Last updated: September 2026. Techeconomix Editorial Team — researched using primary reporting from CNBC, CBS News, AARP, and the Senior Citizens League. See “Sources & Methodology” at the end of this article.
Quick answer: Early estimates put the 2027 Social Security cost-of-living adjustment (COLA) at 3.5% to 3.6%, based on July 2026 inflation data — down from earlier-year forecasts as high as 4.7%, but still on track to be the largest annual increase since 2023. The official figure won’t be announced until October 14, 2026, after the Social Security Administration factors in August and September inflation data. Here’s what the estimates show, how the COLA is actually calculated, and what it would mean for your monthly check.
The Latest Estimates
Two independent trackers published new 2027 COLA estimates on the same day in mid-August 2026, both based on the July Consumer Price Index release. The Senior Citizens League, a nonpartisan advocacy group for older Americans, now projects a 3.6% COLA, down from its earlier forecast of 3.8% in June and July. AARP separately projects 3.5%, a slight decrease from its earlier estimate of 3.6%. Independent policy analyst Mary Johnson has also revised her estimate downward twice this year — from 4.7% in June to 3.7% in July.
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How the COLA Is Actually Calculated
The Social Security COLA isn’t based on the headline inflation figure most people see in the news. It’s calculated using the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W), a narrower measure than the more commonly cited CPI-U. Specifically, the Social Security Administration averages the CPI-W over the third quarter of the calendar year — July, August, and September — and compares it to the same three months of the prior year. The July report is the first of three data points that actually count toward the official calculation; the June figure only helped analysts estimate where things were heading.
That means two more inflation reports, covering August and September, will determine the final number. If inflation accelerates in the coming months, the COLA could end up higher than current estimates. If it continues cooling, the final figure could come in lower still.
What a 3.5%–3.6% Increase Means in Dollars
The average retired worker received $2,071 a month in Social Security benefits as of January 2026, according to the Social Security Administration. A 3.6% COLA would raise that to roughly $2,146 a month starting in January 2027 — an increase of about $75. AARP’s slightly lower 3.5% estimate translates to about a $73 monthly increase. For context, the 2026 COLA that took effect in January was set at 2.8%, and the ten-year average COLA has been 3.1%, according to Social Security Administration data. A 3.5% to 3.6% adjustment would be the largest since 2023, when high inflation drove an 8.7% increase.
Why the Increase Feels Smaller Than It Looks
There’s a structural reason retirees often feel like they’re falling behind even with a COLA increase: Medicare Part B premiums are typically deducted directly from Social Security checks, and rising healthcare costs regularly eat into a meaningful share of the annual adjustment. Longer-term projections suggest this dynamic will intensify — the standard monthly Medicare Part B premium could reach $360.60 by 2035, according to Kiplinger’s analysis, a 77.7% increase from the 2026 premium of $202.90.
There’s also a timing mismatch built into how COLAs work. Because the adjustment is based on inflation that already happened, rather than inflation expected in the coming year, retirees effectively spend the following twelve months catching up to price increases that occurred before their raise took effect — a lag that can leave seniors feeling like they’re losing ground even in years with an above-average COLA.
What to Watch Before October 14
Energy prices are one of the biggest wildcards remaining in the calculation. As of early August 2026, oil prices were running roughly 24% higher than the same time the previous year, according to tracking from myfederalretirement.com. Because fuel costs ripple through the price of producing and transporting nearly everything in the CPI-W basket, a sustained rise at the pump through August and September could push the final COLA above current estimates.
Frequently Asked Questions
What is the estimated 2027 Social Security COLA?
Current estimates range from 3.5% (AARP) to 3.6% (Senior Citizens League), based on July 2026 inflation data. The official figure will be announced October 14, 2026.
How is the Social Security COLA calculated?
It’s based on the average year-over-year change in the CPI-W (Consumer Price Index for Urban Wage Earners and Clerical Workers) during July, August, and September, compared to the same months the prior year.
How much will my Social Security check increase in 2027?
Based on current estimates, the average retired worker’s benefit would rise by roughly $73 to $75 per month, from about $2,071 to somewhere between $2,144 and $2,146.
When will the official 2027 COLA be announced?
The Social Security Administration will announce the official 2027 COLA on October 14, 2026, after September’s inflation data is released.
Sources & Methodology
This article draws on reporting from: CNBC’s coverage of the August 2026 COLA estimates from the Senior Citizens League, AARP, and independent analyst Mary Johnson; CBS News’s analysis of the 2027 COLA forecast; AARP’s official COLA estimate and methodology; the Senior Citizens League’s COLA Watch tracker; and Kiplinger’s analysis of projected Medicare Part B premium increases. Figures reflect the most recently published estimates as of this article’s last-updated date and will be superseded by the Social Security Administration’s official announcement on October 14, 2026.
This article is for informational purposes and does not constitute financial or retirement planning advice. Consult the Social Security Administration or a licensed financial advisor for guidance specific to your benefits.
