What the 2025 TSP Contribution Limits Actually Are
TSP has gotten complicated with all the conflicting information flying around. I’ve spent the last four years answering questions from servicemembers, and the number-one frustration I keep hearing is the same every single time: nobody explains the three separate limits that actually matter. Today, I will share it all with you.
So, without further ado, let’s dive in.
The elective deferral limit for 2025 is $23,500. This is what you personally contribute from your paycheck each year. The federal tax code calls it the 402(g) limit — most of us just call it the number we track in myPay every month. Active duty, Reserve, Guard — same number across the board.
Age 50 or older? You get an extra $7,500 in catch-up contributions. That puts your ceiling at $31,000 total. Most servicemembers in that age bracket qualify automatically.
Then there’s the Section 415(c) annual additions limit — $70,000. This one caps everything going into your TSP in a single calendar year. Your contributions, DoD matching, combat zone contributions, transfers — all of it combined. This is the ceiling nobody talks about. That’s a mistake.
For most people on regular active duty, $23,500 is your practical daily reality. But the $70,000 number starts mattering fast once deployment pay and matching enter the picture. I learned this the hard way after a deployment where I had no idea how much room I actually had left in my account. Don’t make my mistake.
How Combat Zone Contributions Change Everything
Probably should have opened with this section, honestly. The combat zone tax exclusion is the single rule that separates military TSP strategy from what every civilian federal employee deals with.
But what is the combat zone exclusion? In essence, it’s a designation that makes certain pay tax-exempt while you’re serving in an approved combat area. But it’s much more than that — it also unlocks a completely separate TSP contribution category that most servicemembers never use correctly.
When you’re in a designated combat zone receiving tax-exempt combat pay, that money doesn’t count against your $23,500 elective deferral limit. You can keep contributing from it after you’ve already maxed out regular contributions. Those dollars sit in their own tracked category. They do count toward the $70,000 annual additions cap, though — that part matters.
Here’s what that actually looks like. Say you’re an E-6 deployed to the Middle East. You’re pulling in roughly $4,200 monthly, with about $1,800 of that designated as tax-exempt combat pay. You hit your $23,500 elective deferral cap in October. Under normal circumstances, you’d stop contributing entirely and forfeit four months of matching. But you don’t have to stop. That $1,800 in combat pay can keep flowing into TSP through November, December, January, February — as long as you haven’t crossed $70,000 in total annual additions. Legal. Tax-advantaged. Most people just don’t know to do it.
The catch is real, though. This only works while you’re physically in the combat zone receiving the exclusion. Once you redeploy, you’re back under the standard $23,500 cap for any new contributions from regular taxable pay. Whatever combat zone money already landed in your account stays put — it just stops being a separate avenue for new contributions.
Log into your TSP account and you’ll see it clearly: separate line items for “Elective Deferrals” and “Combat Zone Contributions.” Tracked independently. Both feeding into that same $70,000 ceiling.
BRS Matching and How It Fits Inside the Limit
I’ve watched servicemembers panic and cut their own contributions because they were convinced DoD matching would push them past some limit. It won’t. But the way the limit architecture works needs a straight explanation.
Under BRS, the military matches up to 4% of your base pay. You don’t contribute it — the Department of Defense does, automatically. And here’s the critical piece: that match does not count against your $23,500 elective deferral limit. Max out your own contributions entirely and the match still flows in on top, untouched.
It does count toward the $70,000 annual additions limit — so run the actual math. Your $23,500 elective deferral plus a 4% DoD match lands somewhere around $2,400 for most E-5s and below, closer to $3,500 for mid-grade enlisted. Add those together. You’re still nowhere near $70,000. The room left is enormous.
The mistake I see repeatedly — and I mean repeatedly — is servicemembers going cold on contributions in November or December because they’re scared of triggering some penalty. They think cutting contributions protects them. It doesn’t. It just costs them matching dollars and tax-advantaged space they’ll never get back. Keep the contributions flowing. The match processes regardless. The only ceiling worth actually worrying about is $70,000, and you’d realistically need to be a senior officer with a sizable deployment bonus to brush up against it.
Want to capture every dollar of DoD matching? Set your contribution percentage to at least 4% of base pay. Anything under that and you’re leaving free money sitting on the table. Deployed with combat pay coming in? You’ve got even more room to work with — the previous section covers exactly how that plays out.
How to Pace Your Contributions So You Don’t Run Out Early
Frustrated by hitting your limit in October and watching two months of potential matching disappear? That’s a pacing problem, and there’s a straightforward fix.
Here’s what goes wrong. Most servicemembers pick a round number — say $2,000 a month — punch it into myPay, and forget about it. On a $4,000 monthly base, that gets you to $23,500 somewhere around late October. November and December sit completely idle. No contributions. No matching.
The fix requires about five minutes of math once a year. Take your target annual contribution — $23,500 standard, $31,000 if you’re 50 or older — and divide it by your actual number of pay periods. Most servicemembers get 26. $23,500 ÷ 26 = $904 per pay period. Not $2,000. Not $1,500. $904. You’ll hit your ceiling right around mid-December and won’t miss a single matching period.
One thing TSP won’t do for you: reset your contribution amount on January 1st. That’s on you. Log into myPay, update your figure manually, and do it in mid-December so it kicks in with your first January paycheck. Miss that step and you’ll open 2026 over-contributing — which triggers excess deferral penalties that are genuinely unpleasant to unwind.
Deployed servicemembers should recalculate entirely. If you know you’re heading into theater for six months of tax-exempt combat pay, front-load your regular elective deferrals early, shift volume into the combat pay contribution category during deployment, then dial back when you redeploy. It takes planning — but you’re capturing contribution space that doesn’t exist in any other context.
Catch-Up Contributions If You Are 50 or Older
The 2025 catch-up limit is $7,500, stacked on top of the standard $23,500. That’s $31,000 total for anyone who’s hit 50. Same allowance whether you’re active duty, Reserve, or Guard — no military-specific reduction applies.
SECURE 2.0 simplified how these work. Previously, catch-up contributions routed into a separate account structure that functioned more like an IRA. Now they flow directly into your main TSP balance as a single combined account. Simpler to track, cleaner on statements, better for most people approaching or already in retirement.
That’s what makes this change endearing to us older servicemembers — less administrative friction, same tax-advantaged benefit. You’ll find the catch-up field in myPay alongside your regular contribution settings. Set it separately, but it lands in the same place. The math is straightforward once you know where to look.
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