Federal Retirement COLA Rules: FERS, CSRS, Eligibility, and Calculation

Federal retirement cost-of-living adjustment rules split along two systems. If you retired under the Civil Service Retirement System, you get the full CPI-W increase at any age. If you retired under the Federal Employees Retirement System, you generally wait until age 62 and receive a smaller adjustment set by a three-tier formula. For 2026, that produces a 2.8% increase for CSRS annuitants and 2.0% for FERS annuitants.¹

CSRS Eligibility Has No Age Requirement

Retire under CSRS at 55 and you start receiving annual adjustments the very next cycle. The statute only requires that your annuity commence on or before December 1 of the year the increase takes effect.² The only limit on that first year is proration, covered below.

CSRS retirees also get the full CPI-W figure with no reduction. If measured inflation lands at 2.8%, the annuity rises 2.8%.³

FERS Eligibility Starts at Age 62 for Most Retirees

The FERS statute bars a COLA for any annuitant under age 62 as of the date the increase would take effect.⁴ A FERS employee who retires at 57 under MRA+10 or discontinued service rules waits five years before any inflation protection kicks in, and the annuity sits flat during that stretch.

Several FERS categories are exempt from the age 62 wait and receive COLAs immediately:⁵

Disability retirees under FERS.
Law enforcement officers, firefighters, and Capitol Police who retired under the special provisions for those roles.
Air traffic controllers retired under the special ATC provisions.
Military reserve technicians who separated because a disability ended their military membership eligibility.
Survivor annuitants, including spouses, former spouses, and insurable interest survivors.

How the Percentage Is Calculated

The adjustment comes from the Consumer Price Index for Urban Wage Earners and Clerical Workers, the CPI-W, which the Bureau of Labor Statistics publishes each month.⁶ OPM averages the CPI-W values for July, August, and September, then compares that average to the base quarter average from the most recent prior year in which a COLA was actually determined.²

That “most recent prior year in which a COLA was determined” language matters when inflation has been flat. The comparison reaches back past any year with no COLA to the last one that produced one.³ The result is rounded to the nearest tenth of a percent, and for CSRS that is the increase you receive.

The FERS Reduced Formula

FERS adjustments follow a three-tier rule tied to the same CPI-W figure:³

CPI-W increase of 2% or less: FERS retirees get the full increase.
CPI-W increase above 2% but below 3%: FERS retirees get exactly 2%.
CPI-W increase of 3% or more: FERS retirees get the CPI-W figure minus one percentage point.

The 2026 CPI-W increase is 2.8%, which sits in the middle tier. That is why CSRS gets 2.8% while FERS is capped at 2.0%.⁷ The FERS system was built on the assumption that retirees would also draw Social Security and Thrift Savings Plan balances, each with its own inflation treatment, so the reduced annuity COLA was a deliberate design choice.

Years With No COLA

Federal retirement COLAs cannot go negative. If the CPI-W drops or stays flat between the two comparison quarters, retirees receive no adjustment that year, and the annuity continues at its current level. This happened in 2010, 2011, and 2016.⁸ Nothing is clawed back, and the next positive comparison is measured against the last base quarter that actually produced an adjustment.

Proration in Your First Year

New retirees almost never see the full COLA in year one. Statute and regulation prorate the increase by how many months you were on the annuity rolls before the December 1 effective date, with any partial month counted as a full month.⁹ Each month earns one-twelfth of the announced rate.

The arithmetic: divide the COLA by 12, multiply by months on the rolls before December 1, and round to the nearest tenth.³ Take the 2026 CSRS rate of 2.8%. A retiree whose annuity started in May has seven months on the rolls by December 1, so the increase is 2.8% × 7/12, rounded to 1.6%. A November retiree gets one-twelfth, about 0.2%.

To skip proration, your annuity commencing date must be no later than December 31 of the prior year, giving you twelve full months on the rolls before the next December 1.³ Every COLA after the first is paid at the full rate.

Survivor annuities work slightly differently. If the deceased retiree was already drawing an annuity, proration keys off when that retiree’s annuity first became payable, not when the survivor benefit began.² If the retiree had been receiving full COLAs, the survivor annuity is increased by that accumulated percentage.

When the Increase Shows Up in Your Payment

The COLA takes effect December 1. Federal retirement benefits are paid in arrears, so the December benefit is issued on the first business day of January, and that January deposit is where you first see the higher amount.¹⁰

OPM usually announces the rate in late October or early November, once the September CPI-W data completes the third-quarter average. For 2026, OPM confirmed 2.8% for CSRS and 2.0% for FERS.¹

The FERS Special Retirement Supplement Is Not Adjusted

One boundary worth flagging: the FERS Special Retirement Supplement, the bridge payment approximating Social Security from your minimum retirement age until 62, does not receive COLAs.¹¹ Federal regulations exclude annuity supplements from COLA treatment.¹² The supplement is also subject to an earnings test. For 2026, the annual exempt amount is $24,480, and the supplement is reduced by $1 for every $2 earned above that.¹³ The supplement ends at 62.

Reemployed Annuitants

If you return to federal service as a reemployed annuitant, the annuity keeps running and keeps receiving COLAs. Your employing agency offsets your salary by the annuity amount, and when a COLA raises the annuity, the offset is raised to match effective the first pay period on or after the COLA date.¹⁴ A few situations break that pattern: former Members of Congress with five or more years of congressional service have the annuity suspended on reemployment, annuitants appointed as federal judges lose the annuity for the period of judicial service, and a disability retiree found recovered has the annuity terminated and returns as a regular employee.

1
U.S. Office of Personnel Management. Benefits Administration Letter 26-101 – Annual Changes
2
Office of the Law Revision Counsel. 5 USC 8340 – Cost-of-Living Adjustment of Annuities
3
U.S. Office of Personnel Management. CSRS and FERS Handbook – Chapter 2 Cost-of-Living Adjustments
4
Office of the Law Revision Counsel. 5 USC 8462 – Cost-of-Living Adjustments
5
U.S. Office of Personnel Management. Benefits Administration Letter 24-101 – Annual Changes
6
Social Security Administration. Consumer Price Index for Urban Wage Earners and Clerical Workers CPI-W
7
U.S. Office of Personnel Management. Cost of Living Adjustments
8
Congressional Research Service. Cost-of-Living Adjustments for Federal Civil Service Annuities
9
eCFR. 5 CFR 841.704 – Proration of COLAs
10
U.S. Office of Personnel Management. When Is the Cost-of-Living Adjustment COLA Paid
11
U.S. Office of Personnel Management. CSRS and FERS Handbook – Chapter 51 Retiree Annuity Supplement
12
eCFR. 5 CFR Part 841 Subpart G – Cost-of-Living Adjustments
13
Social Security Administration. Exempt Amounts Under the Earnings Test
14
U.S. Office of Personnel Management. CSRS and FERS Handbook – Chapter 100 Reemployed Annuitants