The 2027 Social Security cost-of-living adjustment (COLA)—the annual benefit increase tied to inflation—is not official yet. The Senior Citizens League forecasts 3.5%, but the Social Security Administration will determine the final figure in October. Two of the three required inflation readings are available. September's reading, scheduled for October 14, 2026, will complete the calculation.
Table of Contents
- What determines the 2027 COLA?
- What do the available inflation readings show?
- What is the current forecast?
- What would a 3.5% increase mean for benefits?
What determines the 2027 COLA?
The legal formula uses the average Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) for July, August, and September 2026. SSA compares that average with the applicable third-quarter average from the prior year, rounds the result to the nearest 0.1 percentage point, and provides no increase if the rounded result is zero. The social Security Administration explains the calculation. That means July and August alone cannot establish the 2027 COLA.
September's CPI-W reading can still raise or lower the three-month average and change the final percentage. SSA determines COLAs each October. The increase applies to Social Security and Supplemental Security Income (SSI) payments, with Social Security benefits generally reflecting the adjustment in January. SSA describes the COLA framework.
What do the available inflation readings show?
The Bureau of Labor Statistics reported a july 2026 CPI-W index of 327.104 and an August index of 328.481. The September release is scheduled for October 14, 2026. BLS provided those readings and the release date.
The two available readings point to continued movement in the index, but they do not provide enough information to calculate the official COLA. The missing September figure remains decisive because all three months go into the statutory average. Until that reading is released and SSA applies the formula, every percentage remains an estimate.
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What is the current forecast?
The Senior Citizens League's final pre-announcement model forecasts a 3.5% COLA for 2027. Its September 11 forecast is 0.1 percentage point lower than its August estimate and higher than the official 2.8% COLA for 2026. The Senior Citizens League published the forecast.
The forecast can help with planning, but it is not an SSA determination. September CPI-W can still change the three-month average and produce a different result. Readers should treat 3.5% as a working estimate, not as a guaranteed increase.
What would a 3.5% increase mean for benefits?
A 3.5% COLA would add $70 per month to a $2,000 monthly benefit. The Senior Citizens League estimates that its cited average beneficiary payment would increase by $67.90, from $1,940.08 to $2,007.98. A practical planning approach is to test a range around the forecast rather than build a budget on one unconfirmed number: The increase would affect Social Security and SSI payments, but the final dollar change depends on the individual payment amount.
- Use the current benefit amount as the baseline.
- Estimate the increase using 3.5% as a provisional figure.
- Wait for the September CPI-W release and SSA's October determination before changing fixed-income plans.
- Recheck any budget assumptions after the official percentage is announced.
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