Thrift Savings Plan for Air Force Members

The Thrift Savings Plan is the federal government’s retirement savings account, available to all military members. Under the Blended Retirement System, it’s not optional, the government contributes to your TSP whether you participate or not. But how much you contribute, which funds you choose, and whether you use Roth or Traditional determines how much you accumulate.

This guide explains the mechanics clearly so you can make informed decisions from your first paycheck.

How TSP Works Under BRS

The Air Force automatically enrolls BRS members in TSP with a default contribution of 3% of basic pay deducted from your pay each period. You can change this percentage at any time through MyPay.

The government’s contributions follow this schedule:

Contributing 5% of your basic pay activates the maximum government contribution of 5% total (the automatic 1% plus 4% in matching). Any amount you contribute above 5% still grows in your account, but the government match stops at 4%.

The 1% automatic contribution starts after 60 days of service and vests after 2 years. Matching contributions vest immediately. A member who separates before 2 years forfeits the unvested automatic contributions.

The Six TSP Fund Options

TSP offers six investment funds. Each has a different risk profile and historical return:

G Fund

The G Fund is unique. It earns interest at rates equal to long-term U.S. Treasury rates but with no risk of losing principal. It’s the only investment that essentially guarantees positive returns regardless of market conditions. The trade-off is lower long-term growth compared to stock funds.

C, S, and I Funds

These three are equity (stock) funds with higher expected long-term returns but short-term volatility. The C Fund tracks the S&P 500 and is the most commonly used equity fund. The S Fund adds exposure to smaller domestic companies. The I Fund adds international diversification.

Historically, the C Fund has averaged around 10% annual returns over multi-decade periods, though past performance doesn’t predict future results.

L Funds (Lifecycle Funds)

The L Funds automatically adjust your allocation based on a target retirement date. An L 2050 Fund holds mostly equities now and shifts toward bonds and the G Fund as 2050 approaches. L Funds are a reasonable default for members who don’t want to manage allocations manually.

Available L Fund options as of 2026:

An Airman who joins at 18 and serves 20 years retires at 38, not at 65. That matters when selecting an L Fund. The standard “pick the fund closest to your 65th birthday” guidance applies if you plan to leave the money in TSP and draw it down in later life. If you plan to take distributions at military retirement or roll the balance into an IRA shortly after separation, you may want a more conservative fund as your separation date approaches.

Each L Fund rebalances daily back to its target allocation. As the target date gets closer, the fund automatically reduces equity exposure and increases the share held in the G and F Funds. You don’t need to do anything, the shift happens automatically.

Early career members (20s-30s) generally benefit from equity-heavy allocations because they have decades for the market to recover from downturns. Members within 5-10 years of retirement often shift toward more conservative allocations. You can also build your own allocation by mixing the individual funds (G, F, C, S, I) in whatever ratio you want, and rebalance manually.

Roth TSP vs. Traditional TSP

Both Roth and Traditional TSP are available. The difference is when you pay taxes:

Junior enlisted members in lower tax brackets generally benefit from Roth TSP. Because your income is low now, you pay little tax on contributions. The money then grows and is withdrawn tax-free in retirement when you might otherwise be in a higher bracket.

Officers and senior NCOs in higher brackets may prefer Traditional to get the immediate tax deduction. The right answer depends on your current bracket versus your expected retirement bracket.

You can split contributions between Roth and Traditional TSP. Government matching contributions always go into the Traditional side, regardless of how you designate your own contributions.

Contribution Limits

TSP contribution limits are set by the IRS and apply to both military and civilian federal employees:

• Standard limit: $23,500 per year for 2026
• Catch-up contribution (age 50+): additional $7,500 per year
• Combat zone tax exclusion: members deployed to designated combat zones can contribute up to $70,000 per year (including government contributions)

The government match does not count against your personal contribution limit. You can contribute the full $23,500 yourself and still receive the 5% government match on top.

Most junior enlisted members won’t approach the annual limit on their income alone. But members who receive large bonuses, enlistment bonuses, SRBs, continuation pay, can contribute significant chunks immediately to reduce their tax bill and accelerate savings.

Loans and Withdrawals

TSP is a retirement account, so early withdrawals come with consequences.

TSP Loans

You can borrow from your TSP balance for:

• General purpose loans: up to $50,000 or 50% of vested balance (whichever is less), repaid over 1-5 years
• Residential loans: up to $50,000 for purchasing a primary residence, repaid over 1-15 years

There is a $50 fee to process a TSP loan. Loan interest rates are set monthly at the G Fund rate, which means you are essentially paying yourself interest, those payments go back into your account. You can only have one general purpose loan and one residential loan outstanding at the same time.

Loans are not taxed if repaid on schedule. The downside is opportunity cost: money you borrow stops growing in the market while it’s repaid. If you borrow $10,000 during a year the C Fund returns 10%, you’ve effectively lost $1,000 in growth on that borrowed amount, in addition to the administrative inconvenience.

If you separate from service before repaying a TSP loan, the outstanding balance is reported to the IRS as a taxable distribution. Traditional TSP loan balances treated as distributions are also subject to the 10% early withdrawal penalty if you are under age 59 1/2.

In-Service Withdrawals

While still serving, you can make hardship withdrawals under qualifying financial hardship circumstances, specifically: recurring negative monthly cash flow, medical expenses not covered by insurance, legal expenses from a separation or divorce, or imminent foreclosure or eviction. You must provide documentation. Hardship withdrawals are permanent; the money does not go back into your account.

Hardship withdrawals from a Traditional TSP account are taxed as ordinary income in the year you receive them. If you are under age 59 1/2, you also owe a 10% early withdrawal penalty on top of ordinary income tax, meaning a $5,000 hardship withdrawal at a 22% federal rate costs you roughly $1,600 in taxes and penalties before you see the money.

Roth TSP contributions (not earnings) can be withdrawn tax-free because you already paid tax on them. Roth earnings follow qualified distribution rules, generally tax-free only after age 59 1/2 and at least five years of Roth TSP participation.

Withdrawals After Separation

After separation or retirement, TSP offers flexible withdrawal options including lump sum, installment payments, life annuities, or a combination. You can also roll the balance into a civilian 401(k) or IRA. Required minimum distributions begin at age 73 per current IRS rules.

Members who retire from active duty at age 38-45 (the typical military retirement window) are still well below age 59 1/2. Withdrawals from a Traditional TSP in that window incur the 10% penalty unless you qualify for an exception. The most relevant exception for military retirees is the Rule of 55: if you separate from service in or after the year you turn 55, you can take penalty-free distributions from that employer’s plan. For most military retirees who serve 20 years and retire in their late 30s or early 40s, this exception does not apply. Rolling the balance into an IRA and using 72(t) substantially equal periodic payments is one strategy some early military retirees use to access funds penalty-free, but it requires careful planning and carries its own rules.

Practical Advice for New Airmen

When you arrive at your first duty station, visit finance and confirm your TSP contribution rate. The default 3% enrollment is a starting point, not a recommendation. Contributing at least 5% costs an E-4 about $165/month and activates the full government match.

If you can’t afford 5% early on, increase your contribution by 1% each year as your pay grows. Automated increases let you grow your savings without feeling a large step change in take-home pay.

For more on how TSP fits into your overall retirement strategy, see the retirement guide.

This site is not affiliated with the U.S. Air Force or any government agency. Verify all information with official Air Force sources before making enlistment or career decisions.