TSP contribution limits, Roth vs Traditional strategy, BRS matching, fund selection, and how to use combat zone deployments for a tax-free retirement advantage.
The IRS sets TSP contribution limits annually. For 2026, the limits are the same structure as 2025 with a modest adjustment. Here's what you can contribute:
| Contribution Type | Who Qualifies | 2026 Limit |
|---|---|---|
| Elective Deferral (Base) | All eligible service members | $23,500 |
| Catch-Up Contribution | Age 50–59 or 64+ | +$7,750 |
| SECURE 2.0 Enhanced Catch-Up | Age 60–63 only | +$11,250 |
| Overall Annual Addition (415c) | All (includes BRS match) | $70,000 |
| Combat Zone Special Limit | During tax-free combat deployment | Up to $70,000 |
To max out TSP at $23,500, you need to contribute about $1,958/month. At base pay of $5,000/month (roughly E-5 with 6+ years), that's 39% of base pay. Use MilWallet to find the right contribution rate for your pay grade without sacrificing essentials.
Your $23,500 elective limit covers your own Roth + Traditional contributions combined — not the government's BRS match. The government's automatic 1% and matching contributions (up to 4% more) come from a separate pot that counts toward the $70,000 overall limit only. This means the BRS match never reduces how much you can contribute.
During deployment to a designated combat zone, you can contribute up to 100% of your combat zone pay to TSP, potentially reaching the $70,000 overall cap — far above the standard $23,500 elective limit. Contributions above $23,500 from combat zone pay go into the Traditional (pre-tax) TSP automatically, not Roth. See the Deployment TSP Strategy section for full details.
Both Roth and Traditional TSP are available to all service members. The difference is when you pay taxes. Most active-duty members should lean toward Roth — but there are real exceptions.
| Factor | Roth TSP | Traditional TSP |
|---|---|---|
| Tax treatment now | Paid with after-tax dollars | Pre-tax (reduces taxable income now) |
| Tax treatment in retirement | Withdrawals 100% tax-free | Withdrawals taxed as ordinary income |
| Combat zone contributions | Tax-free in AND tax-free out — best option | Tax-free in, taxed on withdrawal |
| Required minimum distributions | None (if rolled to Roth IRA) | Yes, starting at age 73 |
| Best for | Lower tax bracket now; combat deployments | High tax bracket now; lower in retirement |
Traditional TSP is better if you're in a high tax bracket now and expect a significantly lower one in retirement. This typically applies to senior officers (O-5/O-6+) with significant outside income — a second earner, rental income, or investment distributions — pushing them into the 32%+ bracket.
Default to Roth TSP unless you're in the 32% bracket or above and plan to be in a materially lower bracket in retirement. Revisit this each time you get promoted to the next pay grade. Many O-5s benefit from switching to Traditional TSP at peak earning years.
If you entered service on or after January 1, 2018, or opted into BRS before 2019, you are under the Blended Retirement System. BRS includes a government TSP match — the equivalent of a 5% pay raise you only capture if you contribute.
Here's the match structure for a member earning $5,000/month in base pay:
At $5,000/month base pay, contributing just 5% ($250/month) captures the full $200/month government match — a 80% instant return on those dollars before any investment growth. That's $2,400/year in free money.
| Your Contribution | Government Match | Total Going In | Match Captured |
|---|---|---|---|
| 0% (none) | 1% auto only | 1% of base | ❌ Leaving free money |
| 3% of base | 1% + 3% | 7% of base | ⚠️ Partial match |
| 5% of base | 1% + 4% = 5% | 10% of base | ✅ Full match captured |
| 10%+ of base | 5% (match caps at 5%) | 15%+ of base | ✅ Full match + extra savings |
Always contribute at least 5% of base pay. Not contributing enough to capture the full match is the single biggest TSP mistake BRS members make. It's literally a pay cut you've chosen to take. The match vests after 2 years of service — even if you leave before that, you keep your contributions and earnings.
If you entered service before January 1, 2018, and did not opt into BRS, you are under the legacy "High-3" system. You receive no government TSP match, but your pension is more generous (2.5% × years of service × average high-3 pay vs. 2.0% under BRS). TSP contributions are still highly valuable under High-3 — they just don't have matching dollars behind them.
TSP offers five core index funds. Each tracks a different asset class. Understanding what you own matters — the difference between an all-G-Fund portfolio and an all-C-Fund portfolio over 20 years is the difference between a modest supplement and a life-changing sum.
| Years to Retirement | C Fund | S Fund | I Fund | G/F Funds |
|---|---|---|---|---|
| 30+ years (early career) | 60% | 20% | 20% | 0% |
| 20–30 years | 55% | 20% | 15% | 10% |
| 10–20 years | 50% | 15% | 10% | 25% |
| 5–10 years | 35% | 10% | 5% | 50% |
| At retirement | 20% | 5% | 5% | 70% |
Holding C and S Funds together roughly replicates a total U.S. stock market index fund. A common starting ratio is 80% C / 20% S, which approximates market-cap weighting. This gives broad U.S. equity exposure without needing to pick individual stocks or time the market.
L Funds (Lifecycle Funds) are professionally managed target-date funds that automatically adjust the mix of C, S, I, F, and G as your retirement approaches. Each fund has a target year. Pick the one closest to when you plan to withdraw.
The bar represents approximate stock exposure — higher is more aggressive. L Funds glide automatically from growth-oriented to preservation-oriented as the target year approaches.
L Funds are ideal if you want to set it and forget it. They are well-diversified, professionally managed, and eliminate the behavioral risk of panic-selling in a downturn. For most service members who don't want to actively manage allocations, an L Fund matching your expected retirement year is the right default choice.
Build your own if you want more control over the tilt — for example, higher S Fund exposure for more small-cap growth, or deliberately low I Fund allocation if you're skeptical of international exposure. Custom allocations require annual (or semi-annual) rebalancing discipline.
Your military pension is a bond-like asset — guaranteed income in retirement. This means your TSP can take more equity risk than a comparable civilian saver's portfolio. An all-stock TSP (C + S + I Funds) may be appropriate if your pension adequately covers base living expenses and your TSP is a growth vehicle on top of that.
Combat zone deployments create a rare, powerful TSP opportunity. When you serve in a designated combat zone, your base pay and most other pays become tax-free under the Combat Zone Tax Exclusion (CZTE). This creates a unique TSP window.
Normally, Roth contributions are made from after-tax dollars — you pay income tax, then put money in. During a combat zone deployment, your pay is already excluded from income tax. Roth contributions from that tax-free pay go in tax-free and come out tax-free in retirement.
An O-3 (CPT/1LT) contributing $1,000/month from combat zone pay into Roth TSP over a 9-month deployment saves approximately $2,200 in federal income tax (at 22% bracket) while building $9,000 in Roth TSP contributions that will grow and withdraw completely tax-free. No IRA or civilian 401(k) offers this.
This is the most commonly missed step. When you return from deployment, your expenses return to normal. If you don't adjust your TSP contribution back to a sustainable rate, you may overdraw your take-home pay. Set a calendar reminder to log into myPay and adjust your TSP percentage within the first week of your return CONUS date.
If your deployment ends in Q4 and you haven't hit the annual $23,500 limit, aggressively increase your TSP contribution for the remaining months of the year. The limit resets January 1 — unused contribution room cannot be carried forward. Many members lose $5,000–$10,000 in annual contribution space simply by not tracking where they are against the annual cap.
MilWallet provides TSP-specific tools alongside your full military pay breakdown — contribution rate calculator, Roth vs Traditional comparison, and BRS match optimizer.
Find your optimal contribution rate based on pay grade, BRS status, and deployment schedule
Calculate TSP →Your exact 2026 BAH rate by ZIP code and pay grade — to calculate how much you can afford to contribute
BAH Guide →Full pay tables for all enlisted and officer grades with YOS step increases
Pay Guide →