TSP Match Calculator

This calculator is designed to be straightforward. Start by entering your financial details into the "Salary & Contribution" section.

Enter your gross annual base pay in the "Annual Salary" field. Next, input the percentage of your salary you contribute to your TSP in the "Contribution Rate" field. Finally, select your "Service Type"—FERS for federal civilian employees or BRS for military personnel. While these are different systems, the matching formula used in this calculator is identical for both.

For a more detailed, long-term view, open the "Growth Projection" advanced settings. Here, you can add your "Current TSP Balance," the "Years to Retirement," and your "Expected Annual Return" on your investments. These optional inputs will generate a chart projecting how your TSP balance could grow with your contributions and the full government match. This can help you visualize the long-term impact of maximizing your match, which is a key part of any retirement plan.

Annual Salary

This is your gross annual base pay before any deductions. The TSP matching formula is based on a percentage of your basic pay, so it's the most important number for determining the dollar amount of both your contributions and the government's match. Do not include bonuses, overtime, or special pay, as these are typically not included in the matching calculation.

Contribution Rate

This is the percentage of your bi-weekly base pay that you elect to contribute to your TSP account. You can contribute any whole percentage up to the annual IRS limit. This rate directly determines how much matching money you receive from the government. As you'll see in the results, a rate of at least 5% is required to receive the maximum match. See how this compares to private-sector plans with our 401(k) contribution calculator.

Service Type

This field lets you specify whether you are a federal civilian employee under FERS or a military service member under BRS. For the purposes of calculating the matching contribution, the formula is the same: an automatic 1% contribution plus up to 4% in additional matching.

Expected Annual Return

This advanced input is your estimated average annual investment return for your TSP funds. This is used only for the optional growth projection. A common long-term estimate for a diversified stock portfolio is between 6% and 8%, but you should choose a number that reflects your personal investment strategy and risk tolerance.

Years to Retirement

Enter the number of years you plan to continue working and contributing to your TSP. This, along with your expected return and current balance, helps project the future value of your account. A longer time horizon gives your contributions and the government match more time to compound. You can explore different timelines with our retirement age calculator.

Current TSP Balance

This is the total amount of money you currently have in your TSP account across all funds (G, F, C, S, I, and L funds). This value serves as the starting point for the long-term growth projection.

The calculator applies the official TSP matching rules for FERS and BRS participants to determine your total government contribution. The calculation is performed in three parts.

First, the government automatically contributes an amount equal to 1% of your base pay to your account. This is the Agency/Service Automatic Contribution, and you receive it even if you contribute nothing yourself (after meeting vesting requirements).

Second, the government matches your contributions dollar-for-dollar on the first 3% of your base pay that you contribute.

Third, the government matches your contributions at a rate of 50 cents on the dollar for the next 2% of your base pay that you contribute (i.e., the portion of your contribution from 3% to 5%).

The calculator sums these three components to find your total agency match. The maximum match is achieved when you contribute 5% of your salary. At that point, the government contributes a total of 5% (1% automatic + 4% matching), effectively doubling your savings rate for that portion of your salary.

The optional growth projection uses a year-by-year compound growth formula. For each year, it adds your annual contribution and the calculated total agency match to your existing balance, then applies the expected annual return to the new total.

The calculator uses the following formulas to determine the government match and total annual contribution.

Contribution & Match Formulas

Your Annual Contribution = Annual Salary x (Contribution Rate / 100)

Automatic 1% Contribution = Annual Salary x 0.01

Dollar-for-Dollar Match (First 3%) = Annual Salary x min(Contribution Rate / 100, 0.03)

Fifty-Cent Match (Next 2%) = Annual Salary x max(0, min((Contribution Rate / 100) - 0.03, 0.02)) x 0.5

Total Agency Match = Automatic 1% Contribution + Dollar-for-Dollar Match + Fifty-Cent Match

Total Annual TSP Savings = Your Annual Contribution + Total Agency Match

Growth Projection Formula (Annual)

The growth projection is calculated iteratively for each year until retirement.

Investment Growth = (Current Balance + Your Annual Contribution + Total Agency Match) x (Expected Annual Return / 100)

End-of-Year Balance = Current Balance + Your Annual Contribution + Total Agency Match + Investment Growth

The Thrift Savings Plan match is one of the most generous employer matches available. It is designed to encourage federal employees and military members to save for retirement. The key is to contribute at least 5% of your basic pay to receive the full benefit.

Let's break it down with an example. Assume an annual salary of $85,000.

As the table shows, contributing anything less than 5% means you are leaving free money on the table. Once you contribute 5%, your total savings rate jumps to 10% of your salary, a powerful accelerator for your retirement savings goals.

The TSP offers both a Traditional (pre-tax) and a Roth (after-tax) savings option. You can choose to contribute to either one or a combination of both.

• Traditional TSP: Contributions are made before taxes, which lowers your current taxable income. Withdrawals in retirement are taxed as ordinary income.
• Roth TSP: Contributions are made with after-tax dollars, so there's no immediate tax deduction. Qualified withdrawals in retirement are completely tax-free.

A critical rule to understand is that all agency matching contributions, including the automatic 1%, are always deposited into your Traditional TSP balance. This is true even if you direct 100% of your own contributions to the Roth TSP. This means that over time, every TSP participant who receives matching funds will have a Traditional balance, which will be subject to taxes and Required Minimum Distributions (RMDs) in retirement.

Choosing between Traditional and Roth depends on your current income and what you expect your tax situation to be in retirement. For a deeper comparison, see our guide on Roth vs. Traditional IRAs, as the core concepts are similar. You can also model the long-term effects using a Roth 401(k) calculator.

The TSP follows the same elective deferral limits set by the IRS for 401(k) and 403(b) plans.

For 2026, the maximum you can contribute from your own pay is $23,500.

If you are age 50 or older, you can also make "catch-up" contributions. The catch-up contribution limit for 2026 is an additional $7,500. This means individuals 50 and over can contribute a total of $31,000.

The government matching contributions do not count toward this limit. They are part of a separate, much higher overall limit ($70,000 in 2026) that includes employee, employer, and any after-tax contributions. Most federal employees will not approach this overall limit.

Match Capture Score: This gauge provides an at-a-glance summary of how effectively you are using the TSP match. A score of 99 indicates you are contributing at least 5% and capturing 100% of the available government match. A lower score shows you are leaving free money unclaimed.

Summary Cards: These four cards provide the key numbers from the calculation:

• Your Contribution: The total dollar amount you contribute annually based on your salary and rate.
• Agency Match: The total dollar amount the government contributes (automatic 1% plus matching funds).
• Total Annual: The combined sum of your contribution and the agency match, representing your total TSP savings for the year.
• Match Rate: This shows the agency match as a percentage of your contribution. At a 5% contribution rate, this will be 100%, representing a one-to-one return on your investment.

TSP Match by Contribution Rate Chart: This bar chart visualizes how both your contribution and the agency match increase as you raise your contribution rate from 0% to 10%. It clearly shows that the agency match stops increasing after you hit the 5% contribution mark.

TSP Growth Projection Chart: If you use the advanced settings, this area chart projects the growth of your TSP balance over your specified time horizon. It demonstrates the powerful long-term effect of compounding, especially when boosted by consistent government matching funds. Use our main retirement savings calculator for a more comprehensive projection.

If the calculator shows you're not getting the full match, here are the most effective steps to take:

1. Contribute at Least 5%: This is the single most important action. Set your contribution rate to 5% to ensure you capture every dollar of the government match. Think of it as an immediate 100% return on the first 5% you save.
2. Automate Your Increase: If you can't jump to 5% immediately, increase your contribution by 1% every six months or year until you get there. Most payroll systems allow for automatic increases.
3. Contribute More Than 5%: While the match maxes out at 5%, your goal should be to save as much as you can up to the IRS limit ($23,500 in 2026). Every extra dollar benefits from tax-deferred (or tax-free) growth.
4. Utilize Catch-Up Contributions: If you are age 50 or over, contribute up to the additional catch-up limit ($7,500 in 2026) to accelerate your savings as you approach retirement.
5. Review Your Fund Allocation: Ensure your TSP investments are aligned with your risk tolerance and time horizon. The low-cost, diversified C, S, and I stock funds or the lifecycle L Funds can provide long-term growth.

1. Contributing Less Than 5%: This is the most common and costly mistake. By contributing less than 5%, you are voluntarily turning down free money from your employer.
2. Not Enrolling at All: Some employees fail to enroll, assuming the 1% automatic contribution is sufficient. This misses out on the extra 4% matching funds, which can amount to hundreds of thousands of dollars over a career.
3. Misunderstanding Vesting: For FERS employees, you must have three years of federal civilian service to be vested in the agency matching contributions and their earnings. If you leave before then, you forfeit that money. The 1% automatic contribution has a separate, shorter vesting period.
4. Confusing Basic Pay with Total Pay: The match is calculated on your basic pay. It does not include overtime, bonuses, or most allowances, which can lead to overestimating the match if you use your total income.
5. Forgetting the Match is Always Traditional: Believing that if you contribute to the Roth TSP, your match will also be Roth. The agency match is always pre-tax and will be taxable upon withdrawal.