TSP Rollover to IRA: Should Federal Employees Leave the G Fund Behind?

The Thrift Savings Plan is one of the best employer retirement plans in the world — ultra-low expense ratios, a guaranteed-principal fund with no private-market equivalent, and penalty-free access under the Rule of 55 for anyone who separates at 55 or later. Once you roll to an IRA, all three are gone permanently. This guide explains what you're actually trading when you move your TSP out.

Why TSP rollovers are different from typical 401(k) rollovers

When a private-sector employee leaves a job with a 401(k), the standard advice is roughly: "compare fees, roll to an IRA if your old 401(k) has high-cost funds." The TSP breaks that logic. Its expense ratios are already below what most IRA custodians can match, and it offers one fund — the G Fund — that has no equivalent anywhere outside the federal system. Before initiating a TSP rollover, you need to evaluate what you're actually giving up, not just where the money is going.

The G Fund: the only reason to think twice

The G Fund is a U.S. government securities fund that earns interest calculated monthly by the U.S. Treasury as the weighted average yield of Treasury securities with four or more years to maturity.¹ As of May 2026, the annualized G Fund rate is 4.500%.

What makes this unusual is what it is not: a money market fund, a bond fund, or a stable-value fund. Unlike a bond fund, the G Fund principal does not fluctuate with interest rates — you cannot lose money in it. Unlike a money market, it earns intermediate-to-long-term Treasury yields even though the capital is perfectly safe. No IRA product replicates this combination.

Expense ratios: the smallest real difference

TSP expense ratios for 2026, per tsp.gov:²

Practically speaking, the difference between the TSP's C/S/I funds and the cheapest IRA index equivalents is less than 3 basis points — less than $30 per year on $100,000 invested. Expense ratios are not a meaningful reason to stay in the TSP if you're talking about index equity exposure. The G Fund is the real differentiator.

The Rule of 55: what rolling to an IRA permanently forfeits

Under IRC § 72(t)(2)(A)(v), the 10% early withdrawal penalty does not apply to distributions from an employer plan if you separate from service in the calendar year you turn 55 or later.³ For the TSP, this means: if you leave federal employment at age 55 or older, you can take any amount from your TSP without penalty — useful for bridge income before other sources kick in at 59½ or 62.

Public safety employees (federal law enforcement officers, customs and border protection officers, federal firefighters, and air traffic controllers) qualify at age 50 under IRC § 72(t)(10).⁴

The correct approach if you're under 59½ and want penalty-free access: keep at least enough in the TSP to cover two to four years of anticipated distributions before rolling the rest to an IRA. The TSP allows partial withdrawals, so you can take what you need from the TSP and still roll the remainder to an IRA simultaneously — preserving both the G Fund option and the Rule of 55 penalty exception for the portion you leave.

What you gain by rolling to an IRA

Despite everything above, there are genuine reasons to roll the TSP:

• Roth conversion access. The TSP does not allow partial in-plan Roth conversions. To convert traditional TSP dollars to Roth, you must first roll to a traditional IRA, then convert. If you're in a low-income year between retirement and Social Security and want to execute a multi-year Roth conversion ladder, you need the TSP out of the TSP first.
• Investment universe. The TSP has five core funds (G, F, C, S, I) plus L Fund lifecycle blends. An IRA opens individual stocks, sector ETFs, real estate, commodities, and any publicly traded instrument. If your retirement strategy requires specific exposures the TSP cannot provide, a rollover makes sense.
• Consolidated account management. Federal employees often separate with TSP + 401(k) from a prior private-sector job + IRA balances. Rolling into one IRA simplifies RMD calculations, beneficiary designations, and annual rebalancing.
• Estate planning flexibility. Traditional IRAs allow stretch provisions for surviving spouses and certain eligible designated beneficiaries (EDBs) that the TSP's beneficiary participant account program also offers — but IRA custodians typically provide more granular control over distributions to heirs.

Roth TSP: lifetime RMDs are no longer a reason to roll

Prior to SECURE 2.0, the Roth TSP had one significant disadvantage vs. a Roth IRA: it was subject to lifetime required minimum distributions, just like a traditional 401(k). Under SECURE 2.0 § 325, that changed effective January 1, 2024: designated Roth accounts in employer plans — including the Roth TSP — are no longer subject to lifetime RMDs.⁵

This eliminates the most common reason federal employees rolled their Roth TSP to a Roth IRA. If your plan was "roll Roth TSP to Roth IRA to avoid lifetime RMDs," that rationale is gone. The Roth TSP and Roth IRA are now identical on this dimension.

Important Roth TSP rollover trap: If you roll a Roth TSP to a Roth IRA, the five-year qualified distribution clock does not transfer. The Roth TSP has its own five-year clock starting from the first year of Roth contributions to the TSP. The Roth IRA uses a separate five-year clock starting from the first year of any contribution to any Roth IRA. If your Roth IRA is newer than your Roth TSP, rolling in can reset the qualified distribution clock, requiring another five-year wait for penalty-free earnings. See the analysis in our Roth 401(k) rollover guide — the mechanics are identical.

The Backdoor Roth pro-rata trap on TSP rollovers

If you rely on the Backdoor Roth IRA strategy, rolling your traditional TSP balance to a traditional IRA will likely destroy it. The IRS calculates your pro-rata tax fraction across all pre-tax IRA balances on December 31 of the conversion year. A $500,000 TSP rolled to a traditional IRA makes a $7,500 non-deductible Roth conversion nearly entirely taxable — the same trap that applies to any pre-tax employer plan rolling to an IRA.

The clean solution: if you have traditional IRA balances you want to keep pro-rata-clean, do not roll the TSP to a traditional IRA. Options:

• Roll the TSP directly to a Roth IRA in a taxable conversion (the entire balance becomes ordinary income in the rollover year — useful only in low-income years)
• If you're still employed, execute a reverse rollover of any existing traditional IRA balances into the TSP before separating. The TSP accepts rollovers from traditional IRAs while you're an active participant. This removes the IRA pre-tax balance from the pro-rata calculation — then roll the TSP later without contaminating IRA space.
• Keep the traditional TSP in the TSP permanently, never touching traditional IRA balances, and fund Backdoor Roth through the IRA contribution directly

Three real scenarios

Scenario A: Federal retiree, age 58, $780,000 in TSP — mostly G Fund, no private-sector IRA

David retired from the Department of Defense at 58 after 30 years of service. His TSP is 60% G Fund ($468,000) and 40% C/S Fund index ($312,000). He has no traditional IRA. He wants retirement income and eventually to do Roth conversions starting at 60.

The wrong move: Roll the entire TSP to a traditional IRA immediately. He loses penalty-free G Fund withdrawal access (he separated at 58, so Rule of 55 applies — he can take from TSP penalty-free right now). He gives up the guaranteed 4.5% return on $468,000 in exchange for a money market that pays less with no government guarantee.

Better approach: Keep $200,000 in the TSP (mostly G Fund) for penalty-free distributions through age 59½ — about 18 months of income at $130K/year. Roll the $580,000 index equity portion to a traditional IRA at Fidelity or Vanguard, where he can start planning Roth conversions for 2026–2032. Once he passes 59½, he can roll the remaining TSP G Fund allocation to the IRA or keep drawing it as needed.

Scenario B: Federal employee, age 44, leaving for private sector with $310,000 in TSP — wants Backdoor Roth

Jennifer is leaving a federal job for a tech company that offers a 401(k). She has no traditional IRA, and she and her husband do Backdoor Roth IRA contributions ($7,500 each) every year. Her income exceeds Roth IRA direct contribution limits.

The risk: Rolling $310,000 traditional TSP to a traditional IRA would trigger a 97.6% pro-rata taxable fraction on any subsequent Backdoor Roth conversion. Her $7,500 non-deductible Roth conversion would become a $7,167 taxable event instead of tax-free.

Better approach: Roll the $310,000 TSP directly into her new employer's 401(k), which accepts incoming rollovers (she verified this before accepting the offer). Zero IRA contamination — Backdoor Roth remains fully tax-free. She loses G Fund access, but she's 44 with 20+ years to growth and doesn't need the capital preservation feature right now.

Scenario C: Federal retiree, age 64, $1.3M TSP with $400,000 in Roth TSP — pre-Social Security income gap

Patricia retired at 64 with significant TSP balances split between traditional ($900,000) and Roth ($400,000). Social Security begins at 70. She's in a six-year income gap where her marginal rate is low. She wants to maximize Roth conversions.

What she does: Rolls the entire traditional TSP ($900,000) to a traditional IRA over 2026. Her income from pension + investment income is about $45,000/year, leaving significant room in the 22% bracket ($94,300 in the 22% bracket for a single filer). She converts $80,000/year over six years — paying tax in the 22% bracket rather than the 32–37% bracket she'd face after Social Security, RMDs, and pension income converge after 73. She keeps the Roth TSP in the TSP (lifetime RMDs eliminated under SECURE 2.0) and lets it compound untouched.

After six conversions, she has approximately $480,000 in the Roth IRA plus compounded growth — a completely tax-free asset her heirs will inherit under the 10-year rule. The TSP rollover is simply the first step in a six-year conversion strategy that a specialist plans around her specific bracket, IRMAA exposure, and state tax situation.

When to stay vs. when to roll: a quick framework

1. TSP: G Fund — G Fund interest calculated monthly by U.S. Treasury; May 2026 annualized rate 4.500%; principal guaranteed by U.S. government.
2. TSP: Expenses and Fees (2026) — G Fund 0.034%; C Fund 0.035%; S Fund 0.051%; I Fund 0.048%.
3. IRS Topic 558: Additional Tax on Early Distributions — IRC § 72(t)(2)(A)(v) age-55 separation-from-service exception for employer plan distributions.
4. TSP Bulletin 15-4: Public Safety Employees' Exemption — IRC § 72(t)(10) age-50 exception for federal law enforcement, firefighters, and air traffic controllers.
5. TSP: SECURE 2.0 § 325 — Roth TSP lifetime RMD elimination — effective January 1, 2024, designated Roth accounts in employer plans (including TSP) are no longer subject to required minimum distributions during the participant's lifetime.
6. IRS: 2026 Retirement Plan Contribution Limits — TSP elective deferral $24,500; catch-up (50+) $8,000; super catch-up (ages 60–63) $11,250 per SECURE 2.0 § 109 (IRS Rev. Proc. 2025-67).

Values verified May 2026 against tsp.gov and IRS.gov sources.