- The 2027 COLA is currently estimated at 3.5% (The Senior Citizens League, September 2026) to 3.6% (AARP) โ well above 2026's 2.8% increase.
- The official number arrives October 14, 2026, calculated from Q3 (July-September) CPI-W inflation data.
- On the average retirement benefit of about $2,086/month, a 3.5%-3.6% COLA works out to roughly $73-$75 more per month ($876-$900/year).
- Medicare Part B premiums are projected to rise from $202.90 to about $209.50/month in 2027 โ quietly consuming 8-9% of a typical raise for the majority of beneficiaries who have it deducted automatically.
- The estimate has already been revised down once this year, from an earlier ~3.9% projection to the current mid-3% range, as more actual inflation data came in.
What We Know About the 2027 COLA So Far
Every September, retirees, near-retirees, and financial planners start watching for the same number: how much will Social Security checks go up next year? For 2027, independent nonprofit The Senior Citizens League currently projects a 3.5% cost-of-living adjustment, based on September 2026 inflation data โ a downgrade from its own earlier estimate of roughly 3.9% issued a few months prior. AARP's separate projection, built using inflation data from October 2025 through August 2026 plus a Federal Reserve Bank of Cleveland forecast for September, lands slightly higher at 3.6%.
Neither figure is official. The Social Security Administration doesn't calculate or announce the COLA until all the required inflation data for the year is in hand โ but with only one month of data left to go, analysts say there's relatively little uncertainty left, and expect the final number to land somewhere in the mid-3% range.
How the COLA Is Actually Calculated
The Social Security COLA isn't set by Congress, the President, or any committee vote โ it's a fixed formula written into law. Each year, the Social Security Administration compares the average CPI-W (Consumer Price Index for Urban Wage Earners and Clerical Workers) for the third quarter of the current year โ July, August, and September โ against the same three months of the prior year. The percentage increase between those two averages, rounded to the nearest tenth of a percent, becomes next year's COLA.
Because the formula only uses three specific months, a single hot or cool inflation reading in July, August, or September can move the final number more than the same reading would in, say, February. That's exactly why the September Consumer Price Index report โ due out the same morning as the COLA announcement โ is the last real piece of the puzzle.
The COLA is designed to preserve purchasing power, not to increase it. If prices rose 3.5% over the past year, your benefit rises 3.5% too โ the goal is that your check buys roughly the same basket of goods, not more of it.
Social Security COLA History: 2023-2027
Context helps here. After the historic 8.7% COLA in 2023 โ the largest in over four decades, driven by the post-pandemic inflation spike โ increases have settled back into a more typical range:
| Year | COLA | Status |
|---|---|---|
| 2023 | 8.7% | Official (post-inflation-spike high) |
| 2024 | 3.2% | Official |
| 2025 | 2.5% | Official |
| 2026 | 2.8% | Official |
| 2027 | 3.5%-3.6% (est.) | Estimated โ official Oct 14, 2026 |
If the mid-3% estimate holds, 2027 would mark the second straight year the COLA has increased rather than shrunk โ a reversal of the steady decline seen from 2023 through 2025.
How Much More Will You Actually Get
As of mid-2026, the average monthly benefit for a retired worker sits at roughly $2,086 (up from the $2,071 average that took effect in January 2026 after the 2.8% COLA, reflecting new retirees joining the rolls with higher lifetime earnings). Applying the current 2027 estimates:
| COLA Estimate | Monthly Increase | Annual Increase | New Average Benefit |
|---|---|---|---|
| 3.5% (Senior Citizens League) | +$73 | +$876 | ~$2,159/month |
| 3.6% (AARP) | +$75 | +$900 | ~$2,161/month |
Those figures are averages โ your own increase depends entirely on your current benefit amount, since the COLA is a percentage, not a flat dollar amount. Someone receiving $1,500/month would see roughly $53-$54 more, while someone at the maximum benefit would see a considerably larger dollar increase for the same percentage.
Take your current monthly Social Security benefit and multiply it by 1.035 (for the 3.5% estimate) or 1.036 (for 3.6%) to get a rough preview of your 2027 check โ or use our Social Security Calculator to model your benefit at different claiming ages alongside the estimated increase.
The Medicare Part B Wildcard
Here's the catch most headlines skip: the vast majority of Social Security beneficiaries have their Medicare Part B premium deducted automatically from their monthly check, before it's ever deposited. According to the latest Social Security and Medicare Trustees Report, the standard Part B premium is projected to rise from $202.90/month in 2026 to about $209.50/month in 2027 โ a $6.60 increase.
Against a $73-$75 average COLA increase, that $6.60 premium hike consumes roughly 8-9% of the raise before it reaches your bank account. It's a real bite, but a far smaller one than beneficiaries faced in 2026, when Part B premiums jumped nearly 10% in a single year.
These are standard Part B premium figures. Beneficiaries with higher reported income (via IRMAA, the Income-Related Monthly Adjustment Amount) pay significantly more than the standard premium, which further reduces their effective COLA increase in dollar terms.
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See how a 2027 COLA increase, combined with your other savings, affects your total retirement income over time.
Use the Retirement Calculator โWhy the Estimate Dropped From 3.9% to 3.5%
Early 2026 projections for the 2027 COLA ran as high as 3.9%, based on limited inflation data from the first few months of the year. As more actual CPI-W readings came in through the spring and summer, the underlying inflation trend cooled somewhat, and forecasters revised their projections downward step by step โ landing in the mid-3% range that both major independent estimates now share.
This is a normal part of the process every year: early estimates are built on partial data and tend to swing more, while estimates made closer to the official announcement โ with fewer unknown months left โ converge and stabilize. With only the September CPI reading outstanding, the current 3.5%-3.6% range is about as close to final as an unofficial estimate gets.
What to Do While You Wait
- Don't budget around an unofficial number. Estimates have already moved once this year; wait for the SSA's official announcement on October 14, 2026 before making firm spending plans.
- Factor in Medicare Part B. If you have Part B premiums deducted from your check, subtract the projected $6.60 increase from your expected raise to get a more realistic net figure.
- Recalculate your full retirement income picture, not just Social Security โ pair your expected COLA with pension, 401(k), or investment income using a broader retirement calculator.
- Watch for your COLA notice. The SSA typically mails (or posts to your online "my Social Security" account) a personalized COLA notice in early December showing your exact new benefit amount for January.
Frequently Asked Questions
1. What is the estimated 2027 Social Security COLA?
As of September 2026, independent estimates put the 2027 COLA in the mid-3% range โ The Senior Citizens League projects 3.5% (revised down from an earlier 3.9% estimate), while AARP's projection is 3.6%. The official figure won't be confirmed until October 14, 2026.
2. When will the official 2027 COLA be announced?
The Social Security Administration is expected to announce the official 2027 COLA on October 14, 2026, at approximately 8:30 a.m. Eastern Time, alongside the Bureau of Labor Statistics' September Consumer Price Index report.
3. How is the Social Security COLA calculated?
The COLA is based on the percentage increase in the CPI-W (Consumer Price Index for Urban Wage Earners and Clerical Workers) from the third quarter (July, August, September) of the current year compared to the third quarter of the prior year. If there's no increase, there's no COLA.
4. How much more money will retirees get in 2027?
Based on the average retired-worker benefit of roughly $2,086 per month, a 3.5% COLA would add about $73 a month (roughly $876 a year), while a 3.6% COLA would add about $75 a month. The exact amount depends on your own current benefit.
5. Does Medicare eat into the Social Security COLA?
Yes, for most beneficiaries. Medicare Part B premiums are typically deducted directly from Social Security checks, and are projected to rise from $202.90 to about $209.50 a month in 2027 โ a $6.60 increase that would consume roughly 8-9% of a typical COLA raise before it ever reaches your bank account.
6. Why was the 2027 COLA estimate revised down from 3.9% to 3.5%?
Early-2026 estimates were based on limited inflation data and ran higher. As more months of actual CPI-W data came in through the summer, the trend cooled, pulling projections down into the mid-3% range. With only the September inflation reading left before the final calculation, forecasters say there's less uncertainty left in the estimate.
