Military Retirement Calculator

Start by entering your service details. Your Base Pay at Retirement is your highest 36-month average basic pay, which is the foundation of the pension calculation. Next, enter your total Years of Service at your planned retirement date. This directly impacts your pension multiplier.

Then, select your Retirement System. This is a critical input. Choose "High-3" if you entered service before 1986, "Redux" if you entered between 1986 and 2018 and opted for the Career Status Bonus, or "Blended Retirement System (BRS)" if you entered service in 2018 or later (or opted in). Each system has different rules for multipliers and COLA.

Next, input your TSP details. Enter your current TSP Balance and the Expected TSP Return you anticipate during your retirement years. The TSP is a key part of military retirement, especially under BRS, which includes a government match. Use the TSP match calculator to see how contributions grow.

Finally, set your assumptions for the COLA Rate. This is the annual percentage your retired pay will increase to keep up with inflation. If you want a more detailed long-term view, open the Advanced Settings to adjust the Years in Retirement and your Pre-Retirement Annual Salary to calculate an accurate income replacement rate.

Base Pay at Retirement

This is the average of your highest 36 months of basic pay. For most service members, this will be the average of their last three years of service. This figure is the primary basis for calculating your defined benefit pension. Do not include allowances like BAH or BAS. For a more detailed look at this specific calculation, use the military High-3 calculator.

Years of Service

This is the total number of active-duty years you will have served when you retire. The standard non-disability military retirement requires a minimum of 20 years of service. Each year of service increases your pension multiplier, directly boosting your lifetime retired pay.

Retirement System

The U.S. military has three primary retirement systems for those who serve 20 years or more:

• High-3: The legacy system providing a pension calculated at 2.5% per year of service.
• Redux (CSB/REDUX): An option for those who entered service between 1986 and 2018. It offered a $30,000 Career Status Bonus in exchange for a lower pension multiplier (2.0%) and a reduced COLA.
• Blended Retirement System (BRS): The current system for new entrants since 2018. It combines a smaller pension (2.0% multiplier) with a generous government-matched Thrift Savings Plan (TSP) component.

Your retirement system dramatically affects your total retirement compensation, so choosing the correct one is essential for an accurate projection.

TSP Balance & Expected Return

The Thrift Savings Plan (TSP) is a retirement savings and investment plan for Federal employees and members of the uniformed services, including the Ready Reserve. It is a defined contribution plan, similar to a civilian 401(k) calculator. Your TSP Balance is the amount you've saved, and the Expected Return is the average annual growth you expect from your investments in retirement.

COLA Rate

The Cost-of-Living Adjustment (COLA) is an annual increase to your retired pay designed to protect your purchasing power from the effects of inflation. It is typically based on the Consumer Price Index (CPI). Under the High-3 and BRS systems, you receive the full COLA. Under Redux, your COLA is reduced to CPI minus 1%, which can significantly erode your income over a long retirement.

Advanced Settings

• Years in Retirement: This helps the calculator estimate lifetime pension value and project how long TSP withdrawals will last. A longer retirement requires more savings. See how long will $500k last in retirement for context.
• Pre-Retirement Annual Salary: This figure, which should include base pay and allowances, is used to calculate your income replacement rate—the percentage of your working income that your retirement income will replace. This helps you understand if you're on track to maintain your lifestyle. Many planners suggest a target of 70-80%, which you can explore in our guide to what is a good retirement income.

This calculator provides a comprehensive estimate of your military retirement income by modeling its two main components: the defined benefit pension (retired pay) and the defined contribution plan (TSP).

First, it determines your pension multiplier by multiplying your years of service by the percentage specific to your retirement system (2.5% for High-3, 2.0% for Redux and BRS). This multiplier is then applied to your base pay to find your initial monthly retired pay.

Second, it estimates a sustainable monthly income from your TSP balance. It uses an annuity formula based on your total TSP savings, your expected investment return, and the number of years you plan to be in retirement.

Finally, the calculator projects your retired pay forward year by year, applying the annual COLA you entered. It accounts for the reduced COLA under the Redux system. The results show your total initial monthly income, your income replacement rate, and a chart illustrating how your pension grows over time, providing a clear picture of your financial future.

The calculations are performed in several steps to determine your total retirement income from both your pension and TSP.

Pension Multiplier

The multiplier determines what percentage of your base pay you will receive as a pension.

multiplier_per_year = IF(retirement_system is High-3, 2.5%, 2.0%)
pension_multiplier = years_of_service x multiplier_per_year

Monthly Retired Pay

This is your initial monthly pension before any Cost-of-Living Adjustments (COLA).

monthly_retired_pay = base_pay x (pension_multiplier / 100)

TSP Monthly Income

This formula provides a simple annuity-style estimate of the monthly income your TSP balance could generate over your retirement.

monthly_tsp_return = expected_tsp_return / 100 / 12
total_months = years_in_retirement x 12
tsp_monthly_income = (tsp_balance x monthly_tsp_return) / (1 - (1 + monthly_tsp_return)^(-total_months))

Annual Retired Pay with COLA

The calculator projects your pension's growth over time, accounting for COLA. The formula for a given year is:

cola_rate_adjustment = IF(retirement_system is Redux, cola_rate - 1%, cola_rate)
annual_retired_pay_in_year_N = (monthly_retired_pay x 12) x (1 + cola_rate_adjustment)^N

Income Replacement Rate

This measures how much of your pre-retirement income is replaced by your total retirement income.

total_annual_income = (monthly_retired_pay + tsp_monthly_income) x 12
replacement_rate = (total_annual_income / pre_retirement_annual_salary) x 100

Your retirement plan is one of the most valuable benefits of a military career, but the details depend heavily on which system you fall under.

1. The High-36 (High-3) System

The High-3 system is a traditional defined-benefit pension plan. If you entered the service before January 1, 2018, and did not opt into BRS, you are likely covered by this plan.

• Pension Formula: 2.5% x Years of Service x Average of Highest 36 Months of Basic Pay.
• Key Feature: A 20-year career yields a pension worth 50% of your high-36 basic pay. A 30-year career yields 75%.
• COLA: Receives the full annual Cost-of-Living Adjustment based on the Consumer Price Index.

This system provides a strong, reliable pension but includes no government matching for TSP contributions. Your TSP grows based on your contributions and market performance alone.

2. The CSB/REDUX System

This system was offered to service members who entered between August 1, 1986, and December 31, 2017. It required a choice at the 15-year mark: remain in the High-3 system or take a $30,000 Career Status Bonus (CSB) and switch to the REDUX formula.

• Pension Formula: 2.0% x Years of Service x Average of Highest 36 Months of Basic Pay (for the first 20 years). The multiplier is slightly higher for service beyond 20 years.
• Key Feature: The upfront bonus comes at a significant long-term cost.
• COLA: The Cost-of-Living Adjustment is reduced to CPI minus 1%. This reduced COLA is the biggest drawback, as its effect compounds over decades, severely eroding purchasing power compared to the High-3 system.

3. The Blended Retirement System (BRS)

BRS is the newest system, applying to all who joined on or after January 1, 2018. It combines a smaller defined-benefit pension with a more robust, government-matched defined contribution plan (TSP).

• Pension Formula: 2.0% x Years of Service x Average of Highest 36 Months of Basic Pay. A 20-year career yields a 40% pension.
• TSP Matching: This is the cornerstone of BRS. After 60 days of service, you receive an automatic 1% government contribution to your TSP. After two years, the government will match your contributions up to an additional 4%, for a total of 5% in government money when you contribute 5%. Use the TSP match calculator to see the impact.
• COLA: Receives the full annual COLA, just like the High-3 system.

BRS gives service members more ownership over their retirement but requires active participation in the TSP to realize its full value.

The TSP is the military's version of a civilian 401(k). It's a critical tool for building wealth, regardless of your retirement system. Under BRS, it's the central component of your retirement package.

You can contribute to a Traditional (pre-tax) TSP or a Roth (after-tax) TSP. For 2026, you can contribute up to $23,500 per year. Contributions are made directly from your pay.

The TSP offers several simple, low-cost investment funds:

• G Fund: Government securities, no risk of principal loss.
• F Fund: Fixed income index fund.
• C Fund: Follows the S&P 500 index.
• S Fund: Follows small- and mid-cap stocks.
• I Fund: Follows international stocks.
• L Funds: Lifecycle funds that automatically adjust their mix of the other funds based on a target retirement date.

For BRS members, contributing at least 5% of your basic pay is essential to receive the full government match. Failing to do so is like turning down a 5% pay raise.

• Military Retirement Score: This score is based on your income replacement rate. A score above 80 is considered strong, suggesting your projected retirement income will be close to your pre-retirement salary. A lower score indicates a potential income gap.
• Monthly Retired Pay: This is the core of your benefit—the guaranteed monthly pension you will receive for life, adjusted annually for COLA.
• TSP Monthly Income: This is an estimate of how much you could sustainably withdraw from your TSP each month. This is not a guaranteed amount and depends on market performance.
• Total Monthly Income: The sum of your pension and estimated TSP income, giving you a complete picture of your initial retirement cash flow.
• Replacement Rate: This key metric shows what percentage of your pre-retirement salary is covered by your retirement income. A higher rate means a smoother transition to your post-service life.
• Retired Pay Projection Chart: This visualizes the power of COLA. You can see how your guaranteed pension income grows over a 30-year period, helping to offset inflation.

If your projected income is lower than you'd like, you have several levers to pull:

1. Serve Longer: Each additional year of service directly increases your pension multiplier, permanently boosting your retired pay.
2. Maximize TSP Contributions: This is the most powerful tool for BRS members. Strive to contribute at least 5% to get the full match, and aim for the annual maximum ($23,500 for 2026) if possible.
3. Choose an Appropriate TSP Allocation: Younger service members may benefit from a more aggressive allocation (more C, S, and I funds) to maximize long-term growth.
4. Plan a Second Career: Most military members retire in their early 40s, an ideal time to start a second career. The income from a civilian job can supplement your retired pay and allow your TSP to grow untouched for another 10-20 years.
5. Consider VA Disability: If you have service-connected disabilities, VA disability compensation is a tax-free monthly benefit that is not included in this calculator but can significantly improve your financial picture. For some, Concurrent Retirement and Disability Pay (CRDP) or Combat-Related Special Compensation (CRSC) may be possible. See the CRSC Pay Calculator.

1. Ignoring the TSP: For BRS members, the pension is only one part of the system. Failing to contribute and get the match neuters the plan's value. Even for High-3 members, the TSP is a vital tool for wealth creation.
2. Underestimating the Redux COLA Penalty: The $30,000 bonus for choosing Redux can seem tempting, but the reduced COLA (CPI-1%) results in a massive loss of purchasing power over a 30+ year retirement.
3. Forgetting about Taxes: Military retired pay is taxable at the federal level and in most states. VA disability pay is tax-free. Plan accordingly. See our list of the best states to retire for taxes.
4. Neglecting the Survivor Benefit Plan (SBP): At retirement, you must decide whether to enroll in the SBP. It provides a continuing annuity (up to 55% of your retired pay) to your spouse if you pass away, in exchange for a premium deducted from your pay. Declining it can leave your spouse with no military-related income.
5. Not Having a Post-Service Plan: Your military pension provides a great foundation, but it may not be enough to fully fund retirement, especially if you retire in your 40s. A plan for a second career or other income streams is crucial. Use our general retirement calculator to model a complete picture.