Before the October 2026 cost-of-living adjustment, or COLA, announcement, treat every published 2027 percentage as an estimate. The official rate depends on September inflation data, while your official notice will show your personal benefit amount. Forecasts can help with preliminary budgeting, but they cannot confirm what Social Security will deposit. Keep estimates, the official COLA percentage, and your personalized notice separate.
Official resource:
- https://www.bls.gov/schedule/news_release/cpi.htm — Use this primary source to review the underlying data.
Table of Contents
- Why current COLA figures are estimates
- What the forecasts actually show
- Who receives the official adjustment
- Why the percentage is not your payment amount
- Medicare can change the net increase
Why current COLA figures are estimates
The Social Security Administration calculates the 2027 COLA by comparing the average Consumer Price Index for Urban Wage Earners and Clerical Workers, or CPI-W, for July through September 2026 with the 2025 third-quarter average. It then rounds any increase to the nearest one-tenth of a percentage point, according to the SSA's COLA calculation guidance.
September completes the three-month average. The Bureau of Labor Statistics plans to release September 2026 CPI data at 8:30 a.m. Eastern on October 14, so percentages published earlier cannot be final under the formula described by SSA, according to the BLS release schedule.
What the forecasts actually show
After August inflation data, The Senior Citizens League estimated a 3.5% COLA. That was lower than its previous 3.6% forecast, showing how an estimate can move when another month of data becomes available. AARP separately projected 3.6%.
It estimated that percentage would add about $75 a month to July's $2,086 average retired-worker benefit, while identifying the calculation as a forecast based on projected September inflation. Those examples are planning illustrations, not competing official decisions. A forecast can approximate the national adjustment, but it does not establish either the final percentage or anyone's personal payment.
Who receives the official adjustment
The official COLA applies to Social Security retirement, survivor, and disability benefits, as well as federal Supplemental Security Income payments. Social Security increases apply to December benefits that are generally paid in January.
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January SSI is normally paid at the end of December because January 1 is a holiday. Recipients should distinguish that early payment date from an extra monthly benefit.
Why the percentage is not your payment amount
A COLA percentage applies to each recipient's own starting benefit. Individual awards and deductions differ, so multiplying a published average benefit by a forecast will not reveal an exact deposit.
SSA generally places personalized COLA notices in eligible beneficiaries' my Social Security Message Centers in early December. It mails paper notices throughout December, making the personalized SSA notice the practical source for a recipient's new amount. Use the figures in this order:.
- Before October 14: treat percentages as forecasts.
- After the official calculation: use the announced COLA for general planning.
- In December: use your SSA notice for your personalized benefit amount.
- When the payment arrives: compare the deposit with the notice and applicable deductions.
Medicare can change the net increase
The Social Security COLA and Medicare Part B premium are separate calculations. A higher Part B premium can reduce the increase that a beneficiary sees in a net Social Security payment.
The 2026 Medicare Trustees projected a $209.50 standard Part B premium for 2027. However, the report said financing rates had been set only through December 2026, so that projection was not the final 2027 charge, according to the 2026 Medicare Trustees report.
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