FERS & CSRS COLAs explained: the diet COLA and the age-62 wall
Two federal retirees can do everything else identically — same high-3, same service, same survivor election — and still watch their pensions drift apart over time, purely because one is under CSRS and the other under FERS. The reason is the cost-of-living adjustment, and FERS plays by stingier rules: no COLA at all until age 62 for most retirees, and a “diet” cap that pays less than full inflation in the years that matter most. This guide explains exactly how CSRS and FERS COLAs are calculated, why the supplement gets nothing, and — with a projector — how wide the gap can grow across a long retirement.
1. What a COLA actually is
A cost-of-living adjustment is the annual raise built into your federal annuity to help it keep pace with inflation. It isn’t discretionary and it isn’t tied to performance — it’s a formula. Each year, OPM measures the change in the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) from the third quarter of one year to the third quarter of the next. If prices rose, annuities go up; the adjustment is effective December 1 and first shows up in the January payment.
That much is the same for CSRS and FERS. Everything that makes them different — who qualifies, at what age, and how much of the measured inflation actually reaches your check — is where the two systems diverge, and where a lot of money hides over a 25- or 30-year retirement.
2. CSRS: the full COLA, any age
CSRS is the generous one. A CSRS retiree receives the full CPI-W increase as a COLA, applied automatically, at any age — there is no waiting period and no cap. Retire at 55 under CSRS and your annuity starts adjusting for inflation immediately. For 2026 that meant the full 2.8%, the same figure Social Security recipients received.
If you have a CSRS Offset annuity, or a combined CSRS/FERS annuity from a mid-career transfer, the CSRS component is adjusted under these full-COLA rules even though the FERS component follows the stricter FERS rules below.
3. FERS: the age-62 wall
FERS was designed as a three-legged stool — a smaller pension, plus Social Security, plus the TSP — so its COLA rules are deliberately leaner. The first wall is age. A non-disability FERS retiree generally receives no COLA on the basic annuity until age 62. Retire at 57 and your FERS pension stays flat in dollar terms for five years while prices climb; the first adjustment arrives only once you hit 62.
If you retire at the MRA and live on a fixed FERS annuity for several years before 62, inflation quietly shrinks its real value the entire time. The dollar figure doesn’t fall — but what it buys does. Build that flat stretch into your early-retirement budget.
The exceptions matter: disability retirees, survivors, and special-provision retirees (law enforcement officers, firefighters, air traffic controllers) receive COLAs regardless of age. If you’re in one of those groups, the age-62 wall doesn’t apply — see the special provisions guide.
4. The “diet COLA” formula
The second wall is the cap. Even once a FERS retiree is eligible, the adjustment is reduced whenever inflation runs above 2% — the rule advocates nickname the “diet COLA.” The formula is simple:
If CPI-W > 2% and < 3% → FERS COLA = 2.0%
If CPI-W ≥ 3% → FERS COLA = CPI-W − 1%
CSRS and Social Security never face this cap. That’s why, in 2026, CSRS retirees got 2.8% while FERS retirees got exactly 2.0% — inflation landed in the 2–3% band, so the FERS figure was clipped. The single-year gap looks small. Stretched across a long retirement of moderate inflation, it compounds into real money, as the projector below shows.
| CPI-W increase | CSRS / Social Security COLA | FERS COLA |
|---|---|---|
| 1.5% | 1.5% | 1.5% (full) |
| 2.0% | 2.0% | 2.0% (full) |
| 2.8% (2026) | 2.8% | 2.0% (capped) |
| 4.5% | 4.5% | 3.5% (minus 1%) |
| 8.7% (2023) | 8.7% | 7.7% (minus 1%) |
5. Project your COLA gap
Pick your system, a starting annuity, an assumed long-run inflation rate, and a horizon. The projector applies the correct COLA rule each year and shows where your annuity lands — and, for FERS, how far it falls behind an identical CSRS annuity and behind inflation itself.
COLA gap projector
Assumes you’re past the age-62 eligibility point so a COLA applies every year. A simplifying model, not a benefit statement.
6. The supplement gets nothing
If you retire before 62 with an immediate, unreduced annuity, you may receive the FERS annuity supplement — a monthly bridge payment that approximates the Social Security you’re earning, paid until 62. Here’s the catch most people miss: the supplement never receives a COLA. It’s frozen at its starting dollar amount for its entire life.
So a retiree who leaves at 56 and collects the supplement for six years watches that piece of income lose real value the whole way — while, separately, the basic annuity also sits flat until 62. Two fixed-dollar income streams, both eroding, right when spending is often highest. It’s a strong argument for not leaning on the supplement as your margin of safety.
7. Survivors, disability & special provisions
Several groups escape the age-62 wall. Survivor annuitants receive FERS COLAs regardless of age, and the increase applies to both the survivor annuity and, where payable, a survivor’s supplement. Disability retirees get COLAs after the first year — except during any period they’re receiving the 60%-of-high-3 disability rate in the first 12 months. And special-provision retirees — LEOs, firefighters, ATCs — receive COLAs at any age, since they’re expected to retire young under a mandatory-separation regime.
One nuance for survivors and survivor elections: even these groups still face the diet-COLA cap in high-inflation years. The age wall falls away, but the formula cap does not.
8. The Equal COLA Act
The FERS cap has critics, and there’s a recurring legislative attempt to remove it. The Equal COLA Act — reintroduced in the 119th Congress as H.R. 491 and S. 624 — would strike the diet-COLA cap so FERS adjustments match the full CPI-W figure used for CSRS and Social Security. Notably, it would not change the age-62 rule for non-disability FERS retirees.
As of now, the bill has not advanced out of committee or been scored, so it remains a proposal. The honest planning posture: build your retirement around the rules as they exist today — capped FERS COLAs, age-62 start — and treat any future fix as upside rather than a number you can count on.
9. Frequently asked questions
What is the 2026 COLA for federal retirees?
For 2026, CSRS retirees and Social Security recipients receive the full 2.8 percent cost-of-living adjustment, while most FERS retirees receive only 2.0 percent. The difference exists because the CPI-W rose 2.8 percent from the third quarter of 2024 to the third quarter of 2025, and FERS rules cap the adjustment at 2.0 percent whenever inflation lands between 2 and 3 percent. The increase took effect December 1, 2025 and first appears in the January 2026 payment. Retirees who were on the rolls for only part of 2025 receive a prorated share in their first year.
Why don’t FERS retirees get a COLA until age 62?
When Congress designed FERS, it paired a smaller, COLA-limited pension with Social Security and the TSP, so the basic FERS annuity generally pays no cost-of-living adjustment until the retiree reaches age 62. Before then, a non-disability FERS retiree’s annuity stays flat in nominal terms even as prices rise. The main exceptions are disability retirees, survivors, and special-provision retirees such as law enforcement officers, firefighters, and air traffic controllers, who receive COLAs regardless of age. CSRS, by contrast, pays the full COLA at any age.
What is the FERS diet COLA formula?
The diet COLA is the cap that makes FERS adjustments smaller than CSRS or Social Security in higher-inflation years. If the CPI-W increase is 2 percent or less, FERS gets the full amount. If the increase is more than 2 but less than 3 percent, FERS is limited to exactly 2.0 percent. If inflation exceeds 3 percent, the FERS COLA equals the CPI-W increase minus one percentage point. CSRS and Social Security always receive the full CPI-W figure with no such cap, which is why a multi-year stretch of 2 to 4 percent inflation quietly widens the gap between otherwise identical retirees.
Does the FERS annuity supplement get a COLA?
No. The FERS annuity supplement, sometimes called the Special Retirement Supplement, never receives a cost-of-living adjustment. It is fixed at the amount calculated when you retire and stays at that dollar figure until it ends at age 62, when you become eligible for Social Security. Because it doesn’t grow with inflation, the supplement loses real purchasing power every year you collect it, which matters most for those who retire in their mid-fifties and rely on it for six or seven years before Social Security begins.
Could the FERS COLA cap ever be removed?
It could, but only through legislation. The Equal COLA Act, reintroduced in the 119th Congress as H.R. 491 and S. 624, would remove the FERS cap so the adjustment matches the full CPI-W figure used for CSRS and Social Security. The bill would not change the age-62 rule for non-disability FERS retirees. As of now it has not advanced out of committee or been scored, so it remains a proposal rather than current law. Plan around the rules as they exist today, and treat any change as a bonus if it happens.
- OPM, Cost-of-Living Adjustments FAQ
- Government Executive, 2026 COLAs and earnings limits
- Congressional Research Service, COLAs for Federal Civil Service Annuities (94-834)
- CRS, The FERS COLA and the Equal COLA Act (IF12354)
- eCFR, 5 CFR Part 841 Subpart G — COLAs
- MyFederalRetirement, when the COLA is paid