Guide · Social Security
The 2027 Social Security COLA, explained
Every autumn, Social Security raises benefits to keep up with the cost of living. This guide walks you through what that cost-of-living adjustment (COLA) really is, how it's worked out, what recent years looked like, and why the raise that lands in your bank account can feel smaller than the headline number. Plain language, no jargon.
Early estimate: 2027 COLA ≈ 3.6% Official figure announced October 14, 2026.
What the COLA is, and why it exists
A cost-of-living adjustment, or COLA, is the yearly raise Social Security adds to your benefit so that rising prices don't quietly shrink what your check can buy. If groceries, gas, and rent all cost more this year than last, a fixed benefit would stretch less far each month. The COLA is designed to offset that.
Congress built automatic COLAs into Social Security back in 1975. Before then, it took an act of Congress to raise benefits, and increases often lagged years behind inflation. Now the adjustment happens on a set schedule, tied to a government measure of prices — no vote required. The goal is simple: protect the buying power of the benefit you've already earned.
The raise takes effect with your January payment, and it's permanent. Each year's COLA is added on top of the benefit you're already receiving, so the increases compound over time.
How the COLA is calculated
The COLA isn't a guess or a political decision. It comes from a formula written into law, based on one specific inflation gauge:
- The index used is CPI-W — the Consumer Price Index for Urban Wage Earners and Clerical Workers, published by the U.S. Bureau of Labor Statistics. This is a different, older index than the CPI-U figure you often hear quoted in the news.
- Only the third quarter counts. The formula looks at the average CPI-W for July, August, and September — the third quarter of the year.
- It's a year-over-year comparison. That Jul–Aug–Sep average is compared with the same quarter of the last year a COLA took effect. The percentage increase between the two is the COLA.
- It's rounded to the nearest tenth of a percent (0.1%).
In plain terms: prices are averaged across three late-summer months, this year's average is stacked against last year's, and the percentage jump becomes your raise.
A worked example (the confirmed 2026 figure)
Here's how the 2026 COLA of 2.8% was actually produced. The third-quarter CPI-W average rose from one year to the next, and the percentage change — rounded to a tenth — is the raise.
| Step | Value |
|---|---|
| Average CPI-W for Jul–Aug–Sep 2024 | 308.729 |
| Average CPI-W for Jul–Aug–Sep 2025 | 317.373 |
| Increase (317.373 − 308.729) | 8.644 |
| Percentage change (8.644 ÷ 308.729) | 2.80% |
| Rounded to the nearest 0.1% | 2.8% |
Source: U.S. Bureau of Labor Statistics CPI-W (series CWUR0000SA0) and the Social Security Administration. The 2026 COLA of 2.8% was announced on October 24, 2025 — a little later than usual because of the federal government shutdown that fall.
A short history of recent COLAs
Because the COLA follows inflation, it swings from year to year. The big 2023 increase reflected the high inflation of 2022; the smaller, calmer numbers since then track prices settling down.
| Year the raise took effect | COLA | Status |
|---|---|---|
| 2023 | 8.7% | Confirmed |
| 2024 | 3.2% | Confirmed |
| 2025 | 2.5% | Confirmed |
| 2026 | 2.8% | Confirmed |
| 2027 | 3.6% | Estimate only |
Here is how recent COLAs compare at a glance, with the 2027 bar shown as an estimate:
| Item | COLA |
|---|---|
| 2023 | 8.7% |
| 2024 | 3.2% |
| 2025 | 2.5% |
| 2026 | 2.8% |
| 2027 | 3.6% |
The 2027 figure of 3.6% is an early estimate from analysts such as The Senior Citizens League and AARP — not the official number. It's based on inflation data collected before the third-quarter measuring window is even complete, so treat it as a well-informed forecast that can still move. The official 2027 COLA is announced on October 14, 2026 at 8:30 a.m. ET, right after the BLS releases September CPI-W.
Why your raise feels smaller than the headline
Here's the part that surprises many people. A 3.6% COLA on a benefit of about $2,032 — roughly the average retired-worker check after the 2026 raise — adds around $73 a month before anything is taken out. But that's not usually the amount your deposit grows by.
For most retirees, the Medicare Part B premium is deducted straight from the Social Security payment. When Part B goes up — and it often does — the increase eats into your COLA. Your gross benefit rises by the full percentage, but the number that actually lands in your bank account grows by less. In some years, a higher Part B premium has swallowed a large share of the raise.
The two numbers to keep separate
Your gross raise is your benefit times the COLA. Your net raise is what's left after Part B is withheld. The gap between them is why a "2.8% raise" can feel like less. We break this down in detail in Part B premiums and your COLA.
None of this means the COLA isn't real — it is, and it's permanent. It just means the headline percentage and the change to your deposit are two different figures worth looking at side by side.
See what it means for your own check
The clearest way to understand the COLA is to run your own numbers. Our calculator applies the COLA to your benefit and then subtracts Part B, so you see both the gross raise and the amount you actually keep. Nothing you type ever leaves your device.
Estimate your own raise
Enter your benefit, pick a COLA, and see your 2027 increase before and after Medicare Part B.
Open the COLA calculator →Key dates for this fall
The 2027 COLA is announced October 14, 2026. Medicare enrollment runs Oct 15 – Dec 7.
See the timeline →Frequently asked questions
Is the 2027 COLA of 3.6% official?
No. The 3.6% figure is an early estimate from independent analysts like The Senior Citizens League and AARP, based on inflation data gathered before the measuring period is finished. The official 2027 COLA is announced by the Social Security Administration on October 14, 2026 at 8:30 a.m. ET, and it can differ from the estimate.
Which inflation index does the COLA use?
It uses CPI-W — the Consumer Price Index for Urban Wage Earners and Clerical Workers — not the more commonly quoted CPI-U. Specifically, it compares the average CPI-W for July, August, and September against the same quarter of the last year a COLA took effect, rounded to the nearest tenth of a percent. You can review the raw index on the BLS Consumer Price Index page.
When does the raise actually start?
The COLA takes effect with your January payment and is permanent. Each year's adjustment is added on top of the benefit you already receive, so increases build on one another over time.
Why did my deposit go up by less than the COLA percentage?
Because Medicare Part B is usually withheld from your Social Security check. Your gross benefit rises by the full COLA, but if the Part B premium also increases, the change to your actual deposit is smaller. Our COLA calculator shows both figures side by side.
Where do these numbers come from?
Everything here comes from public government sources: the Bureau of Labor Statistics for CPI-W and the Social Security Administration for the COLA. BenefitDial is independent — we take no commissions, sell no data, and never ask for your phone number. Read how it works.