If you work for the Philippine government, your retirement pension comes from the GSIS (not SSS), and it’s computed with a formula set by RA 8291, the GSIS Act of 1997. This guide walks through how your GSIS retirement pension is calculated, step by step — so you can estimate your own pension long before you file anything. Private-sector employee? Your retirement is with SSS instead — estimate it with the SSS Pension Calculator.
The formula
Basic Monthly Pension (BMP) = 2.5% × RAMC × years of service
RAMC = AMC + ₱700Two guardrails apply:
- The BMP is capped at 90% of your AMC.
- GSIS also enforces a minimum monthly pension — set by board resolution, not fixed in the law. It has been ₱6,000 since February 2019 (for old-age and disability pensioners).
Strictly, the law (RA 8291, Section 9) states the BMP as 37.5% of RAMC, plus 2.5% of RAMC for each year of service beyond 15. Since 37.5% = 2.5% × 15, that collapses into the simple one-liner above for anyone with 15 or more years of service — which is what an old-age pension requires anyway (more on that below).
What AMC and RAMC mean
AMC (Average Monthly Compensation) is your total compensation during your last 36 months of service, divided by 36 (or by your actual months if you have fewer), subject to a ceiling set by the GSIS Board. Because it’s an average, a promotion near the end lifts your AMC — but only in proportion to the months you actually received the higher pay.
RAMC (Revalued AMC) is defined in the law as 170% of the first ₱1,000 of your AMC plus 100% of the rest. For any AMC of at least ₱1,000 — effectively everyone — that works out to simply AMC + ₱700.
GSIS pension computation: a step-by-step example
Say your AMC is ₱30,000 and you retire with 20 years of service:
- RAMC = 30,000 + 700 = ₱30,700
- BMP = 2.5% × 30,700 × 20 = 767.50 × 20 = ₱15,350
- Cap check: 90% × 30,000 = ₱27,000 — ₱15,350 is well under it
- Monthly pension: ₱15,350, for life — about 51% of your AMC.
Each year of service is worth 2.5% of your RAMC, so the pension scales like this:
| Years of service | BMP as % of RAMC |
|---|---|
| 15 | 37.5% |
| 20 | 50% |
| 25 | 62.5% |
| 30 | 75% |
| 35 | 87.5% |
— always subject to the 90%-of-AMC cap.
When the 90% cap kicks in
Long service on a modest salary can push the formula past the cap. Say your AMC is ₱20,000 with 35 years of service:
- RAMC = 20,000 + 700 = ₱20,700
- BMP = 2.5% × 20,700 × 35 = 517.50 × 35 = ₱18,112.50
- Cap: 90% × 20,000 = ₱18,000 — the formula result exceeds it
- Monthly pension: ₱18,000 (the cap wins).
The two retirement options
The BMP is only half the story. RA 8291 (Section 13) lets a qualifying retiree choose one of two payout options when applying:
| Option 1: 5-year lump sum | Option 2: Cash + immediate pension | |
|---|---|---|
| Upfront payment | 60 × BMP at retirement | 18 × BMP at retirement |
| Monthly pension starts | After 5 years | Immediately |
| For our ₱15,350 example | ₱921,000 now, pension from year 6 | ₱276,300 now + ₱15,350/month |
Option 1 pays your first five years of pension in advance as one lump sum (60 × BMP). You receive no monthly pension during that five-year guaranteed period — it was already paid out — and the lifetime monthly pension starts once it lapses.
Option 2 pays a cash amount of 18 × BMP upon retirement on top of — not as an advance against — a monthly pension for life that starts immediately.
You elect one option when you file your claim with GSIS.
Who qualifies for the old-age pension
Under RA 8291 (Section 13-A) you must meet all three conditions:
- At least 15 years of creditable service;
- At least 60 years old at retirement — 60 is the optional retirement age, and retirement is compulsory at 65 if you already have 15 years of service (unless the appropriate authorities extend you);
- Not receiving a GSIS permanent total disability pension.
A few practical notes:
- RA 8291 covers members who retired on or after June 24, 1997; earlier retirees fall under the older laws (RA 660, RA 1616, PD 1146).
- Your last three years of service need not be continuous under RA 8291 — unlike the older RA 660 scheme, which requires it.
- If you reach 65 with fewer than 15 years, civil service rules may allow a limited extension of service to complete them — but it’s discretionary, not a right.
- Bills to lower the 15-year minimum to 10 years (matching SSS) have been filed in Congress but have not been enacted.
Leaving before retirement: the separation benefit (GSIS “separation pay”)
If you leave government service before qualifying for retirement, RA 8291 (Section 11) provides a separation benefit — often searched as GSIS “separation pay”: a one-time cash payment if you have fewer than 15 years, or cash plus a deferred pension if you have 15 or more years but are under 60:
| Service | What you get | When it’s paid |
|---|---|---|
| Under 3 years | No separation benefit under Section 11 | — |
| 3 to under 15 years | One-time cash: 100% of AMC × years with paid contributions, minimum ₱12,000 | At age 60 or upon separation, whichever is later |
| 15+ years, below age 60 | 18 × BMP cash, plus BMP monthly for life | Cash at separation; pension starts at 60 |
So if you resign at 40 with 10 years of service (contributions paid throughout) and an AMC of ₱30,000, you’re in line for a ₱300,000 cash payment — but only when you turn 60. Leave at 45 with 18 years, and you get the 18 × BMP cash immediately, with the monthly pension itself starting at 60. Run your own numbers with the GSIS Separation Pay Calculator.
Two cautions. GSIS claims other than life insurance and retirement prescribe after 4 years, so file your separation claim within 4 years of leaving even if the cash is released later. And if you leave with under 3 years of service, confirm your situation directly with GSIS — the law itself grants no separation benefit at that length.
Frequently asked questions
How do I compute my basic monthly pension in GSIS? Take your average monthly compensation over your last 36 months (AMC), add ₱700 to get your RAMC, then multiply: 2.5% × RAMC × years of service. Cap the result at 90% of your AMC. GSIS also applies a minimum monthly pension set by board resolution — ₱6,000 since February 2019.
How much is the GSIS pension for 15 years of service? Exactly 15 years earns 37.5% of your RAMC. With an AMC of ₱25,000, that’s 37.5% × ₱25,700 = ₱9,637.50 per month.
Is the GSIS pension taxable? No. GSIS benefits — lump sums and monthly pensions alike — are exempt from income tax under Section 39 of RA 8291 and the Tax Code (NIRC Sec. 32(B)(6)(f)), with no age or service conditions. No withholding is applied to pension payments.
Does the GSIS pension increase every year? Not by law. Adjustments are recommended by the GSIS actuary and approved by the Board (and, for the BMP, by the President). In practice GSIS has periodically granted board-approved increases, plus a Christmas cash gift in recent years — board policy, not a statutory entitlement. Increases are announced on gsis.gov.ph.
Where can I get my official computation? Register on eGSISMO (the GSIS member portal) or the GSIS Touch app to see your service record, premiums, and a tentative computation of your benefits. GSIS doesn’t publish a public pension calculator, so pair our estimator with your own eGSISMO record when planning.
Estimate your own figure with the GSIS Pension Calculator — and if retirement is still a while away, see what you actually keep today with the Take-Home Pay Calculator.