federal retirement calculator

How this federal retirement calculator works

If you are a federal employee under FERS (Federal Employees Retirement System), your retirement income usually comes from three sources: your FERS pension, Social Security, and your TSP (Thrift Savings Plan). This page combines those pieces into one simple planning tool so you can test scenarios quickly.

This calculator focuses on your first-year estimate at retirement. It gives you a practical planning number, not a legal or final annuity determination from OPM.

FERS pension formula (core concept)

Your basic annuity is based on your high-3 salary, years of creditable service, and a multiplier.

• Multiplier is usually 1.0% (0.01).
• Multiplier can be 1.1% (0.011) if you retire at age 62 or later with at least 20 years of service.
• Unused sick leave can increase your creditable service time for the annuity calculation.

What is high-3 salary?

Your high-3 is the highest average basic pay you earned during any consecutive 36 months of federal service. Basic pay typically includes locality pay but excludes overtime, bonuses, and some differentials.

Survivor benefit reductions matter

If you elect a survivor annuity for your spouse, your own pension amount is reduced. The calculator lets you choose a common election so you can see the tradeoff between higher income now and survivor protection later.

Adding TSP to your retirement income estimate

Many federal workers underestimate how much TSP can contribute to retirement cash flow. This calculator projects your TSP balance at retirement using:

• Current TSP balance
• Annual contributions before retirement
• Expected annual growth rate

Then it estimates an income stream using a withdrawal rate (default 4%). This is not a guarantee, but it is a useful rule-of-thumb for planning.

Special retirement supplement (SRS): early retirement bridge

If you retire before age 62 and are eligible, the FERS Special Retirement Supplement may bridge income until Social Security eligibility at age 62. This calculator includes a simplified estimate based on your age-62 Social Security amount and your service fraction.

Actual SRS eligibility and reductions (for earnings) can be complex, so always verify details with agency HR and OPM.

How to use this calculator effectively

1) Start with realistic baseline assumptions

Use your latest LES, TSP statement, and earnings history. Avoid overly optimistic return assumptions.

2) Run three scenarios

• Conservative: lower market return and higher tax rate.
• Base case: your best estimate.
• Optimistic: higher returns and delayed retirement.

3) Compare replacement ratios

A quick benchmark is to compare estimated retirement income to your high-3 pay. If your ratio is lower than desired, identify which lever to adjust: retirement age, service years, savings rate, or spending target.

Practical levers to improve your federal retirement outcome

• Work a bit longer: More service years can boost pension and possibly qualify you for the 1.1% multiplier.
• Increase TSP contributions: Even a modest increase compounds over time.
• Protect your high-3: Career timing and pay progression can materially affect your annuity base.
• Plan healthcare early: FEHB in retirement is valuable, but premiums still affect net income.
• Model taxes: Federal + state taxation can significantly reduce spendable income.

Common mistakes federal employees make

• Assuming gross pension equals take-home income.
• Ignoring survivor election reductions.
• Overestimating long-term investment returns.
• Forgetting inflation impact and COLA timing.
• Relying on a single scenario instead of testing multiple paths.

Important reminder

This federal retirement calculator is a planning tool, not an official benefits adjudication. For binding numbers, request your official annuity estimate through your agency benefits office and review OPM documentation before making retirement decisions.