The Thrift Savings Plan is likely the single largest retirement asset you’ll build during your career. The military sets it up for you. Nobody teaches you how to use it.
This is a benefits awareness guide, not financial advice. Consult a qualified financial advisor for decisions about your specific situation.
Last updated May 1, 2026 — Reflects 2026 contribution limits and rates
The most expensive mistake in the military
If you’re under BRS and not contributing at least 5% of your base pay to the TSP, you are leaving free money on the table every single paycheck. The DoD matches up to 5% — that’s money deposited into your account that you never have to pay back, never have to earn, and it compounds for decades. An E-5 at 6 years who contributes 5% and gets the full match will accumulate roughly $3,000–4,000/year in matching alone. Over 20 years at 7% growth, that match money becomes six figures. And over 80% of service members will separate before reaching 20-year retirement — making TSP their only military retirement benefit.
Bottom line up front
The Thrift Savings Plan (TSP) is the federal version of a 401(k) and the cornerstone of military retirement planning, especially under the Blended Retirement System (BRS). If you joined on/after Jan 1, 2018 (or opted into BRS), the DoD contributes up to 5% match on top of your contributions — that's an immediate 100% return on the first 5% of your pay you save. There are five core funds (G, F, C, S, I) plus age-based Lifecycle (L) funds with expense ratios around 0.05% (among the lowest of any retirement plan). The 2026 contribution limit is $24,500 (under 50) plus a $7,500 catch-up for age 50+. Roth and Traditional contributions are both available; combat-zone tax-exempt pay can be contributed Traditional and grow tax-free permanently. Critical pacing rule: the match is calculated monthly — if you max out in July, you forfeit five months of match. Spread contributions to hit the limit in December. Vesting on the automatic 1% requires 2 years of service; the matching portion vests immediately. After separation, you can leave funds in TSP, roll into an IRA, roll into a civilian 401(k), or convert annually — each option has tradeoffs around expense ratios, investment options, and withdrawal flexibility.
How TSP Works for Military Members
The basics and the BRS match
TSP is the military’s version of a 401(k). You contribute a percentage of your base pay, choose how to invest it, and it grows tax-advantaged until retirement. It’s managed by the Federal Retirement Thrift Investment Board, with expense ratios around 0.05% — among the lowest of any retirement plan in the country.
BRS Matching (joined on/after Jan 1, 2018 or opted in)
Automatic 1%: DoD deposits 1% of your base pay into your TSP whether you contribute or not. Vests after 2 years of service. Matching up to 4%: DoD matches your contributions dollar-for-dollar on the first 3%, then 50 cents on the dollar for the next 2%. Total: you contribute 5%, DoD contributes 5% = 10% of your base pay going into TSP. Critical: The match is calculated monthly. If you max out early in the year, you get no match for the remaining months. Pace your contributions to hit $24,500 in December, not July.
Non-BRS / High-3 (joined before Jan 1, 2018, did not opt in)
No government matching. You can still contribute to TSP and benefit from the tax advantages and low fees, but there is no free money component. Your retirement income comes primarily from the pension (50% of highest 36 months of base pay at 20 years). TSP is a supplement, not a replacement.
Auto-enrollment
Service members enrolled on or after October 1, 2020 are auto-enrolled at 5% of base pay (previously 3%). Contributions go into the Traditional TSP and are invested in the age-appropriate L (Lifecycle) Fund by default. You can change your contribution percentage, Roth/Traditional split, and fund allocation at any time through myPay.
$24,500 Elective deferral limit Combined Roth + Traditional from your paycheck
$72,000 Annual additions limit Total including employer match, special pay, and combat zone contributions
$8,000 Catch-up (age 50+) Additional above the $24,500 limit
$11,250 Super catch-up (ages 60–63) Higher catch-up for those in this specific age window
Military-specific note: Unlike civilian employees who can contribute dollar amounts per paycheck, military members contribute as a percentage of base pay. Calculate your percentage to hit exactly $24,500 in December — not before. If you max out early, the match stops for the remaining months of the year.
SECURE 2.0 § 603 — Roth catch-up mandate (effective January 1, 2026): If your FICA wages (Medicare wages, Box 5 of your W-2) in the prior year exceeded $150,000, all of your age-50+ catch-up contributions in 2026 must go to Roth — not Traditional. This is automatic: once you hit the $24,500 elective deferral limit, payroll will route your catch-up to Roth TSP. Affects senior NCOs with large re-up bonuses and O-5+ officers most directly. There is no choice here; it's a statutory mandate. Source: TSP Bulletin 23-5; SECURE Act 2.0, Section 603.
Roth vs Traditional — In a Military Context
Why this decision is different for service members
This is the most important decision you’ll make about your TSP, and the military context changes the math significantly compared to civilian advice.
Traditional TSP
Contributions come from pre-tax pay — you don’t pay income tax on the money going in. Your taxable income is lower today. You pay taxes when you withdraw in retirement. Best if you expect to be in a lower tax bracket in retirement than you are now.
Roth TSP
Contributions come from after-tax pay — you pay income tax now, but withdrawals in retirement are completely tax-free, including all the growth. Best if you expect to be in a higher tax bracket in retirement, or if you want tax diversification.
Why Roth is often the better choice for military members
Junior enlisted are in the lowest tax brackets of their lives. An E-3 or E-4 with BAH and BAS (both tax-free) often has a federal taxable income under $25,000. Paying 10–12% tax now to lock in tax-free growth and withdrawals for decades is a powerful trade. As your career progresses, your income rises. In retirement, between pension, TSP withdrawals, and Social Security, your tax bracket will likely be higher than it is as an E-4.
Important: The BRS match always goes into your Traditional TSP, regardless of your election. You cannot change this. This means even if you contribute 100% Roth, you’ll still have a Traditional balance from the government match — giving you some built-in tax diversification.
Combat Zone — The Triple Tax Advantage
The single best wealth-building opportunity in the military
If you deploy to an eligible combat zone, your pay is exempt from federal income tax under the Combat Zone Tax Exclusion (26 U.S.C. § 112). When you combine this with the Roth TSP, something extraordinary happens:
The triple tax advantage:
1. Tax-free going in — combat zone pay is already tax-exempt
2. Tax-free growth — Roth TSP earnings grow tax-free
3. Tax-free coming out — qualified Roth withdrawals are completely tax-free
This is a unicorn in tax law. There is virtually no other legal way to invest money that is never taxed at any point in its lifecycle.
Combat zone contribution limits
In a combat zone, you can contribute up to the $72,000 annual additions limit (including employer contributions). However, Roth contributions are still capped at $24,500. Any amount above $24,500 must go into Traditional TSP. So the optimal strategy is: contribute $24,500 to Roth (triple tax-free), then put the rest into Traditional up to $72,000.
Don’t forget the match
Even in a combat zone, the same monthly match rule applies. If you max out contributions too early, the match stops. The annual additions limit ($72,000) applies to the entire calendar year, not just your deployment period. Plan your contribution percentage to pace evenly.
Sources: 26 U.S.C. § 112 (Combat Zone Tax Exclusion); IRS Publication 3 (Armed Forces Tax Guide); TSP.gov combat zone contributions.
Fund Selection — Where Your Money Goes
The G Fund trap and what to do instead
TSP offers five individual funds and a series of Lifecycle (L) funds that blend them automatically based on your target retirement date.
G Fund (Government Securities) — the default trap
The G Fund is the safest fund: it invests in short-term government securities and has never lost money in any period. But that safety comes at a steep cost. Its average annual return is roughly 2–4% — barely keeping pace with inflation. A 25-year-old E-3 who leaves all contributions in the G Fund for 30 years will accumulate dramatically less than one who invests in the C or S Fund. The difference can be hundreds of thousands of dollars.
The five funds
C Fund (Common Stock Index) — tracks the S&P 500. Large US companies. Historically ~10% avg annual return. This is the workhorse. S Fund (Small Cap Stock Index) — tracks small and mid-cap US stocks. Higher growth potential, more volatile. I Fund (International Stock Index) — tracks international developed-market stocks. Adds global diversification. F Fund (Fixed Income Index) — tracks US investment-grade bonds. Lower risk, lower return than stocks. G Fund (Government Securities) — US Treasury securities. Lowest risk, lowest return.
L Funds (Lifecycle)
L Funds automatically adjust your allocation from aggressive (more C/S/I) to conservative (more G/F) as you approach your target retirement date. If you don’t want to manage your own allocation, an L Fund matched to your expected retirement year is a reasonable hands-off approach. The default for auto-enrolled members is the age-appropriate L Fund.
General principle
The younger you are and the further you are from withdrawal, the more you can tolerate short-term volatility in exchange for long-term growth. A 22-year-old with 40+ years until retirement has time to ride out market downturns. A heavy C/S allocation is age-appropriate. As you approach retirement age, gradually shifting toward F and G reduces risk. This is not financial advice — your risk tolerance and goals are personal. But leaving everything in the G Fund at age 22 is almost always the wrong answer.
After Separation — Your TSP Stays
Withdrawal rules, rollovers, and the Rule of 55
When you leave the military, your TSP account doesn’t close. It stays in place, continues to grow, and you can still change your fund allocation. You have several options.
Leave it in TSP
Often the best option. TSP’s expense ratios (~0.05%) are lower than most civilian 401(k) plans and many IRAs. Your money continues to grow, you retain access to all fund options, and you can change allocations anytime at TSP.gov. You can also roll a civilian employer’s 401(k) into your TSP to take advantage of the low fees.
Roll to an IRA
You can roll your TSP into a Traditional or Roth IRA for potentially more investment options (individual stocks, ETFs, sector funds). Traditional TSP rolls to Traditional IRA; Roth TSP rolls to Roth IRA. Be aware: IRA expense ratios are often higher than TSP, and you lose the unique G Fund (guaranteed return with no market risk).
Withdrawal rules
Before age 59½: Generally subject to a 10% early withdrawal penalty plus income tax (Traditional) or penalty on earnings only (Roth, if not qualified). Exception — Rule of 55: If you separate from federal service (including military) during or after the calendar year you turn 55, you can withdraw from TSP penalty-free. This is earlier than the standard 59½ rule and is a significant advantage for military retirees.
TSP loans
While serving, you can borrow from your TSP (general purpose loan or residential loan). After separation, outstanding loans must be repaid in full or the balance becomes a taxable distribution plus the 10% penalty if under 59½. If you’re planning to separate, consider this carefully.
Never cash it out
Cashing out your TSP at separation is the single most destructive financial decision a separating service member can make. You’ll pay income tax on the full amount (Traditional) plus a 10% penalty if under 59½. A $50,000 TSP cashed out at separation could cost you $15,000+ in taxes and penalties — and that $50,000, left invested for 30 years at 7%, would have grown to over $380,000.
Not contributing 5% under BRS. You are giving back free money. Even if you have debt, the instant 100% return on the first 3% (dollar-for-dollar match) beats almost any interest rate you’re paying.
Maxing out too early. If your contributions hit $24,500 in July, you get zero match from August to December. Pace your percentage to reach the limit in the last pay period of the year.
Leaving everything in the G Fund. The G Fund is for capital preservation near retirement, not for a 22-year-old with decades of growth ahead. Check your allocation at TSP.gov.
Contributing Traditional while deployed. Combat zone pay is already tax-free. Putting it into Traditional TSP means you’ll pay taxes when you withdraw. Switch to Roth before deployment to capture the triple tax advantage.
Cashing out at separation. That $30,000 today could be $230,000+ in 30 years. Leave it in TSP, roll it to an IRA, or roll it into a new employer’s 401(k) — but don’t cash it out.
This guide was built by Em, a retired U.S. Navy Commander (Medical Service Corps, 20+ years). Page 214 is free, privacy-first, and entirely client-side. The Thrift Savings Plan is authorized under 5 U.S.C. § 8432 (TSP authority and contribution rules), administered by the Federal Retirement Thrift Investment Board under 5 U.S.C. Chapter 84. Military participation rules follow 37 U.S.C. § 211 and the Uniformed Services Employment and Reemployment Rights Act (USERRA, 38 U.S.C. Chapter 43). The Blended Retirement System (BRS) was established by the National Defense Authorization Act for FY 2016 (Pub. L. 114-92), with full implementation effective Jan 1, 2018. Combat zone pay tax exclusion follows 26 U.S.C. § 112; Roth contributions of tax-exempt combat pay grow tax-free permanently per IRS rules. Annual contribution limits (elective deferral and catch-up) are set by the IRS under 26 U.S.C. § 402(g) and adjusted annually for inflation. Auto-enrollment at 5% effective Oct 1, 2020 was directed by Section 663 of the FY2020 NDAA. Current contribution limits, fund performance, and full plan documentation: tsp.gov. This is a guide, not financial advice — investment performance is not guaranteed, and past performance does not predict future results. Consult a qualified financial advisor or tax professional before making decisions specific to your situation.
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