TSP 72(t) SEPP: Penalty-Free Withdrawals Before Age 59½

The Rule of 55 is the most widely discussed way to access TSP without penalty — but it only works if you separate from federal service in the calendar year you turn 55 or later (age 50 for law enforcement, firefighters, and air traffic controllers). If you leave federal service at 48, 51, or 53, Rule of 55 doesn't apply. Your TSP is locked until 59½ unless you qualify for a different exception.

That exception is Section 72(t) Substantially Equal Periodic Payments (SEPP) — an IRS-approved method to take regular distributions from a retirement account before age 59½ without paying the 10% early withdrawal penalty. It applies to IRAs and qualified retirement plans including TSP. The trade-off is commitment: once started, you cannot change or stop the payments without triggering retroactive penalties on all prior distributions.

Rule of 55 vs. 72(t) SEPP: Which Applies to You?

72(t) SEPP Calculator

Enter your age, account balance, and interest rate. The calculator shows your annual distribution under both the Fixed Amortization method (higher, level payment) and the RMD method (lower, recalculated annually). Both are IRS-approved safe harbors per IRS Notice 2022-6.

The Three IRS-Approved Methods

IRS Notice 2022-6 defines three safe-harbor methods for calculating SEPP. All three are based on your account balance at inception, your age, and an applicable interest rate.

1. Required Minimum Distribution (RMD) Method

Annual distribution = Account balance ÷ Life expectancy factor from the IRS Single Life Expectancy Table.¹ The factor declines by approximately 1 each year, so your payment changes annually. This method produces the lowest distributions of the three — often significantly lower than the amortization method — but it is the most flexible because payments naturally adjust as your balance changes.

2026 example: A 50-year-old with $600,000 using the RMD method: $600,000 ÷ 36.2 = $16,575/year.

2. Fixed Amortization Method

Annual distribution is calculated like a fixed mortgage payment: using the account balance at inception, your life expectancy factor, and an interest rate up to the maximum allowed. The payment is the same every year for the life of the SEPP — it does not change as the account balance changes. This method typically produces the highest distributions.

Formula: Annual payment = Balance × rate ÷ (1 − (1 + rate)^(−n)), where n = life expectancy factor.

2026 example: Same 50-year-old with $600,000 at 5.0%: Annual payment = $600,000 × 0.05 ÷ (1 − 1.05^(−36.2)) = $34,500/year. More than double the RMD method.

3. Fixed Annuitization Method

Uses an annuity factor derived from the mortality table in Rev. Proc. 2002-62 and the same maximum interest rate. Results are typically close to the fixed amortization method. The annuitization method is less commonly used in practice because the amortization method is simpler to document and produces similar or identical results for most ages.

Maximum interest rate in 2026

The maximum rate is the greater of 5% or 120% of the federal mid-term AFR for either of the two months before SEPP begins.² For June 2026: 120% of the mid-term AFR is approximately 4.96%, which is less than 5%, so the effective ceiling is 5.00%. Using the full 5.00% maximizes the fixed amortization payment — which is what most retirees want when they need income. // Source: IRS Rev. Rul. 2026-11 (June 2026 AFR tables)

The Lock-In Period and the Modification Trap

This is where most 72(t) mistakes happen. Once you begin SEPP, IRC § 72(t)(4) requires that the exact payment schedule continue for the longer of 5 years or until you reach age 59½.³

The modification penalty is severe

If you modify a SEPP — change the annual amount, roll the account to a new IRA mid-stream, take an extra distribution, or stop payments — the IRS treats it as a retroactive violation of the entire plan. All prior distributions are assessed the 10% penalty plus interest from each distribution date.³ On a $34,000/year plan running 9 years, that penalty exposure can easily exceed $30,000–40,000.

What counts as a modification:

• Taking a distribution in a different amount than scheduled
• Rolling the SEPP account into a different IRA (creating a new plan)
• Taking a hardship withdrawal or TSP loan from the same account
• Adding new contributions to the SEPP account (resets the balance — can affect calculated payment)

The one permitted switch

IRS Notice 2022-6 allows a one-time, irrevocable switch from the fixed amortization or fixed annuitization method to the RMD method — without triggering the modification penalty.¹ This is useful if interest rates fall significantly or your balance drops and the fixed payment becomes unsustainable relative to what the account can support.

TSP vs. IRA: Which Account to Use for SEPP

TSP is technically eligible for 72(t) SEPP as a qualified plan under § 401(a). However, there are practical differences that lead many separated federal employees to roll TSP to an IRA before beginning SEPP.

Option A: SEPP directly from TSP

TSP offers a life expectancy installment option for separated employees, which distributes based on your IRS Single Life Expectancy factor and account balance — essentially implementing the RMD method. This satisfies 72(t) requirements. However:

• TSP processes life expectancy installments annually, with no intra-year adjustments
• TSP does not support the fixed amortization method directly — you'd need to calculate the correct amount and request a specific installment, which can be cumbersome to coordinate exactly
• TSP has no mechanism for you to document your SEPP elections at inception in a way that mirrors what IRA custodians provide

Option B: Roll TSP to IRA, then begin SEPP

The more common approach for the fixed amortization method. You roll TSP to a traditional IRA, compute and document your SEPP at inception, then set up automatic annual distributions. Benefits:

• IRA custodians (Fidelity, Schwab, Vanguard) have established 72(t) SEPP procedures and can generate distribution documents
• You retain full control over investment choices within the IRA
• You can use the fixed amortization method at the maximum rate (5% in 2026) for higher income

Note: Rolling TSP to IRA means you lose the G Fund, the Rule of 55 exception (if not already past 55), and TSP's ultra-low 0.035% expense ratios. See TSP Stay vs. Rollover for the full tradeoff analysis.

The partial rollover / segmentation strategy

You don't have to SEPP your entire TSP balance. A common planning strategy:

1. Calculate how much annual income you need from the SEPP account
2. Use the fixed amortization formula to determine what balance produces that income
3. Roll only that amount from TSP to a separate, dedicated SEPP IRA
4. Leave the remainder in TSP (or roll to a second IRA) as untouched reserves

This limits the SEPP lock-in to a portion of your portfolio. The reserves can be accessed after 59½ without ever having been subjected to SEPP restrictions.

Example: A 50-year-old with $900,000 in TSP needs $30,000/year in SEPP income. At 5% amortization, a $520,000 balance generates approximately $30,000/year. She rolls $520,000 to a SEPP IRA and leaves $380,000 in TSP, which remains untouched until 59½.

Tax Treatment

72(t) SEPP distributions are regular income — taxed at ordinary federal rates in the year received. The penalty exemption eliminates only the 10% early distribution surtax; it does not create any preferential tax rate. Traditional TSP and traditional IRA distributions are 100% taxable. Roth TSP / Roth IRA distributions under SEPP are subject to the usual 5-year and age rules.

Planning considerations:

• IRMAA: SEPP income counts in the 2-year Medicare lookback window. If you expect to enroll in Medicare at 65, SEPP income at 63–64 can trigger IRMAA surcharges 2 years later. Plan the SEPP amount with this in mind.
• FERS supplement earnings test: If you're receiving the FERS Special Retirement Supplement, that income is subject to an earnings test ($24,480 in 2026).⁴ SEPP distributions are investment income, not earned income — they do not count against the earnings test.
• Roth conversion opportunity: The years between separation and age 59½ often represent a "low-income window" before Social Security and FERS supplement end. If you have non-SEPP TSP balance, Roth conversions from the non-SEPP portion can be a valuable strategy alongside a SEPP plan from the segmented IRA.

5 Common 72(t) Mistakes Federal Employees Make

1. Underestimating the lock-in before starting. A 50-year-old starting SEPP is locked in for 9.5 years. Many people don't model what happens if a financial emergency arises in year 4 — they'd face a large retroactive penalty to access extra funds. Have substantial emergency reserves outside the SEPP account before starting.
2. Including the entire TSP balance. Doing SEPP on your full $1.2M TSP when you only need $35,000/year creates unnecessarily high distributions and excess taxes. Use the segmentation strategy to size the SEPP account to your actual income need.
3. Not documenting the plan at inception. The IRS can question 72(t) SEPP years later. Document your calculation at inception: account balance, age, life expectancy factor, interest rate used, method chosen, first distribution date. Keep this with your tax records for the duration.
4. Rolling the SEPP IRA to another account during the plan. An IRA-to-IRA rollover mid-SEPP modifies the plan. The new IRA is a different account — the SEPP "contract" is with the original account. Even a 60-day rollover (same money going back in) can constitute a modification if it temporarily alters the balance.
5. Ignoring the one-time switch to RMD. If you started with fixed amortization and your account balance has declined significantly, you may be draining the account faster than it can sustain. The one-time switch to the RMD method (which bases payments on current balance) can reduce distributions and extend the account life without triggering the modification penalty.