The TSP: the best retirement account most people ignore

The Thrift Savings Plan is the federal government's version of a 401(k), and by the numbers it's one of the best retirement accounts in existence. Expense ratios run around 0.05% or less — a fraction of what typical civilian 401(k) funds charge — and under the Blended Retirement System, the government matches up to 5% of your base pay. Despite that, a huge share of junior service members contribute little or nothing.

Why the TSP is genuinely elite

• Rock-bottom fees: roughly $5 a year per $10,000 invested (2025 estimate) versus $50–$100+ in many civilian plans.
• A 5% government match under BRS — an instant, guaranteed 100% return on the first chunk of your savings.
• Both Traditional (pre-tax) and Roth options in the same account.
• High contribution room: the elective deferral limit is roughly $24,500 for 2026 (estimate), far above IRA limits.
• Simple, sensible fund menu — hard to blow yourself up with exotic choices.

The match: free money with one catch

Under BRS you get an automatic 1% of base pay from the government even if you contribute nothing, plus a match on the next 4% you contribute. Contribute 5% and the government adds 5%. The catch: the automatic 1% and the match require two years of service to fully vest, and legacy-system members get no match at all. There is no match on the parts of your pay that aren't base pay (BAH and BAS don't count).

Roth TSP vs Traditional TSP

For most junior enlisted members, Roth TSP wins. Your tax rate is unusually low right now — a big slice of your compensation (BAH/BAS) is already tax-free, which pushes your taxable income into the 10–12% brackets. Paying those low rates today and withdrawing tax-free in retirement is usually better than deferring. Senior officers and dual-income households in higher brackets have a stronger case for Traditional.

How to set it up this week

1. Log into myPay and set your TSP contribution to at least 5% of base pay.
2. Choose Roth or Traditional (or split — you can do both).
3. Log into tsp.gov and check which fund your money is actually landing in — don't assume.
4. Set a calendar reminder to bump your percentage by 1% every promotion or annual raise.
5. Name a beneficiary on the account. It takes two minutes and overrides your will.

What different contribution rates actually build

The difference between contribution rates feels small on a paycheck and enormous at the end of a career. Take an E-5 earning roughly $3,900 a month in base pay (2025–2026 estimate) and assume 3% annual pay growth and a 7% average return over a 20-year career. The bars below show approximate ending balances, including the government's automatic 1% and match where earned. Notice the jump from 0% to 5% — that's the match doing half the work — and how each step above 5% is pure acceleration on top of it.

The mistakes that quietly cost six figures

Three errors show up over and over in TSP balances. First, waiting: a member who starts 5% at year one versus year six ends a 20-year career with roughly $60,000–$80,000 more, because the earliest dollars compound the longest. Second, front-loading past the match: if you hit the annual elective deferral limit before December, your contributions stop — and under BRS, so does the match for the remaining pay periods. Members expecting a maxed year should spread contributions across all 12 months to capture every matching dollar. Third, cashing out at separation: a $40,000 TSP withdrawal at 28 loses roughly a third to taxes and the 10% early-withdrawal penalty, and the remaining balance would plausibly have grown past $300,000 by age 60 if left alone.

The fix for all three is the same: automate early, check the match math once a year, and treat the account as untouchable until retirement. The TSP will happily follow whatever instructions you gave it years ago — which is a superpower when the instructions are right and a slow leak when they're wrong.

One final habit closes the loop: pair every promotion with a one-percent bump. An E-4 who starts at 5% and adds a point at each promotion and each annual raise reaches a 12–15% contribution rate by E-6 without ever feeling a lifestyle cut, because each increase came out of money the household had never spent. That path plausibly retires from a 20-year career with $350,000–$450,000 in the TSP (2025–2026 estimates) — versus roughly $200,000 for the flat 5% saver — and every dollar of the difference was invisible on the way in.

The bottom line

Contribute at least 5% to capture the full match, lean Roth while your tax rate is low, make sure your money isn't idling in the G Fund, and raise your contribution with every pay bump. The TSP's fees and match make it the first dollar of investing every service member should do — before any brokerage app, crypto, or 'opportunity' someone in the barracks is pitching.