If you get a Social Security check, or you’re helping a parent manage one, there’s a number worth circling on your calendar right now: October 14, 2026. That’s when the Social Security Administration is expected to announce the official cost of living adjustment for 2027 the raise that shows up in your check starting in January.
Here’s what we know about the estimate so far, how the number actually gets calculated, and why it matters well beyond the headline percentage.
The Current Estimate: Around 3.5%–3.6%#
Two of the most closely watched independent forecasters have landed close together. AARP is projecting a 3.6% increase, while the Senior Citizens League estimates 3.5%. Either number would mark the largest COLA since 2023, and a meaningful jump from the smaller adjustments retirees have seen the past couple of years.
In dollar terms, a 3.6% bump would take the average retired worker’s monthly benefit from roughly $2,071 up to about $2,146 an increase of around $75 a month, or close to $900 over the year. Not enormous, but not nothing either, especially for anyone living primarily on that check.
Worth being clear about: these are estimates, not the final number. The official figure isn’t locked in until the Bureau of Labor Statistics releases September’s inflation data, which is what triggers the SSA’s formal announcement.
How the COLA Actually Gets Calculated#
This part trips a lot of people up, so it’s worth walking through plainly. The Social Security COLA isn’t based on general inflation over the whole year, and it isn’t set by any committee’s judgment call. It’s a formula, applied to a specific slice of data:
The SSA compares the average CPI -W (Consumer Price Index for Urban Wage Earners and Clerical Workers) for July, August, and September of the current year against the same three month average from the prior year. Whatever percentage that index rose by becomes the COLA, rounded to the nearest tenth of a percent.
That’s it three months of data, one specific inflation index, a straightforward year over year comparison. It doesn’t account for what happened in January through June, and it doesn’t use the more commonly cited CPIU (the index most news headlines reference for “inflation”). CPIW tends to weight things like transportation and food a bit differently, which is part of why the COLA number can feel disconnected from your own sense of how prices have moved that year.
This is also why the estimates firm up as the year goes on by August, two of the three required months of data are already in, which is how AARP and the Senior Citizens League can publish increasingly confident projections before the SSA’s official announcement in October.
Why October 14 Specifically#
The COLA can’t be calculated, let alone announced, until the September CPI report is published since September is the third and final month in the formula. That report is scheduled for release on October 14, 2026, and the Social Security Administration typically announces the COLA the same day or within hours of the data dropping.
It’s worth knowing this date has moved around in past years the 2026 COLA announcement, for instance, was delayed to October 24 because of a government shutdown that pushed back the BLS’s data release. If something similar happens this year, the announcement date could shift, but the underlying math stays the same either way.
Once announced, the new COLA takes effect with the payment beneficiaries receive in January 2027.
The Part Nobody Talks About: Medicare Part B#
Here’s the thing that catches a lot of retirees off guard every single year: your COLA increase and your Medicare Part B premium are announced separately, and Part B premiums are typically deducted directly from your Social Security check.
If your Part B premium goes up by a similar amount to your COLA increase, your net raise the actual extra money that lands in your account can end up much smaller than the headline percentage suggests. In some past years, retirees have seen COLA increases almost entirely offset by rising Medicare premiums, which is a big part of why advocacy groups argue the COLA formula doesn’t fully reflect the cost pressures seniors actually face, particularly in healthcare.
Medicare typically announces its Part B premium changes for the following year in November, after the COLA is already set. So the responsible way to think about your 2027 raise is: take the COLA percentage as a starting point, then wait for the Part B premium announcement before assuming you know your real increase in take home benefits.
What to Actually Do Between Now and the Announcement#
- Don’t budget around the estimate as if it’s final. 3.5%–3.6% is a well informed guess, not the number. Wait for the October 14 announcement before locking in any spending plans tied to it.
- Watch for the Medicare Part B announcement in November that’s the number that determines what you actually keep.
- If you’re still working and claiming benefits early, remember the COLA applies to your benefit amount regardless of when you claimed, so this affects you the same way it affects someone who waited until full retirement age.
- Set a reminder for October 14. The SSA typically posts the new COLA on its website (ssa.gov) the same day it’s announced, along with updated maximum taxable earnings and other program figures for the following year.
The Bottom Line#
The 2027 COLA is shaping up to be the largest in a few years, driven by inflation that’s stayed stickier than policymakers would like. But the headline percentage is only half the picture the real number that matters is what’s left after Medicare Part B takes its share. Mark October 14 for the official COLA, and keep an eye out in November for the number that actually decides how much bigger your check gets.