Why SSA’s COLA table is one year behind the name everyone uses
Search for the 2026 cost-of-living adjustment and you will find 2.8%. Open SSA’s actuarial table and 2.8% is filed under 2025. Neither is wrong. They are answering different questions, and almost nobody says which.
The same adjustment, two labels
2.8%
Determined in 2025, effective with benefits payable for December 2025, first reaching a payment in January 2026.
Two questions, two answers
SSA’s Office of the Chief Actuary is answering “in which year was this adjustment determined?” — a question about the computation. A beneficiary is asking “which year did my check go up?” — a question about a payment. Those were the same year until 1983 and have been one year apart ever since.
| Era | Effective with benefits for | First reaches a payment | Table year against public name |
|---|---|---|---|
| 1975–1982 | June of the same year | July of the same year | Identical |
| 1984 onward | December of the determination year | January of the following year | Public name is one year later |
SSA states the era rule verbatim
“The 1975-82 COLAs were effective with Social Security benefits payable for June in each of those years; thereafter COLAs have been effective with benefits payable for December.”
The eight adjustments a naive rule gets wrong
A site that applies “add one year to the table” uniformly misdates every adjustment before the seam. The 14.3% of 1980 — the largest on record — becomes a 1981 adjustment, which it was not.
| Year | Adjustment | Effective with benefits for | A naive +1 rule would call it |
|---|---|---|---|
| 1975 | 8.0% | June 1975 | 1976 |
| 1976 | 6.4% | June 1976 | 1977 |
| 1977 | 5.9% | June 1977 | 1978 |
| 1978 | 6.5% | June 1978 | 1979 |
| 1979 | 9.9% | June 1979 | 1980 |
| 1980 | 14.3% | June 1980 | 1981 |
| 1981 | 11.2% | June 1981 | 1982 |
| 1982 | 7.4% | June 1982 | 1983 |
1983: the seam, and the year that has no adjustment
The Social Security Amendments of 1983 moved the adjustment from June to December. Because the change was made in the year the June adjustment was due, a full calendar year passed with no increase reaching any payment. The adjustment determined in 1983 became effective with December 1983 benefits and first appeared in a January 1984 payment.
So the row labelled 1983 in SSA’s table is the 1984 adjustment under the public convention — and there is no payable 1983 adjustment at all. A naive mapping invents one. The 1983 page on this site says exactly that, and covers what SSI recipients received instead.
What this site does about it
Every record carries both keys — the determination year and the payable year — plus the month it became effective. User-facing pages use the payable year, because that is what people search for. A build gate fails if any year page renders an adjustment whose payable year does not match its address, if any record ever claims a payable year of 1983, or if a June-era page states a January payment date.
That gate exists because the draft specification for this site had the June era misdated until a review caught it. The error is easy to make, invisible once made, and fatal to a reference site.
Common questions
Is the 2.8% adjustment the "2026 COLA" or the "2025 COLA"?
Both names refer to the same adjustment. SSA's actuarial table lists it under 2025, the year it was determined. SSA's own fact sheet, the press and everyone searching for it call it the 2026 COLA, because 2026 is when it reached a payment. This site uses the 2026 convention.
Why is there no 1983 page?
Because no adjustment was payable during calendar 1983. The 1983 Amendments moved the adjustment from June to December, and the increase that would have landed in June 1983 became effective with December 1983 benefits, first paid in January 1984.
Did the older adjustments really pay in the same year?
Yes. SSA states it directly: the 1975 to 1982 adjustments were effective with benefits payable for June of each of those years. The 14.3% adjustment at row 1980 is the 1980 adjustment, reaching checks from July 1980 — not 1981.
Why does this matter beyond pedantry?
Because a table built on the wrong mapping is wrong by a year in every row, and the error is invisible: every figure is a real published figure, just attached to the wrong year. It is the single easiest way to destroy the credibility of a reference site.
Related
- Every adjustmentby payable year
- 1983the year with none
- The base quarterthe other trap
- Methodologythree regimes
- 1980the largest ever
- 1984the first of the new era
Sources and freshness
- SSA Office of the Chief Actuary — Cost-of-Living Adjustments — verified 10 August 2026
- SSA Office of the Chief Actuary — Latest cost-of-living adjustment — verified 10 August 2026
- SSA — 2026 COLA fact sheet — verified 10 August 2026
Page figures last verified against the sources above on 10 August 2026. Corrections: the correction log · support@inventum.com.au