Military Retirement Pay Calculator: BRS vs Legacy, What You'll Actually Receive

Military retirement is one of the most valuable benefits available to US service members, but calculating what you'll actually receive requires knowing which retirement system applies to you and understanding the formulas.

Members who entered service before January 1, 2018 are generally under the Legacy system. Those who entered on or after January 1, 2018 are automatically under the Blended Retirement System (BRS), though eligible members had a one-time window to opt into BRS.

The Legacy System (High-3)

The Legacy retirement, also called "High-3," calculates your retirement pay as:

Monthly retirement pay = 2.5% x years of service x average of your highest 36 months of basic pay

The minimum service for a retirement pension is 20 years. At 20 years, the multiplier is 50%. At 30 years, it's 75%.

Real example: E-7 with 20 years of service

An E-7 at the top step earns approximately $5,200/month in base pay in 2026. Assuming their highest 36 months average $5,000:

• Multiplier: 2.5% x 20 years = 50%
• Monthly pension: 50% x $5,000 = $2,500/month
• Annual: $30,000
• This benefit is inflation-adjusted via COLA each year
• Lasts for life; survives regardless of future employment

An O-5 (Lieutenant Colonel/Commander) with 20 years earns approximately $10,400/month base pay. Their retirement:

• Multiplier: 50%
• Monthly pension: $5,200/month
• Annual: $62,400

The Blended Retirement System (BRS)

BRS reduces the pension multiplier from 2.5% to 2.0% per year but adds three compensating elements:

1. TSP matching: Government contributes 1% automatically, matches next 4% at 100% = up to 5% total employer TSP contribution. Vesting begins immediately for the auto-1%; full match vests at 2 years.

2. Mid-career continuation pay: A one-time lump sum payment (1-13x monthly pay) at the 12-year mark in exchange for a service commitment. Averages around 2.5x monthly pay depending on branch/specialty.

3. Retirement pension: 2.0% x years of service x high-36 average basic pay.

Same E-7 example under BRS:

• Multiplier: 2.0% x 20 years = 40%
• Monthly pension: 40% x $5,000 = $2,000/month
• Annual: $24,000

That's $500/month less than Legacy — but over 20 years of service with 5% TSP matching, the TSP balance can offset and potentially exceed that gap.

TSP accumulation under BRS:

• 5% of E-7 average pay ($4,500/month) = $225/month employer contribution
• Plus 5% personal contribution: $225/month
• Combined monthly: $450
• At 7% annual return over 20 years: approximately $270,000 in TSP

Present value of the $500/month pension gap over a 30-year retirement at 5% discount rate = approximately $92,000. The TSP surplus of $270,000 makes BRS the better financial outcome, assuming you actually contribute.

Comparison Table

| Scenario | Legacy Monthly | BRS Monthly Pension | BRS TSP (est.) | |----------|----------------|---------------------|-----------------| | E-7, 20 years | $2,500 | $2,000 | $270,000 accumulated | | E-7, 25 years | $3,125 | $2,500 | $390,000 accumulated | | O-5, 20 years | $5,200 | $4,160 | $560,000 accumulated | | O-6, 22 years | $8,330 | $6,660 | $700,000 accumulated |

Survivor Benefit Plan (SBP)

When a military retiree dies, retirement pay normally stops. SBP is an optional annuity that continues paying 55% of retired pay to a surviving spouse.

Cost: 6.5% of base retirement pay (pre-tax).

On a $2,500/month retirement:

• SBP cost: $162.50/month
• Net retirement: $2,337.50/month
• If you die, spouse receives: $1,375/month for life

SBP premiums stop after paying for 30 years or at age 70, whichever is later. The decision to elect SBP is usually made at retirement and is very difficult to change.

COLA and Inflation

Legacy retirees receive a full COLA equal to the annual CPI increase. BRS retirees also receive full COLA. Some older hybrid systems used "REDUX" which offered reduced COLA in exchange for a $30,000 career status bonus — REDUX is no longer offered to new members.

Over a 30-year retirement, COLA is significant. A $2,500/month pension in 2026 at 3% average COLA would pay approximately $6,060/month by 2056.

Disability Retirement

Separate from regular retirement, service members medically separated with a rating of 30%+ may qualify for disability retirement. Pay is the higher of:

• Retirement formula (2.5% x years x high-3)
• VA disability rating x base pay

Disability retirement pay may be partially or fully tax-free depending on the ratings involved.

Run the Numbers

Use the CalcMoney FIRE Calculator to model how military pension income factors into your retirement financial independence timeline, alongside any TSP or civilian savings.