordinary income |
| Social Security (combined) | $30,000 | Partly taxable |
| Traditional TSP withdrawal | $30,000 | Fully ordinary income |
| Gross income | $90,000 | Illustrative only |
| Approximate taxable income | about $53,000 | After the $32,200 MFJ standard deduction and up to 85% SS inclusion (Source: IRS Pub 915) |
With taxable income near $53,000, this couple sits inside the 12% bracket, which for 2026 runs to $100,800 for married filing jointly before the 22% rate begins (Source: IRS Rev. Proc. 2025-32, 2026), leaving room before crossing into a higher one. A conversion sized to that room, with the tax paid from savings, moves Traditional TSP to Roth at a known rate. The figures are illustrative, not a projection of your result. For deeper modeling see how much to convert to Roth.
Building a roth conversion ladder for federal employees
A conversion ladder is a series of partial annual conversions, each sized to fill your bracket, repeated across your low-income years. For feds it converts a large Traditional TSP methodically rather than in one taxable spike. Each conversion also starts its own five-year availability clock on the converted principal, so a ladder can build a schedule of amounts that become penalty-free to withdraw over time.
The ladder is generally used across the gap years between retirement and RMDs. A fed who retires at 57 and faces no RMDs until 73 has roughly a decade and a half of conversion years. Converting a slice each year can lower lifetime taxable income and shrink the RMD that would otherwise stack on the pension and Social Security. See required minimum distributions for 2026 for the withdrawal rules a ladder is designed to reduce.
Roth conversion gap years before RMD
Gap years are the low-income window between retirement and RMDs, often before Social Security is claimed. This is a low-income window many use for conversions, and federal special-provisions employees have an unusually long one. The FERS Special Retirement Supplement faces a Social Security earnings test, but a Roth conversion is not wages or self-employment income, so converting does not reduce your supplement (Source: opm.gov FERS Annuity Supplement FAQ; 5 U.S.C. 8421a, 2026).
Law enforcement officers, firefighters, air traffic controllers, and CBP officers can retire as early as 50, or face mandatory separation at 57, and often collect an immediate unreduced annuity plus the FERS Special Retirement Supplement until age 62. That gives a special-provisions retiree a 15-to-20-year runway before RMDs at 73 or 75, one of the longer conversion windows in the federal retirement system. The supplement itself is reduced $1 for every $2 of earnings over the annual exempt amount, which is $24,480 for 2026, up from $23,400 in 2025 (Source: SSA Exempt Amounts Under the Earnings Test, 2026). Because a Roth conversion is not earned income, a special-provisions retiree can run an aggressive conversion ladder through those years without touching the supplement. Quantifying that runway, year by year, is a core part of federal conversion planning.
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Age considerations for federal employees doing roth conversions
There is no one age that suits everyone, but a window many feds consider runs from the year after separation until the year before RMDs, with a caution zone starting at 63. Because Medicare surcharges use a two-year income lookback, income at age 63 can affect Part B and Part D premiums at 65. Many feds concentrate larger conversions in their late 50s and early 60s, then taper.
Timing also interacts with Social Security. Converting before you claim keeps taxable income lower per conversion, because the pension and TSP alone leave more bracket room than the pension, TSP, and Social Security combined. Delaying Social Security while converting in the interim is a common federal sequence, and it can soften the Social Security tax torpedo, the sharp rise in the taxable share of benefits as other income grows.
The TSP roth conversion five-year rule (there are two)
Two separate five-year clocks apply. The first governs tax-free earnings: a Roth account must be open five years, and you must be 59 and a half, for the earnings to come out tax-free. The second governs penalty-free access to each converted principal amount, which generally must season five years to avoid the 10% early-withdrawal penalty (Source: IRS Pub 590-B, 2026) before 59 and a half. They run on different triggers, so both clocks apply independently.
For feds this interacts with the Rule of 55, which allows penalty-free TSP withdrawals if you separate in or after the year you turn 55, or age 50 for special-provisions employees. That rule helps with plan withdrawals, but it does not erase the five-year seasoning on converted principal. And moving a Roth TSP balance to a Roth IRA does not carry the TSP holding period over; the Roth IRA’s clock starts fresh (Source: tsp.gov Roth rollover fact sheets, 2026), so any rollout carries that clock reset.
IRMAA and roth conversions for retirees
IRMAA is the income-related surcharge added to Medicare Part B and Part D premiums above set income thresholds. It uses a two-year modified adjusted gross income lookback, so your income at 63 sets your surcharge at 65, and it works as a cliff: one dollar over a threshold moves you to the next tier. A large Roth conversion can push a fed over a bracket, so conversions after 63 need surcharge modeling.
Feds have one advantage private early retirees lack. Because you keep FEHB coverage in retirement, you have no Affordable Care Act premium subsidy to protect, so the ACA subsidy cliff that constrains many private early retirees does not limit your conversions. For a fed, IRMAA is effectively the main income-based ceiling once Medicare is near, and each conversion interacts with the current Medicare IRMAA 2026 brackets and premiums.
Roth conversion strategy for FERS retirees
A federal-specific factor is the survivor tax trap. When one spouse dies, the survivor often keeps a large FERS survivor annuity plus continuing RMDs but must file as single, at compressed brackets and lower IRMAA thresholds. Converting aggressively while both spouses are alive and filing jointly moves money to Roth at the wider MFJ brackets, before the survivor is taxed as a single filer on nearly the same income.
This survivor, or widow’s, penalty is one federal reason some couples consider front-loading conversions during the joint-filing years. A surviving spouse with a 50% FERS survivor annuity (Source: opm.gov, 2026), the deceased spouse’s Social Security, and undiminished Traditional TSP RMDs can land in a higher bracket as a single filer than the couple ever hit together. See the widow’s penalty for 2026 for how the bracket compression works.
Two more specifics shape FERS and CSRS strategy. CSRS retirees, with larger pensions and generally no Social Security, often start from a higher taxable floor, which can strengthen the case for converting earlier; note that WEP and GPO, which had cut Social Security for some retirees, were repealed by the Social Security Fairness Act, Public Law 118-273, signed January 5, 2025. And timing a conversion after relocating from a high-tax duty station to a no-income-tax state can lower the state tax, since the conversion is taxed where you reside that year.
Mandatory roth catch-up contributions 2026 federal employees
Separate from conversions, SECURE 2.0 section 603 requires that age-50-plus catch-up contributions be made as Roth for high earners, effective 2026. The trigger is prior-year FICA wages above a threshold that started at $145,000 in 2022 and is indexed (Source: IRS; SECURE 2.0 section 603). This affects many GS-13, GS-14, GS-15, and SES employees, and LEOs whose overtime pushes wages over the line.
The 2026 TSP elective deferral limit is $24,500, with an $8,000 age-50 catch-up and an enhanced $11,250 catch-up for ages 60 to 63 (Source: IRS Notice 2025-67, 2026). If your prior-year wages clear the section 603 threshold, the catch-up portion must go to Roth TSP rather than Traditional. For a high-earning fed that pairs with a conversion plan: you are already building Roth on the contribution side, and converting Traditional balances extends the same after-tax positioning to earlier savings.
How Rothology plans a Roth conversion for federal employees
Rothology® Premier Roth Conversion is a flat-fee, fiduciary planning service from Q3 Advisors. For federal clients it builds a multi-year conversion plan around your FERS or CSRS pension, TSP balances, gap-year window, and IRMAA and survivor-filing exposure, with tax projections and annual reviews. Q3 Advisors sells no products. Typical clients hold $750,000 or more in pre-tax assets.
The engagement is educational first. Planning starts with a factual review of your pension estimate, TSP statement, expected Social Security, and retirement date, then models how much Traditional TSP could be converted each year within your bracket and Medicare surcharge constraints. Special-provisions retirees get a year-by-year runway map of their gap years; married clients get the survivor-filing hedge quantified. Any tax outcome depends on your facts and future law, so figures are projections, not guarantees. You can begin from the parent Roth conversion service overview.
Frequently asked questions
Can I convert my Traditional TSP to Roth while I’m still working as a federal employee?
Yes. Since the TSP added Roth in-plan conversions on January 28, 2026, eligibility includes active employees at any age, not only separated participants (Source: FRTIB final rule, Federal Register doc 2026-00765, 2026). You do not have to leave federal service or reach a certain age to convert. The converted amount is added to that year’s ordinary income, so working-year conversions land on top of your salary, which usually means smaller conversions while employed.
When did TSP in-plan Roth conversions become available?
The feature launched January 28, 2026. It was authorized by an FRTIB final rule published in the Federal Register on January 15, 2026 (doc 2026-00765) and announced in TSP plan news in 2025 (Source: tsp.gov). Before that date, the only route from Traditional TSP to a Roth account was to separate from service and roll the balance to a Roth IRA, which is no longer required for the conversion itself.
Can I undo or reverse a TSP Roth conversion?
No. A TSP Roth in-plan conversion is permanent and cannot be reversed (Source: tsp.gov Roth In-Plan Conversions, 2026). The recharacterization option that let taxpayers unwind a conversion was eliminated for conversions after 2017. Because the tax on the converted amount is locked in once you convert, each conversion’s size and tax are best modeled before the request is submitted, rather than planned to undo later.
Is there an income limit to do a TSP Roth conversion?
No. Roth conversions have no income limit and no dollar cap, which is different from direct Roth IRA contributions, where 2026 eligibility phases out between $153,000 and $168,000 for single filers and $242,000 and $252,000 for married filing jointly (Source: IRS IR-2025-111, 2026). A high-earning GS-15 or SES employee who cannot contribute to a Roth IRA can still convert Traditional TSP to Roth, subject to the TSP conversion rules.
Should I convert inside the TSP or roll it to a Roth IRA first?
It depends on what you value. Converting inside the TSP keeps low-cost funds and the G Fund and is available now to eligible participants (Source: tsp.gov, 2026). Rolling to a Roth IRA offers broader investments and more flexible withdrawals, but a rollout of Roth TSP money starts a fresh five-year clock at the IRA rather than carrying the TSP holding period over. The choice follows from investment and withdrawal preferences.
Will converting to Roth lower my future required minimum distributions (RMDs)?
Yes. RMDs apply to Traditional balances, and Roth TSP has no lifetime RMDs, a benefit in effect since 2024 (Source: SECURE 2.0). Every dollar you move from Traditional to Roth is a dollar not counted in the RMD base at age 73, or 75 if you were born in 1960 or later (Source: IRS, 2026). Lower RMDs mean less forced ordinary income stacked on your pension and Social Security later.
Does a Roth conversion count against the FERS Special Retirement Supplement earnings test?
No. The FERS Special Retirement Supplement earnings test counts wages and self-employment income, and reduces the supplement $1 for every $2 over the exempt amount, which is $24,480 in 2026 (Source: SSA, 2026; 5 U.S.C. 8421a). A Roth conversion is neither wages nor self-employment income, so converting Traditional TSP does not reduce your supplement. That makes conversions particularly efficient during special-provisions gap years.
Sources
- FRTIB final rule, “Roth In-Plan Conversions,” Federal Register doc 2026-00765, published January 15, 2026.
- tsp.gov, Roth In-Plan Conversions page and Roth rollover fact sheets (up to 26 conversions per account per year, $500 minimum each); TSP plan news, 2025 (2026).
- IRS Notice 2025-67, 2026 contribution limits; IRS Rev. Proc. 2025-32, 2026 tax brackets and standard deduction; SECURE 2.0 sections 601 and 603.
- opm.gov, FERS Information, CSRS Information, and FERS Annuity Supplement FAQ; 5 U.S.C. 8421a (2026).
- SSA, Exempt Amounts Under the Earnings Test, 2026; Social Security Fairness Act, Public Law 118-273 (January 5, 2025).
This page is educational and factual only. It is not investment, tax, or legal advice, and it is not a recommendation or a personalized plan. Tax outcomes depend on your individual facts and on future changes in law. Verify current figures with the cited primary sources and consult a qualified professional before acting. Q3 Advisors is an SEC-registered investment adviser; our Form ADV is available on request and at adviserinfo.sec.gov. Registration does not imply a certain level of skill or training.