2026 TSP Contribution Limits: The Per-Pay-Period Math

1. The four contribution limits that matter in 2026

The 2026 TSP contribution limits are a $1,000 bump from 2025. Here are the four numbers every federal employee needs to know:

The $35,750 limit for ages 60 to 63 is the most generous TSP contribution opportunity that has ever existed for federal employees. SECURE 2.0 Section 109 created this enhanced "super catch-up" specifically for the four years before traditional retirement age. At age 64, the limit drops back to the regular $32,500 catch-up. That’s not an error in the law — Congress wrote it that way.

For a GS-14 in the DC locality earning roughly $143,000, that $35,750 limit represents about 25% of gross salary going directly into tax-advantaged retirement savings. For a FERS participant receiving the full 5% agency match on top, total annual contributions to the TSP can exceed $42,900 per year during those four peak years.

2. Per-pay-period math by age group

The IRS sets annual limits but the TSP processes contributions per pay period. The federal pay calendar runs 26 pay periods in most years, including 2026.

To hit each limit cleanly without missing match, divide the annual limit by 26:

A subtle but important rule: the TSP cannot accept contributions that exceed the annual limit. If you set your contribution at $943 (which would total $24,518 over 26 periods), the TSP automatically reduces your final pay period’s contribution so you land exactly at $24,500. This is fine — you still get the full match. But if you want predictability, rounding down to $942 keeps things simple and contributes $24,492 for the year (just $8 under the limit).

The pay period start date matters. The first pay period in which you can make 2026 TSP contributions is Pay Period 25, which began December 14, 2025, with the first pay date in 2026 being January 8, 2026. To ensure your 2026 election takes effect from the first paycheck, your payroll change must be processed by the end of November 2025. If you missed that deadline, you can still update your election any time — but you’ll have fewer pay periods to spread the contribution across, meaning you’ll need a higher per-pay-period amount to reach the cap.

For example, if you start your max contribution in Pay Period 5 (mid-February 2026), you have only 22 pay periods left. To hit $24,500: $24,500 ÷ 22 = $1,114 per pay period instead of $942.

The 2026 TSP super catch-up of $35,750 is structurally the most generous retirement contribution opportunity ever offered to federal employees. It applies for exactly four years — ages 60 through 63 — and disappears at 64. That window is engineered for federal retirement runway, not for early retirement.

3. The agency match — how the 1% + 3% + 2% structure actually works

FERS and BRS (uniformed services Blended Retirement System) participants get up to 5% in agency contributions per pay period. The structure is the same as it has been since 1986, but it confuses federal employees every year:

A few specifics that get glossed over:

• The Agency Automatic 1% is yours regardless of whether you contribute anything. Even if you contribute $0, your agency adds 1% of basic pay to your Traditional TSP every pay period.
• The first 3% of your contribution gets dollar-for-dollar match. Contribute 3% of basic pay → agency adds another 3%.
• The next 2% gets 50-cent match. Contribute the 4th and 5th percent of basic pay → agency adds another 1% (50¢ per dollar).
• Above 5%, there’s no additional match. Contributing 10% or 20% of your pay doesn’t increase your agency contribution. You just save more of your own money.

All agency contributions go to your Traditional balance. This is true even if you elect Roth TSP for your own contributions. As of the 2026 in-plan conversion launch (January 28, 2026), you can convert that Traditional match balance to Roth — but you’ll owe income tax on the converted amount.

CSRS employees receive no match. Civil Service Retirement System employees can contribute to TSP, but agency match doesn’t apply. The CSRS pension is structured to replace a higher percentage of income, so the TSP is supplemental rather than primary.

Vesting matters. Your own contributions and the matching contributions are immediately vested. The 1% Agency Automatic contribution has a vesting requirement — 3 years for most FERS employees, 2 years for Congressional and certain non-career positions. If you separate before vesting, you forfeit the 1% (but keep all the matching dollars and your own contributions).

For more on how the match interacts with your fund allocation choices, see TSP Funds Explained: A 2026 Complete Guide. And for the career-side decisions that determine your basic pay — which determines your match — Federal Warrior covers Federal Warrior’s career and pay coverage ↗.

4. The front-load trap that costs FERS employees thousands

This is the most expensive mistake high-earning federal employees make every year, and it happens because the agency match is calculated per pay period, not annually.

Here’s how the trap works. A GS-15 earning $200,000 contributes 20% of basic pay each pay period — $1,538 per pay period. That sounds aggressive but sustainable. Except it isn’t: $1,538 × 16 pay periods = $24,608, which exceeds the $24,500 limit. The TSP stops accepting contributions at pay period 16 (early August).

For pay periods 17 through 26 — the remaining 10 pay periods of the year — the employee is contributing $0. And agency match is calculated as 5% of $0. That’s a 5% match the employee permanently loses on roughly $77,000 of basic pay paid out from August through December.

The math: 10 pay periods × ($200,000 ÷ 26) × 4% match = roughly $3,077 in agency match left on the table. That’s nearly $3,100 of free money the employee voluntarily walked away from by front-loading.

The fix: Set your contribution as a dollar amount per pay period that lands at $24,500 exactly at the end of Pay Period 26. For 2026: $942 per pay period (or $943 if you’re comfortable with the TSP auto-adjusting your final pay period). Both approaches preserve the match for all 26 pay periods.

The chart shows why this matters more as income rises. A $100K earner contributing 30% per pay period loses about $600 in match — annoying but not catastrophic. A $300K SES-level earner contributing 15% can lose over $5,000 every year. The dollar exposure scales with salary, but the percentage of total compensation lost is roughly 1-2% of base pay walking out the door annually.

The percentage-based alternative. If you prefer to use a percentage of pay rather than a dollar amount, the math depends on your salary. A federal employee earning $87,500 hits the $24,500 limit at exactly 28% contribution over 26 pay periods. Below that salary, even 100% contribution wouldn’t max out the limit. Above that salary, you need to reduce the percentage to stay under.

For ages 50+ and the catch-up windows, the same logic applies but with higher per-pay-period targets:

• Ages 50-59 / 64+: $1,250 per pay period to hit $32,500
• Ages 60-63: $1,375 per pay period to hit $35,750

A federal employee at any age who wants the maximum benefit needs to spread contributions evenly across all 26 pay periods. Front-loading anyone is mostly a bad idea — the only common exceptions are federal employees retiring mid-year (who should max out before separation since you can’t contribute after leaving) and uniformed services members deploying to combat zones with tax-exempt pay considerations.

5. The 2026 SECURE 2.0 change for high earners

One major rule change took effect January 1, 2026 that affects how — but not how much — high-earning federal employees contribute. Under SECURE 2.0 Section 603, federal employees age 50 or older who earned more than $150,000 in 2025 FICA wages (Box 5 of your W-2) from their federal employer must direct all 2026 catch-up contributions to Roth TSP, not Traditional.

The rule applies only to catch-up contributions ($8,000 regular or $11,250 super catch-up). Regular contributions up to the $24,500 limit can still be Traditional, Roth, or split however the employee chooses.

The wage threshold uses prior-year FICA wages, which means:

• For 2026 contributions: based on 2025 W-2 Box 5
• For 2027 contributions: will be based on 2026 W-2 Box 5
• The statute originally specified $145,000 indexed for inflation; the IRS adjusted it to $150,000 for 2026

Payroll handles this automatically. DFAS, NFC, the Interior Business Center, and other federal payroll providers identify affected employees from their prior-year W-2 data and automatically route catch-up contributions to Roth once the $24,500 pre-tax limit is reached. The change is seamless from the employee’s perspective — but your take-home pay will reflect it, because Roth contributions are made with after-tax dollars instead of reducing current-year taxable income.

For a deeper dive on what this rule means strategically and how it interacts with the Roth vs Traditional decision, see Roth vs Traditional TSP in 2026.

6. The spillover mechanism — what it does and what it doesn’t do

Since 2020, the TSP has used a spillover mechanism to simplify catch-up contributions. Before 2020, age-50+ employees had to make two separate elections — one for regular contributions and one for catch-up. The spillover replaced that with a single election.

How spillover actually works:

1. You make one contribution election (e.g., $1,250 per pay period if you’re age 50+).
2. Contributions go to the regular elective deferral bucket until you hit $24,500.
3. After hitting $24,500, additional contributions automatically spill over to the catch-up bucket (up to your applicable catch-up limit).
4. Once both limits are exhausted, contributions stop.

This eliminates the old administrative headache of tracking two separate contribution streams.

What spillover does NOT do:

• It does not protect you from the front-load trap. If your per-pay-period contribution is too high and you exhaust both regular AND catch-up limits before pay period 26, you still lose match for the remaining pay periods.
• It does not give you the catch-up automatically just because you’re 50+. You still need to elect a contribution amount above the regular limit pace.
• It does not extend matching to catch-up contributions automatically. Per TSP rules, catch-up contributions are matched only on the first 5% of your basic pay per pay period — same as regular contributions.

7. Three scenarios: GS-9, GS-13, GS-15

Concrete numbers for federal employees at three salary tiers. All assume 2026 base salary at Step 5 in the DC locality, full FERS coverage, and the goal of maximizing match without front-loading.

A few patterns to notice:

Agency contribution doesn’t change once you contribute 5%. A GS-13 contributing $24,500 ($942/PP) gets the same $6,900 agency contribution as a hypothetical GS-13 contributing only $6,900 (5% of pay). The additional $17,600 is purely employee savings — but it’s still highly valuable because it’s growing tax-advantaged.

The GS-15 at 62 in the super-catch-up window is in an extraordinary position. The combined $45,750 going into TSP each year — $35,750 from the employee plus $10,000 from the agency (1% automatic + 4% match) — exceeds what most private-sector employees can contribute to their 401(k) under any circumstance. Federal employees who haven’t been maxing out should consider doing so during these four peak years even if they couldn’t during earlier career stages.

At the GS-9 level, hitting the $24,500 limit requires contributing roughly 31% of basic pay — likely not practical for most early-career employees with student loans, rent, and life expenses. The realistic target is the 5% match threshold: $152 per pay period for the GS-9 in this example, capturing the full $3,950 agency contribution plus saving $3,950 of personal income. That’s $7,900 going into TSP every year — and compounded over 35 years at 7% return, that becomes roughly $1.1 million by age 70. See The TSP balance you should have at every age for what each career stage should aim for.