FERS & CSRS COLA History (1999–2026)
Every federal retiree cost-of-living adjustment for the past 28 years — CSRS and FERS side by side, with the gap calculated.
2027 COLA Watch: Running at ~3.0% (May 2026 CPI-W data)
Through April 2026, the CPI-W is tracking approximately 3.0% above the third-quarter 2025 baseline. If that holds through September 2026, CSRS and Social Security retirees would receive a 3.0% COLA in January 2027 — and FERS retirees would receive 2.0% (CPI-W minus 1%). The official announcement comes in October 2026. Track the live 2027 COLA estimate →
How Federal Retiree COLAs Work
CSRS retirees receive the full CPI-W increase every year. FERS retirees receive a reduced “diet COLA” whenever inflation exceeds 2%. The 2026 COLA: 2.8% for CSRS, 2.0% for FERS.
Federal retirees under both CSRS and FERS receive annual cost-of-living adjustments tied to the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W). The COLA is measured as the percentage change in the CPI-W from the average of July–September of the prior base year to the average of July–September of the current year. The adjustment is effective December 1 and first appears in the January annuity payment.
The key difference between systems is the FERS reduction rule, written into law when FERS was created in 1986:
- CPI-W 0%–2%: FERS COLA equals the full CPI-W increase (same as CSRS).
- CPI-W 2%–3%: FERS COLA is capped at 2.0%, regardless of the actual CPI-W.
- CPI-W above 3%: FERS COLA equals CPI-W minus 1.0 percentage point (the “diet COLA”).
- Negative CPI-W: No COLA is paid under either system; there are no negative adjustments.
One additional FERS rule that catches many retirees off guard: most FERS annuitants receive no COLA until they reach age 62. Disabled FERS retirees and FERS survivor annuitants are exempt from this age restriction and receive COLAs immediately upon retirement.
FedTools Analysis: How the Gap Has Compounded (1999–2026)
Compounding a $1,000/month pension through every COLA from January 1999 through January 2026 (28 adjustments):
FedTools calculation based on a hypothetical $1,000/month pension at the start of 1999. Actual dollar gap scales proportionally with your starting pension amount. Sources: OPM BAL annual COLA notices, SSA CPI-W series.
The Diet-COLA Penalty by Retirement Year
FedTools 2026 analysis: cumulative COLA growth through January 2026 for a retiree whose first adjustment arrived in each start year, per $1,000/month of starting pension.
| First COLA | CSRS Growth | FERS Growth | $1,000/mo Becomes (CSRS) | $1,000/mo Becomes (FERS) | Monthly Gap |
|---|---|---|---|---|---|
| January 1999 | +103.3% | +79.8% | $2,033 | $1,798 | $235 |
| January 2005 | +76.1% | +59.8% | $1,761 | $1,598 | $163 |
| January 2010 | +47.4% | +39.0% | $1,474 | $1,390 | $84 |
| January 2015 | +37.8% | +31.2% | $1,378 | $1,312 | $66 |
| January 2020 | +28.8% | +23.6% | $1,288 | $1,236 | $52 |
Methodology: each COLA in the table below compounded from the listed start year through the January 2026 adjustment, using the same OPM/SSA source data. Zero-COLA years (2010, 2011, 2016) are included as 0%. The gap scales with pension size — multiply by your actual starting annuity in thousands.
FERS & CSRS COLA History: 1999–2026
All figures are the COLA applied effective December 1, first paid January 1 of the listed year. FERS rates apply to annuitants age 62 or older at time of adjustment.
| Year | CPI-W Change | CSRS COLA | FERS COLA (age 62+) | Gap |
|---|---|---|---|---|
| 1999 | 2.4% | 2.4% | 2.0% | 0.4pp |
| 2000 | 2.5% | 2.5% | 2.0% | 0.5pp |
| 2001 | 3.5% | 3.5% | 2.5% | 1.0pp |
| 2002 | 2.6% | 2.6% | 2.0% | 0.6pp |
| 2003 | 1.4% | 1.4% | 1.4% | Equal |
| 2004 | 2.1% | 2.1% | 2.0% | 0.1pp |
| 2005 | 2.7% | 2.7% | 2.0% | 0.7pp |
| 2006 | 4.1% | 4.1% | 3.1% | 1.0pp |
| 2007 | 3.3% | 3.3% | 2.3% | 1.0pp |
| 2008 | 2.3% | 2.3% | 2.0% | 0.3pp |
| 2009 | 5.8% | 5.8% | 4.8% | 1.0pp |
| 2010 | ≤ 0% | 0% | 0% | Equal |
| 2011 | ≤ 0% | 0% | 0% | Equal |
| 2012 | 3.6% | 3.6% | 2.6% | 1.0pp |
| 2013 | 1.7% | 1.7% | 1.7% | Equal |
| 2014 | 1.5% | 1.5% | 1.5% | Equal |
| 2015 | 1.7% | 1.7% | 1.7% | Equal |
| 2016 | ≤ 0% | 0% | 0% | Equal |
| 2017 | 0.3% | 0.3% | 0.3% | Equal |
| 2018 | 2.0% | 2.0% | 2.0% | Equal |
| 2019 | 2.8% | 2.8% | 2.0% | 0.8pp |
| 2020 | 1.6% | 1.6% | 1.6% | Equal |
| 2021 | 1.3% | 1.3% | 1.3% | Equal |
| 2022 | 5.9% | 5.9% | 4.9% | 1.0pp |
| 2023 | 8.7% | 8.7% | 7.7% | 1.0pp |
| 2024 | 3.2% | 3.2% | 2.2% | 1.0pp |
| 2025 | 2.5% | 2.5% | 2.0% | 0.5pp |
| 2026 | 2.8% | 2.8% | 2.0% | 0.8pp |
| Cumulative | 28 years | +103.3% | +79.8% | 23.5pp |
Table legend
Shaded rows = high-inflation years where CSRS/FERS gap was largest (COLA ≥ 5%)
Gray rows = zero-COLA years (2010, 2011, 2016)
pp = percentage points (difference in COLA rates between CSRS and FERS)
Cumulative = compound total of all 28 annual adjustments, not a simple sum
See How COLA Affects Your Pension
Run your FERS retirement numbers with our free calculator — includes High-3, service years, and survivor benefit options.
Frequently Asked Questions
Why do FERS retirees get a smaller COLA than CSRS retirees?
Congress deliberately reduced the FERS COLA as part of FERS design when it was created in 1986. The rationale was that FERS retirees also receive Social Security (which gives a full CPI-W COLA) and TSP savings, so their pension COLA could be trimmed. The FERS rule: if CPI-W rises between 2% and 3%, FERS COLA is capped at 2.0%; if CPI-W exceeds 3%, FERS COLA = CPI-W minus 1 percentage point.
When does a FERS retiree start receiving COLA?
Most FERS retirees must reach age 62 before they receive any cost-of-living adjustments on their pension. There are two exceptions: disabled FERS retirees receive COLAs regardless of age, and FERS survivor annuitants (spouses and children) receive COLAs regardless of age. CSRS retirees receive COLAs at any age.
When is the COLA announced and when does it take effect?
The Social Security Administration announces the COLA each October, typically in the third week. The adjustment is effective December 1 of the same year, and the higher payment first appears in the January annuity check (paid on the first business day of January).
How is the COLA percentage calculated?
The COLA equals the percentage change in the average CPI-W (Consumer Price Index for Urban Wage Earners and Clerical Workers) during the third quarter (July–September) of the current year compared to the third quarter of the last year in which a COLA was paid. If the CPI-W average was lower than the prior base year, the COLA is zero — it can never be negative.
Why were there zero COLAs in 2010, 2011, and 2016?
Following the 2008 financial crisis, energy prices fell sharply. The CPI-W in the third quarter of 2009 and 2010 was below the 2008 base used for COLA calculations, so no adjustment was made. Similarly, the CPI-W in the third quarter of 2015 was below the 2014 base (when the last positive COLA was set), so the 2016 COLA was also zero.
How much has the FERS COLA gap compounded since 1999?
Compounding every COLA from January 1999 through January 2026, a CSRS pension grew by 103.3% while an equivalent FERS pension grew by 79.8%. A $1,000/month CSRS pension from 1999 is now about $2,033/month, while the FERS equivalent is about $1,798/month — a $235/month gap, or roughly $2,820/year, from a single $1,000 starting point.
What is the 2027 COLA forecast?
As of August 2026, the leading projection is 3.6% (The Senior Citizens League, updated August 12 after July CPI-W data), with the analyst range running 3.6% to 3.8%. At any CPI-W above 3%, the FERS COLA equals CPI-W minus 1 percentage point — so a 3.6% CSRS COLA would mean roughly 2.6% for FERS. The official number is announced in mid-October 2026.
What is the CSRS COLA for 2026?
The 2026 COLA, effective December 1, 2025 and first paid in January 2026, is 2.8% for CSRS retirees. Because the CPI-W increase fell between 2% and 3%, the FERS COLA was capped at 2.0% — a 0.8-point diet-COLA reduction for 2026.
Do CSRS Offset employees get the same COLA as regular CSRS?
CSRS Offset employees (those who paid Social Security taxes on top of CSRS contributions) receive the full CSRS COLA rate on their CSRS Offset annuity, the same as regular CSRS retirees. The "offset" only affects how their benefit is coordinated with Social Security at age 62 — it does not reduce the COLA rate.
Data sources
OPM Benefits Administration Letters (BAL XX-101 series), annual COLA notices 1999–2026. opm.gov
SSA CPI-W Cost-of-Living Adjustments series. ssa.gov
NARFE Civil Service COLA History Fact Sheet, January 2023. narfe.org
FERS COLA reduction rule: 5 U.S.C. § 8462; OPM CSRS/FERS Handbook Chapter 2. opm.gov