Table of Contents
- Contribute 5% of basic pay each pay period to receive the full BRS Service contribution of 1% automatic plus up to 4% matching.
- BRS matching and vesting of the Automatic 1% begin on the first day of your 25th month of service.
- The 2026 elective-deferral limit is $24,500, so pace high contributions through December to avoid losing later matching.
- Roth earnings generally require the five-year rule plus age 59½, permanent disability, or death to qualify for tax-free distribution.
- After separation, a TSP balance of at least $200 can remain in the plan without new military payroll contributions.
Your first TSP target is 5% of basic pay
If you are covered by the Blended Retirement System, contributing 4% instead of 5% leaves Service money unclaimed. The missed Service contribution equals half of 1% of basic pay. Repeat that shortfall through years of service, promotions, and investment growth, and the cost compounds.
BRS automatically applies to members whose Date of Initial Entry into Military Service is January 1, 2018, or later. Unless you change your election, 5% of basic pay goes to an age-appropriate Lifecycle Fund.
The Service contribution develops in stages under the DoD Blended Retirement System rules:
- The Service Automatic Contribution equals 1% of basic pay and begins after 60 days from your Pay Entry Base Date. You do not have to contribute to receive it.
- Service Matching Contributions begin on the first day of your 25th month of service.
- Your contributions and their earnings are immediately yours.
- Matching contributions are vested as soon as you receive them.
- The Automatic 1% and its earnings vest on the first day of your 25th month. Separate earlier and you forfeit that money.
The Service does not literally match 5%. It contributes 1% automatically, then matches up to another 4% based on your basic-pay contribution.
| Your basic-pay contribution | Automatic contribution | Service match | Total Service contribution |
|---|---|---|---|
| 1% | 1% | 1% | 2% |
| 2% | 1% | 2% | 3% |
| 3% | 1% | 3% | 4% |
| 4% | 1% | 3.5% | 4.5% |
| 5% or more | 1% | 4% | 5% |
At a 5% member contribution, 10% of basic pay enters TSP: 5% from you and 5% from the Service. Contributions from special, incentive, or bonus pay can increase your savings, but they do not produce more matching. Only basic pay—or inactive-duty pay for Reserve members—generates the match.
Matching generally continues through the pay period in which you complete 26 years of service.
Reaching $24,500 early can erase two months of matching
The 2026 elective-deferral limit is $24,500. If you reach it in October, payroll cannot make regular elective deferrals in November or December. You then receive no matching contribution for those pay periods because you made no member contribution. The Automatic 1% continues. There is no year-end match recovery.
If you expect to approach the limit, divide your planned annual contributions across every remaining pay period. Confirm future limits on the official TSP contribution limits page, because the dollar ceiling can change annually.
Guard and Reserve members face another catch. Military TSP contributions and elective deferrals to a civilian 401(k) or similar plan share the same individual annual limit. Your civilian employer and military payroll system will not necessarily coordinate the totals, so you must track the combined amount yourself.
Use a different contribution move at each career stage
Your contribution rate may need to change as your basic pay, taxable income, and expected withdrawal date change. Once BRS matching starts, keep the 5% floor unless losing current cash flow would force you into debt or leave you unable to pay immediate expenses.
| Career stage | Contribution move | Main catch |
|---|---|---|
| Accession through month 24 | Keep the default 5% if your budget permits and build emergency cash outside TSP. | Matching has not started, and the Automatic 1% is forfeited if you leave before vesting. |
| Month 25 through early career | Contribute at least 5% of basic pay every pay period. Increase the rate after promotions and raises. | A 4% contribution captures only a 3.5% match. |
| Midcareer | Protect the 5% floor through PCS moves, marriage, home purchases, and childcare changes. Consider bonus or special-pay contributions after preserving cash reserves. | Contributions from those extra pay categories are not matched. |
| Combat-zone deployment | Recalculate your rate using higher or tax-exempt cash flow. Check each LES for member, automatic, matching, and tax-exempt totals. | A large Roth election can fail if deductions leave too little net pay. |
| Late career or high contributor | Pace contributions through December and adjust investment risk to your withdrawal horizon. | Maxing out early stops later matching; separation alone is not a reason to abandon stocks. |
Use the Military Pay and PCS Workspace to test whether 5% still fits after a duty-station change. If you are enlisted, the 2026 enlisted pay chart can help you calculate the basic-pay amount behind your contribution percentage.
Do not treat TSP loans or withdrawals as routine emergency funding. Cash outside TSP gives you room to keep the 5% contribution running when a car repair, PCS expense, or family bill arrives.
Traditional versus Roth depends on your taxable income
Traditional and Roth describe tax treatment. They do not identify investments. You can hold the same TSP funds under either treatment.
| Feature | Traditional TSP | Roth TSP |
|---|---|---|
| Tax treatment now | Contributions generally reduce current federal taxable income. | Contributions are made after tax with no current deduction. |
| Treatment at withdrawal | Contributions and earnings are generally taxable. | Contributions come out tax-free; earnings are tax-free when distribution requirements are met. |
| Often fits when | Your current marginal tax rate is higher than the rate you expect in retirement. | Your current tax rate is lower than the rate you expect later. |
| Military-specific consideration | Can lower taxable income now. | BAH and BAS are already excluded from taxable income, which can make Roth attractive for junior members. |
A qualified Roth distribution generally requires satisfaction of the Roth five-year rule plus age 59½, permanent disability, or death. Do not assume every Roth withdrawal is automatically free of tax on earnings.
Service Automatic and Matching Contributions always enter your Traditional balance, even if every dollar you contribute goes to Roth. Choosing Roth does not cost you the BRS match. Your account will contain Roth member money and Traditional Service money.
Junior members may start with Roth because taxable income can be much lower than total military compensation. This is a starting point, not a rule. A member with spousal income, civilian income, or other taxable income may receive more current value from Traditional contributions. You can also split contributions between Traditional and Roth when you cannot determine which tax treatment will work better over time.
Beginning in January 2026, TSP permits Traditional-to-Roth in-plan conversions. The converted amount creates taxable income. Do not convert a large balance without estimating the federal and state tax consequences first.
Choose funds by withdrawal date, not separation date
The TSP offers five core funds plus Lifecycle Funds. The official TSP investment fund descriptions provide current objectives and risks.
| Fund | What it holds | The catch |
|---|---|---|
| G Fund | Special U.S. Treasury securities | It avoids market loss of principal, but inflation can erode purchasing power. |
| F Fund | Broad investment-grade government, corporate, and mortgage-backed bonds | Bond prices can fall when markets and interest rates change. |
| C Fund | Large U.S. companies represented by the S&P 500 | It can lose value during stock-market declines. |
| S Fund | Small- and mid-sized U.S. companies outside the C Fund | It complements the C Fund but is generally more volatile. |
| I Fund | Stocks of non-U.S. companies | It carries international market and currency risks. |
| Lifecycle Funds | A diversified mix of G, F, C, S, and I Funds | Adding separate funds changes the allocation the Lifecycle Fund was designed to maintain. |
A Lifecycle Fund is intended to serve as a complete portfolio. Select the fund closest to when you expect to begin withdrawing the money, not the year you expect to leave active duty. It is rebalanced daily, adjusts its target allocations quarterly, becomes more conservative over time, and transitions to L Income at its target date.
The G Fund protects principal against a market decline. It does not protect your purchasing power from inflation. Holding everything in G for decades exchanges visible market swings for the risk that your money buys less over time.
An investment election does not move your existing balance
TSP uses separate controls for future deposits and money already in your account:
- An investment election controls where future member contributions, Service contributions, and incoming rollovers are invested. It does not move your existing balance.
- A reallocation changes the allocation of the money already in your account.
- A fund transfer moves money out of selected funds.
Investment-election changes ordinarily take effect the next business day. A reallocation submitted before noon Eastern is generally processed that business day. Traditional, Roth, and tax-exempt sources move proportionally during reallocations; you cannot isolate combat-zone basis in one selected fund.
Check both settings after changing your investment plan. Changing where the next contribution goes will not repair an existing allocation that no longer matches your intended withdrawal timeline.
Combat-zone pay changes the tax treatment of contributions
Combat Zone Tax Exclusion pay changes how Traditional and Roth contributions work.
A Traditional contribution from tax-exempt combat pay enters TSP as tax-exempt principal, sometimes called tax-free basis. That principal remains tax-free when withdrawn. Earnings attributable to it are taxable at withdrawal.
Traditional contributions from tax-exempt combat pay are not subject to the normal Internal Revenue Code §402(g) elective-deferral ceiling, although they remain subject to the larger §415(c) annual-additions limit. Check the current limits before trying to exceed the ordinary elective-deferral ceiling.
Roth combat-zone contributions receive different treatment:
- The combat pay is not taxed before contribution.
- Roth principal comes out tax-free.
- Earnings can come out tax-free when qualified-distribution requirements are met.
- The contribution still counts against the §402(g) elective-deferral limit.
If you reach the §402(g) limit while deployed, changing later combat-pay contributions to Traditional may let you continue contributing toward the §415(c) limit. You still need to preserve at least 5% of basic-pay contributions across the year if you want every available matching contribution.
Payroll execution can stop an otherwise valid contribution election. Roth elections are calculated against gross eligible pay but deducted from net pay. If taxes, allotments, debt collections, insurance, or other mandatory deductions leave insufficient net pay, the entire Roth contribution can fail.
You must elect at least 1% of basic pay before contributing from special, incentive, or bonus pay. When changing elections, review every pay-category field. An omitted category can be recorded as 0%.
Check your LES after each change. Verify the member contribution, Automatic 1%, matching contribution, and year-to-date tax-exempt or Roth totals. Contact your installation finance office if the Service contribution is missing.
Separation does not create a withdrawal deadline
You keep all member contributions and earnings when you separate. You also keep all matching contributions received. You keep the Automatic 1% and its earnings only if you reached the first day of your 25th month and became vested.
After separation, you have three main choices:
- Leave the money in TSP. If the balance is at least $200, the account can remain open. Existing money stays invested and can be reallocated, but military payroll contributions stop.
- Transfer or roll it over. You may be able to move eligible money to an IRA, civilian employer plan, or federal civilian TSP account.
- Take a cash distribution. This can create current income tax, a possible early-distribution penalty, and permanent loss of future tax-advantaged growth.
Review the official TSP separation choices before authorizing a rollover or withdrawal. Separation itself does not require you to withdraw the account or move everything to the G Fund. Your expected withdrawal date and ability to tolerate losses should control the allocation.
TSP must receive correct separation information from your service before some withdrawal requests can be processed. If your account still shows you as serving, contact your service finance channel and request correction. Submitting the same withdrawal repeatedly will not correct your service record.
Start transition planning before terminal leave. Use the military TAP class guide to track deadlines, then build your civilian materials through the Military Transition Resume Center and organize job activity in the application tracker. A delayed first civilian paycheck is easier to handle when you have cash outside TSP and do not need an early distribution.
Check these five items on your next LES
- Confirm that your basic-pay contribution is at least 5% if BRS matching has started.
- Verify the Automatic 1% and matching contribution appear separately.
- Estimate whether your 2026 contributions will reach $24,500 before December.
- Confirm Roth, Traditional, and special-pay percentages match the election you intended.
- Log in to TSP and verify both your future investment election and existing account allocation.
Questions people actually ask
How much should I contribute to TSP to get the full military match?
Under BRS, contribute at least 5% of basic pay each pay period after matching begins. The Service contributes 1% automatically and matches another 4%, producing a total Service contribution of 5%. Contributing 4% receives only a 3.5% match. Special, incentive, and bonus-pay contributions increase savings but do not generate additional matching.
When does the BRS TSP match start?
Service Matching Contributions begin on the first day of your 25th month of service, measured from your Pay Entry Base Date. The Automatic 1% begins after 60 days. Your matching contributions are vested when received, while the Automatic 1% and its earnings vest on the first day of month 25.
Is Roth or Traditional TSP better for active-duty military?
Roth often deserves first consideration when your taxable income is low because BAH and BAS are already excluded from taxable income. Traditional may be stronger when your current marginal tax rate is high and the immediate deduction has value. Service Automatic and Matching Contributions always enter the Traditional balance, even when your own contributions are Roth.
Can I lose BRS matching by maxing out TSP early?
Yes. The 2026 elective-deferral limit is $24,500. If you reach it before the final pay periods of the year, regular member contributions stop, and so does the related match. The Automatic 1% continues, but missed matching is not recovered later. Pace contributions through December and coordinate civilian retirement contributions if you serve in the Guard or Reserve.
What happens to my TSP when I leave the military?
You can leave at least $200 in TSP, transfer eligible money to an IRA or employer plan, or request a distribution. You keep your contributions, earnings, and matching contributions. You keep the Automatic 1% only if vested. Separation does not require withdrawal, and cashing out can trigger taxes, a possible penalty, and lost retirement growth.