

Understanding Cost-of-Living Adjustments (COLAs) – Part I – How COLAs Work for CSRS and CSRS-Offset
Federal employees are eligible to receive annual government-wide pay increases and locality pay adjustment increases each year. The government-wide pay increase each year is set by the President and if Congress takes no action, the pay increase will go into effect on the first day of the new leave year.
Federal annuitants and survivor annuitants receive cost-of-living adjustments (COLAs). COLAs are set by law. This is the first of two FEDZONE columns discussing the calculation of COLAs for federal annuitants and survivor annuitants. The COLA amount can differ depending on whether an annuitant is a CSRS or FERS annuitant or survivor annuitant. This column discusses CSRS COLAs.
Before explaining the calculation of the CSRS COLA, a definition of terms is necessary and presented here:
The amount of a CSRS COLA is determined by the prevent change in the base quarter index from the previous year to the year in which the COLA is to be put into effect, adjusted by the nearest 1/10 of 1 percent. The following example illustrates:
| Year | Base Quarter Price Index |
| 2023
2022 Difference |
306.0
(296.4) 9.6 |
9.6/296.4 x 100 =3.24
CSRS COLA Rate = 3.2% (adjusted to the nearest 1/10 of 1 percent) effective December 1, 2023.
A CSRS or CSRS Offset annuitant’s new gross monthly annuity, reflecting the COLA increase, is calculated by multiplying the old gross monthly annuity by the COLA factor (1 plus the COLA rate):
New gross monthly CSRS annuity = Previous gross monthly CSRS annuity x (1+ COLA rate)
The following example illustrates:
Example 1. Frank is a CSRS annuitant. During 2023, Frank’s gross monthly annuity was $6,250. The 2024 CSRS COLA is 3.2 percent.
Effective January 1, 2024, Frank’s CSRS gross monthly annuity equals:
$6,250 x (1+.032) = $6,250 x 1.032 = $6,450.
The new gross monthly annuity is the annuity payable as a result of the COLA adjustment and after the following adjustments, when applicable, have been made:
The following example illustrates:
Example 2. Same facts as in Example 1 except that Frank’s CSRS annuity is reduced for the cost of a spousal survivor annuity ($540 per month), an unpaid deposit service performance before October 1, 1982 ($100 per month) and a reduction of $250 per month because of a redeposit for service ending prior to March 1, 1991.
Frank’s 2024 CSRS monthly annuity, starting January 1,2024 is:
$6,450 less $540 less $100 less $250 = $5,560.
The following should be noted:
The amount of a CSRS annuitant’s first COLA is prorated. The proration is based on the number of months from the annuity commencement date to the effective date of the first COLA after the commencement date.
In particular, retirees receive one-twelfth of the applicable COLA for each month (not to exceed 12 months) that they are in receipt of an annuity before December 1st of the first year of retirement. In order to receive the full December 1st increase, a retiree’s commencing date for retirement can be no later than December 31 of the previous year.
From the chart below, a first year CSRS or CSRS Offset annuitant will determine the number of months he or she is on the annuity rolls at the time of the COLA. The COLA rate is divided by 12 and multiplied by the number of months on the annuity roll. The result is rounded to the nearest 1/10 of one percent, equaling the prorated COLA.
| If CSRS Monthly Annuity Commences During – | Number of Months on Annuity Roll |
| December of previous year
January February March April May June July August September October November |
12
11 10 9 8 7 6 5 4 3 2 1 |
The following example illustrates:
Example 3. Laura, a CSRS annuitant, retired from federal service on July 30, 2023. The 2024 COLA is 3.2 percent.
Laura’s CSRS annuity commencement date: August 1, 2023
Number of months during 2023 on annuity roll: 4
4/12 x 3.2% = 1.1%
Laura’s 2023 gross CSRS monthly annuity before 2024 COLA = $3,600
Gross monthly annuity after COLA (effective with the first annuity check in 2024 dated January 1, 2024):
$3,600 x (1 + .01) = $3,882
It is important to note that proration applies only to a CSRS or CSRS Offset annuitant’s first year COLA.
A CSRS survivor annuity is payable to one individual – a spouse, a former spouse, or to an insurable interest. The CSRS survivor annuity commences on the day after the death of the CSRS annuitant.
The following are the rules for a CSRS survivor annuitant’s first year COLA:
The following two examples illustrate the three rules listed above.
| If employee retires… | Then dies … | Survivor annuity COLA is ….. | |
| Example 1 | June 1 | July 14 | Subject to proration |
| Example 2 | June 1 | January 10 | Not subject to proration (the deceased annuitant received prorated increase effective December 1 following commencement of annuity on June 2). |
The following two miscellaneous provisions with regard to CSRS COLAs:
Edward A. Zurndorfer is a CERTIFIED FINANCIAL PLANNER™ professional, Chartered Life Underwriter, Chartered Financial Consultant, Chartered Federal Employee Benefits Consultant, Certified Employees Benefits Specialist and IRS Enrolled Agent in Silver Spring, MD. Tax planning, Federal employee benefits, retirement and insurance consulting services offered through EZ Accounting and Financial Services, and EZ Federal Benefits Seminars, located at 833 Bromley Street – Suite A, Silver Spring, MD 20902-3019 and telephone number 301-681-1652. Raymond James is not affiliated with and does not endorse the opinions or services of Edward A. Zurndorfer or EZ Accounting and Financial Services. The information has been obtained from sources considered to be reliable, but we do not guarantee that the foregoing material is accurate or complete. While we are familiar with the tax provisions of the issues presented herein, as Financial Advisors of RJFS, we are not qualified to render advice on tax or legal matters. You should discuss tax or legal matters with the appropriate professional.
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