Federal Pension Present Value Calculator (FERS & CSRS)

Your FERS or CSRS annuity is a guaranteed, inflation-linked income stream for life. But how does it compare to a TSP balance? And what is it actually worth in today's dollars — accounting for time value of money, COLA, and the critical difference between FERS (no COLA before age 62) and CSRS (full CPI from day one)? This calculator converts your annual pension into a present-value lump sum, shows the TSP equivalent, and projects year-by-year income with accurate COLA modeling.

How to read the numbers

Present value (PV) answers: "If someone handed you a lump sum today to replace your entire future pension income stream forever, how large would that check need to be?" It discounts future payments to today's dollars using your chosen rate. A $50,000/year pension paid for 27 years is not worth $1.35 million in today's terms because a dollar 20 years from now is worth considerably less than a dollar today. The higher your assumed return, the more heavily future payments are discounted — producing a lower PV. At the TSP G Fund rate (~4.4%), the PV is higher because the implied opportunity cost is low.

TSP equivalent at 4% SWR is a different number with a different interpretation: it answers "how much TSP would I need at a 4% safe withdrawal rate to generate the same first-year income?" This is simply annual pension ÷ 4%. It ignores the pension's COLA adjustments and the critical fact that a TSP balance is finite — it can run out. The pension keeps paying at age 95; a TSP withdrawal strategy can run dry. That longevity insurance is not captured by the 4% TSP equivalent. The pension is almost always worth more than this number over a full retirement, especially at long life expectancies.

FERS pre-62 COLA freeze: FERS retirees who leave before 62 face a period of zero COLA under 5 U.S.C. §8462. If you retire at 57 with a $55,000 annuity, that pension pays $55,000/year in year 5 at age 61, the same nominal dollar as year 1. Inflation has eroded its real value by approximately 5–8% (at 1–1.5% annual inflation) before the first COLA ever applies. The year-by-year table below shows this explicitly: the pension column stays flat until age 62, then begins growing.

FERS vs. CSRS: why CSRS pensions carry higher present value

A $50,000/year CSRS pension is worth materially more than a $50,000/year FERS pension — even with the same discount rate and life expectancy — for two reasons:

• COLA from day one. A CSRS retiree receives a full CPI-W adjustment beginning with the first January after retirement. A FERS retiree who retires at 60 receives no COLA until January following their 62nd birthday — a gap of approximately 2–5 years depending on retirement date.
• Full CPI, no diet cap. After 62, FERS gets a capped COLA (2% max when CPI is 2–3%; CPI minus 1pp when CPI exceeds 3%). CSRS always gets the full CPI-W. Over 30 years at 3% average CPI, FERS COLA compounds at roughly 2.1% while CSRS COLA compounds at the full 3.0% — a difference of nearly 30% in total purchasing power by year 30.

To compare the two systems, run the calculator twice: once with system set to FERS and COLA at 1.8%, and once with CSRS and COLA at 2.8%, using the same starting pension and life expectancy. The difference in present value is the implicit dollar cost of FERS's diet COLA structure.

Why pension PV does not replace the "how much TSP do I need" question

A common planning error: seeing the pension PV ($700K–$900K on a $50K pension) and assuming "I barely need any TSP." That reasoning fails for four reasons:

• The pension is illiquid. You cannot sell it, borrow against it for emergencies, or accelerate distributions. A large healthcare bill, home repair, or family need cannot be met from the pension — only from liquid assets.
• The pension provides no Roth conversion runway. The best federal retirement tax strategy often involves converting traditional TSP or IRA dollars to Roth during the early-retirement low-income window. That requires TSP assets to convert. A pension-only retiree cannot execute this strategy.
• IRMAA brackets are driven by income, not assets. A large pension plus Social Security can push you into IRMAA Medicare surcharges ($109,000+ single in 2026 for first tier). TSP Roth conversions made before Social Security starts can smooth your MAGI over time — but only if you have TSP to work with.
• Estate and survivor goals require liquidity. A survivor annuity election reduces your pension. If you want to leave a legacy or self-insure the survivor benefit through life insurance or savings, that requires liquid capital.

Use the Federal Retirement Savings Target Calculator to find the TSP balance you need on top of your pension floor — taking your actual annuity into account so you don't overstate the TSP requirement.

Pension survivorship: what happens to the present value when you die first

The present value calculation above assumes you live to your stated life expectancy and collect every payment. In practice, what happens to the pension stream at your death depends on your survivor annuity election at retirement:

• No survivor election: Pension ends at your death. Present value = value to you alone.
• 50% survivor election: At your death, your surviving spouse receives 50% of the pre-reduction annuity for their lifetime. This dramatically extends the pension's present value for a couple — but costs you a 10% reduction to your own annuity while you are alive.
• 25% survivor election: Spouse receives 25% at your death; costs 5% reduction while alive.

The survivor annuity meaningfully increases the pension's total household present value in most couples scenarios — particularly when the spouse has longer life expectancy. Use the Survivor Annuity vs. Life Insurance Calculator to compare the election cost against a private life insurance strategy.

Integrate your pension into a complete retirement plan

The pension's present value is the starting point — not the complete picture. TSP withdrawal sequencing, Roth conversion timing, FEHB/Medicare enrollment, survivor election, Social Security optimization, and IRMAA management all interact with the pension's income floor in ways that are genuinely complex. A fee-only advisor who specializes in federal employee benefits has modeled these trade-offs many times and knows which decisions are reversible and which lock in consequences for decades.

1. 5 U.S.C. §8462 — FERS COLA formula: pre-62 zero COLA, post-62 diet COLA (full CPI if ≤2%; capped at 2% if CPI 2–3%; CPI minus 1pp if CPI >3%): uscode.house.gov §8462
2. 5 U.S.C. §8340 — CSRS COLA: full CPI-W adjustment from first payment: uscode.house.gov §8340
3. OPM Benefits Administration Letter — 2026 COLA rates: FERS 2.0%, CSRS 2.8% effective January 2026: opm.gov BAL announcements
4. SSA Period Life Table (2021) — life expectancy at age 60–62 for actuarial assumptions: ssa.gov period life table
5. TSP G Fund returns and expense ratios — TSP.gov 2026 fund performance sheet: tsp.gov fund performance
6. Values verified June 2026. FERS/CSRS COLA rules based on OPM guidance and 5 U.S.C. Chapters 83–84. Calculator outputs are estimates for planning purposes only; actual annuity amounts are determined by OPM.