Retirees under the Federal Employees Retirement System do not get the full inflation rate once prices climb past a statutory line. Under Title 5 of the U.S. Code, when the measured price change exceeds 3 percent, the annuity increase is that change less one full percentage point, the arrangement federal retirees call the “diet COLA.” The 2027 adjustment cannot be known yet: the September inflation report is scheduled for October 14, and nothing in the formula can be applied until it publishes, as set out in 5 U.S.C. 8462.
How the 3 percent line splits the FERS formula
Section 8462(b) sets three regimes. When the percent change in the price index does not exceed 3 percent, the annuity rises by the lesser of that change, rounded to the nearest tenth of a percent, or 2 percent. When it exceeds 3 percent, the increase is “the excess of” the percent change “over” 1 percent. Adjustments take effect December 1 of any year in which one is made.
Put as arithmetic, the rule works like this. A measured change of 1.4 percent produces a 1.4 percent increase. A change of 2.5 percent, or exactly 3.0 percent, produces 2.0 percent, because the cap binds. A change of 3.4 percent produces 2.4 percent, and a change of 4.2 percent produces 3.2 percent. These are illustrations of the statute, not predictions for 2027. The result is a flat 2 percent for everything between 2 and 3 percent, followed by a step: the increase falls from 2.0 percent at a 3.0 percent reading to 2.1 percent at 3.1, then tracks inflation minus one point from there.
So what are FERS annuitants getting for 2027? Nothing is fixed yet, and the answer depends on which of the three regimes the quarter’s index lands in. Retirees who have drawn an annuity for a full year and are 62 or older fall under the formula directly. Those who are younger, or who retired recently, need to check two exceptions covered below.
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The quarter average, not a single month, drives the percentage
The statute does not look at September alone. It defines the base quarter as “the calendar quarter ending on September 30,” and the price index for that quarter as “the arithmetical mean of such index for the 3 months comprising such quarter.” The percent change compares that July-through-September average with the same figure from the preceding year in which an adjustment was made, divides the difference by the earlier figure, and multiplies by 100.
That is why October 14 matters. The September reading is the last of the three monthly values, and the quarter’s average cannot be completed until it is out. The Bureau of Labor Statistics’ schedule lists the row as “September 2026 | Oct. 14, 2026 | 08:30 AM.” Before that time, any 2027 figure quoted for FERS is an estimate. The Social Security Administration’s COLA series likewise carries no 2027 entry, so there is no published number to compare against.
The under-62 rule and the first-year proration
The percentage is only half of the question. Section 8462(c)(3) provides that the adjustment is not effective for an annuitant who is under 62 years of age. The statute carves out exceptions, covering annuitants under sections 8412(d)(1), 8412(e) and 8414(c), the last being the disability retirement of a military reserve technician. Each is a separate provision and a retiree whose age or retirement category is unclear should confirm which applies before assuming a December 1 increase.
For newer retirees, subsection (c) also provides that an initial increase equals one-twelfth of the applicable percent change multiplied by the number of months, not more than 12, since the annuity began. A person who retired in the summer of 2026 therefore receives only a fraction of whatever percentage emerges, not the full figure.
The statute was amended in 2022 by Public Law 117-225, which changed a cross-reference in subsection (c)(3)(B)(ii). The one-point subtraction itself is untouched, and it remains the standing rule on the books today.
Reading the October 14 release against the FERS formula
The free official route is the Bureau of Labor Statistics itself. The CPI release schedule confirms the release date and time, and the release carries the September index on the day. Annuitants who want to anticipate the result can do so with the monthly values for July, August and September, since the statute averages the three.
What to compare is the third-quarter average against the prior comparison quarter, not the headline year-over-year number alone. Then place the result in the statute’s three regimes: below 2 percent the increase tracks the index, from 2 to 3 percent it is capped at 2, and above 3 percent it is the index change minus one point. A reading just over the line produces an increase barely above the cap, which is the part of the formula that surprises people most.
The watch-out is timing. Any projected FERS increase published before the release is a calculation, not a determination, and the statute’s December 1 effective date means the real figure arrives only after the index does.
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This article was produced with AI assistance and reviewed by The Financial Wire’s editorial team.
David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
