The 2027 Social Security cost-of-living adjustment is not official yet, but the latest credible forecasts are clustering around roughly 3.5% to 3.6%. The final number depends on September 2026 CPI-W data, which the U.S. Bureau of Labor Statistics is scheduled to release on October 14, 2026 at 8:30 a.m. Eastern Time.
That date matters because September is the final month needed for the formula Social Security uses to calculate the annual COLA. Until the Bureau of Labor Statistics publishes that figure and the Social Security Administration announces the adjustment, every percentage circulating online remains an estimate.
Latest 2027 Social Security COLA estimate
As of October 7, several forecasts are concentrated in a narrow band:
- 3.5% is the current estimate from The Senior Citizens League and several inflation trackers.
- 3.6% has appeared in other forecasts, including estimates cited by retirement publications and AARP-related coverage.
- The final result can still move because September CPI-W has not yet been released.
A useful way to think about the range is that the first two months of the third quarter are known, while the final month is still missing. A modest difference in September inflation can move the rounded COLA by a tenth of a percentage point.
When will the official 2027 COLA be announced?
The key date is Wednesday, October 14, 2026. The Bureau of Labor Statistics CPI page lists the September 2026 Consumer Price Index release for 8:30 a.m. ET that day.
The Social Security Administration says it will announce the next COLA in October 2026. Because the calculation uses third-quarter CPI-W data, the September release supplies the final input. The official SSA COLA summary is the best place to confirm the final percentage once it is posted.
How Social Security calculates the COLA
The COLA is based on the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W), not simply the headline CPI number that often appears in news reports.
In simplified form, Social Security compares the average CPI-W for July, August and September of the current year with the average for the same three months in the last year in which a COLA was determined. The percentage increase, rounded according to the statutory formula, becomes the next COLA.
For the 2027 adjustment, July and August 2026 CPI-W readings are already available. BLS reported an August CPI-W index level of 328.481. September is the final missing value.
Why 3.5% is getting so much attention
A 3.5% projection is currently plausible because the known third-quarter data place the calculation close to that level before the September reading. One independent tracker, Nowflation, estimated 3.5% after modeling the missing September CPI-W figure and applying the same quarter-over-quarter method used by Social Security.
That does not make 3.5% official. A forecast is only as good as its September assumption. The final CPI-W print can shift the result.
What a 3.5% COLA would mean for monthly benefits
The examples below are simple illustrations. Actual benefit amounts depend on each person’s current payment, deductions, rounding and other factors.
| Current monthly benefit | At 3.5% | Approx. monthly increase |
|---|---|---|
| $1,000 | $1,035 | $35 |
| $1,500 | $1,552.50 | $52.50 |
| $2,000 | $2,070 | $70 |
| $2,500 | $2,587.50 | $87.50 |
| $3,000 | $3,105 | $105 |
What a 3.6% COLA would mean
| Current monthly benefit | At 3.6% | Approx. monthly increase |
|---|---|---|
| $1,000 | $1,036 | $36 |
| $1,500 | $1,554 | $54 |
| $2,000 | $2,072 | $72 |
| $2,500 | $2,590 | $90 |
| $3,000 | $3,108 | $108 |
The difference between a 3.5% and 3.6% COLA is relatively small on a single monthly check, but it compounds across a full year and also raises the baseline used for future benefits.
When would a 2027 COLA take effect?
Once the 2027 COLA is official, the increase would generally apply to Social Security benefits payable for January 2027. SSI timing can differ because of how payment dates fall around the end of the year. SSA normally provides individualized notices before the new payments begin.
You do not normally need to apply for a COLA. It is an automatic adjustment for eligible beneficiaries.
Could Medicare reduce the amount people actually see?
Yes. Many beneficiaries have Medicare Part B premiums deducted directly from their Social Security payment. A higher gross Social Security benefit does not necessarily translate into the same increase in the amount deposited if Medicare premiums or other deductions also rise.
That is why the COLA percentage and the net increase in a bank account are two different numbers. The COLA raises the underlying benefit; deductions determine how much of that increase is visible in the final payment.
Why online “official COLA” claims before October 14 should be treated cautiously
Any page claiming a final, official 2027 COLA before the September CPI-W release should be checked carefully. As of October 7, BLS has not yet released September CPI, and SSA has not announced the 2027 COLA.
Look for language such as “estimate,” “projection” or “forecast.” A credible source should distinguish that from the official figure.
What to watch on October 14
There are three useful checkpoints:
- 8:30 a.m. ET: BLS publishes September CPI data, including the CPI-W needed for the calculation.
- SSA announcement: Social Security publishes the official COLA percentage.
- Benefit tables and notices: SSA later provides updated examples and individualized notices showing new payment amounts.
How this compares with the 2026 COLA
The official 2026 COLA was 2.8%. If 2027 lands around 3.5%–3.6%, it would be larger than the 2026 adjustment. That comparison helps explain why interest is accelerating ahead of the October 14 release.
If you recently saw an unexpected Social Security deposit, our separate guide on why some people received a $90 Social Security payment explains that issue; it is separate from the 2027 COLA calculation.
FAQ
Is the 2027 Social Security COLA 3.5%?
Not officially. 3.5% is a current projection. The official number will depend on September 2026 CPI-W data.
When will the 2027 COLA be announced?
The decisive CPI release is scheduled for October 14, 2026 at 8:30 a.m. ET, and SSA is expected to announce the COLA after the final third-quarter data are available.
Does everyone get the same dollar increase?
No. The COLA is a percentage, so the dollar increase depends on the current benefit amount and applicable deductions.
Do I need to apply for the COLA?
No. Eligible benefits are adjusted automatically.
What inflation index does Social Security use?
Social Security uses CPI-W, the Consumer Price Index for Urban Wage Earners and Clerical Workers.
Bottom line
The strongest current forecasts put the 2027 Social Security COLA near 3.5% to 3.6%, but the number is not final. September CPI-W arrives October 14, 2026, and that release will settle the calculation. Until then, treat any precise percentage as a projection rather than an official benefit increase.
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