About 75 million Americans currently collect a Social Security or Supplemental Security Income payment, and every one of them is waiting on a single number the government has not yet confirmed. The Social Security Administration will announce the official 2027 cost-of-living adjustment on October 14, and until then, any percentage in circulation — including the 3.6 percent figure making headlines this week — is an outside estimate, not the raise itself. For a household living on a fixed monthly check, the gap between an estimate and the real number can be the difference between budgeting confidently for next year’s rent and Medicare premium or guessing.
The CPI-W Formula Behind the October 14 Date
The Social Security Administration does not set the COLA by opinion or negotiation. By law, it is calculated from the Consumer Price Index for Urban Wage Earners and Clerical Workers, or CPI-W, a measure the Bureau of Labor Statistics publishes monthly. The formula compares the average CPI-W for July, August and September of this year against the same three months last year. Because the Bureau of Labor Statistics has not yet released August or September data, two of the three months that will decide the 2027 number have not been measured.
That data gap is exactly why the agency, which uses the CPI-W as its sole official yardstick, is not expected to confirm the 2027 COLA until October 14, according to The Senior Citizens League, a nonpartisan advocacy group that tracks the calculation monthly. It’s the same sequence SSA followed for the current 2026 COLA: the 2.8 percent increase reached nearly 71 million Social Security beneficiaries starting in January, with roughly 7.5 million Supplemental Security Income recipients seeing their raise a few weeks earlier, in late December.
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The Senior Citizens League’s 3.6 Percent Estimate
The 3.6 percent figure comes from The Senior Citizens League’s statistical model, which the group updates monthly using CPI data, the Federal Reserve’s benchmark interest rate and the national unemployment rate. In its August 12 release, TSCL said the model now points to a 3.6 percent adjustment for 2027, 0.8 percentage points above the current 2.8 percent COLA. If that estimate held exactly, TSCL calculated the average monthly Social Security benefit would rise from $1,937.53 to $2,007.28, an increase of $69.75 a month. TSCL’s own release is careful about the distinction this article is built around: “Frankly, it’s infuriating that seniors must wait,” TSCL Executive Director Shannon Benton said of the delay, while stressing the number itself still belongs to the Social Security Administration, not to TSCL’s model.
Why the Estimates Keep Slipping
TSCL’s own tracker shows real movement over the summer. The group’s projection ran as high as 3.8 percent earlier this year before cooling price growth pulled it down to 3.6 percent by mid-August. AARP’s separate research model has moved the same direction, now forecasting a 3.5 percent COLA for 2027, down from an earlier AARP estimate that also sat at 3.6 percent. Both organizations point to the same driver: the CPI-W’s year-over-year change came in at 3.4 percent in July, a touch below what either model had penciled in for the full third-quarter average. TSCL described the underlying inflation path as unusually jumpy this year, starting near 2.2 percent in January, spiking to 4.4 percent in May, then settling back to 3.5 percent in June — volatility that makes any single-month estimate a moving target. Neither group controls the outcome; both are forecasting a government calculation that will not be finalized until the Bureau of Labor Statistics reports full third-quarter data in mid-October.
What the Range Means for a Fixed Monthly Budget
For a household budgeting around a Social Security check, the practical takeaway isn’t the exact decimal point — it’s the range and its history. Current estimates cluster between 3.5 and 3.6 percent, above this year’s 2.8 percent adjustment, the 2.5 percent COLA paid in 2025, and the 3.2 percent COLA paid in 2024, according to the Social Security Administration’s own published COLA history. If either estimate holds, 2027 would mark the largest annual increase in four years, trailing only the 8.7 percent adjustment triggered by 2023’s post-pandemic inflation spike. Zoom out further and the stakes of getting the estimate right become clearer: TSCL’s own long-run tracking shows COLAs averaged only about 1.4 percent a year from 2010 through 2019, then jumped to an average of roughly 3.7 percent a year from 2020 through 2025 as post-pandemic inflation took hold — meaning a household’s fixed check has had to absorb bigger annual swings in this decade than in the one before it. But the number that actually lands in a bank account each January still depends on data the Bureau of Labor Statistics has not collected yet. Households penciling in 2027 rent, Medicare premiums or utility budgets should treat 3.6 percent as a planning range, not a locked-in raise, until the Social Security Administration’s October 14 announcement replaces every estimate on this page with the one number that counts.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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