Most retirees will learn their 2027 cost-of-living adjustment (COLA) at the same moment Wall Street learns September inflation. The government’s September Consumer Price Index is scheduled for 8:30 a.m. ET on Wednesday, October 14, and, according to the Senior Citizens League and the retiree group AMAC, the Social Security COLA is announced alongside it.
The headline number will probably land near 3.5%. The number that decides how much more cash actually arrives each month is a smaller one, and it sits on a different line of the benefit statement.
What the estimates say
The Senior Citizens League (TSCL), an advocacy group, projects a 3.5% COLA for 2027. That is down a tenth of a point from its July estimate of 3.6%, according to Kiplinger’s September 30 update. Kiplinger’s own staff economist projects 3.6%, and the same article lists AARP at 3.6% and FEDweek at 3.5%.
These are forecasts, not government figures. The official number comes from the Social Security Administration after the Bureau of Labor Statistics publishes September data.
For context, the 2026 COLA was 2.8%, paid starting in January, per AMAC.
How the math works
The COLA does not use the CPI number that makes headlines. It uses a related index called the CPI-W, which tracks prices paid by urban wage earners and clerical workers.
The formula compares the average CPI-W for July, August and September of this year with the same three months of last year, then rounds to the nearest tenth of a percent. AMAC reports that the third-quarter 2025 average was 317.265. It also reports July 2026 at 327.104 and August 2026 at 328.481.
Only September is missing. AMAC says September needs to come in at about 329.05 for a full 3.5%. If September simply matches August, the COLA would round to 3.4%, AMAC says. The Jolt Journal’s own arithmetic from those inputs agrees: a September reading near 330.0 would be needed to reach 3.6%, while anything between roughly 328.1 and 329.0 produces 3.4%.
That makes the outcome unusually easy to track. One month of data moves the final number by a tenth or two.
One caution on timing. Schwab’s market update on October 12 says economists expect the headline CPI to rise 0.6% month over month, with core CPI up 0.2%. That is the broader CPI, not the CPI-W, so it is a rough guide to direction rather than a precise forecast of the COLA.
What could move September
Energy is the wild card. Schwab’s October 12 update reported West Texas Intermediate crude at $93.75 a barrel, up 2.1% on the day after weekend violence in the Middle East and Russian attacks on Ukraine’s energy infrastructure. Brent had slipped below $100 in early October after a weak jobs report, according to Trading Economics, so fuel costs have been choppy rather than steadily rising.
Schwab also noted that the University of Michigan’s preliminary October consumer sentiment reading fell to 46.3 from 48.1 in September. Households are feeling squeezed, and a rising COLA does not change that feeling on its own.
What it means in dollars
Kiplinger puts the average monthly retired-worker benefit at $2,087.52 as of August 2026. At a 3.5% increase, that is about $73.06 more per month, bringing the average to roughly $2,160.58. AMAC uses a slightly different starting average of $2,085.98 and gets $73.01. The gap is small, but it is a reminder that “the average” depends on which month’s data you use.
For a couple both collecting, or for someone with a higher-than-average benefit, the dollar amount scales up. For someone with a smaller benefit, it scales down. The percentage is the same for everyone.
The Medicare line
Most beneficiaries have their Medicare Part B premium deducted straight from their Social Security payment, so any increase in that premium reduces the raise.
Kiplinger cites a projected 2027 standard Part B premium of $209.50, up from $202.90 in 2026. That is a $6.60 increase. Subtracting it from the projected $73.06 raise leaves about $66.46 more per month for a typical retiree, by this publication’s arithmetic.
Two caveats apply. The Part B figure is a projection in the source we read, not a final announcement, and the sources we reviewed did not say when the official amount will be confirmed. Some beneficiaries pay Part B differently, and higher-income households can owe income-related surcharges. Your own Social Security notice, when it arrives, is the figure that counts.
Kiplinger’s article also points to the longer horizon. It cites the 2026 Medicare Trustees Report projecting the standard premium could reach $360.60 by 2035, a 77.7% increase over the 2026 level. If that holds, the premium would consume a growing share of each year’s raise.
Why the raise can still feel small
A COLA is backward-looking. It measures what prices did over a year, then applies the result to the next one. When inflation is volatile, as the CPI-W data suggest this year, the adjustment can lag what retirees feel at the register.
Kiplinger’s table shows CPI-W inflation running at 2.2% in January and February, then jumping to 3.3% in March, 3.8% in April and 4.4% in May, before easing to 3.5% in June, 3.4% in July and 3.5% in August. A raise built from the July-through-September average smooths that ride, which helps when prices fall back and hurts when costs spike mid-year.
What to do before Wednesday
There is little to do about the COLA itself, but a few steps are worth taking now.
- Find your current benefit amount in your online Social Security account so you can compare it with the new notice.
- Look for the Part B line when the notice arrives. The net change, not the gross percentage, is your real raise.
- Revisit your budget around the date the new amount begins, which is January for the 2027 adjustment.
Treat the first number you see in the news as the starting point, then wait for the notice with your own figure.
Editor’s take
The COLA headline is the least useful number in Wednesday’s inflation news. What a retiree takes home depends on the Medicare premium that gets subtracted from it, and the projections above show it rising. Watch the Part B line, not the COLA percentage, and build your 2027 budget from the net figure. This is a judgment call based on the projections above, not financial advice.
