Social Security’s 2027 COLA Is Converging Near 3.5%
The official 2027 Social Security increase is still weeks away, but three current estimates now cluster between 3.4% and 3.6%. Two inflation reports will decide whether retirees land near the middle of that range.
The 2027 Social Security cost-of-living adjustment is beginning to look less like a wide-open forecast and more like a narrowing range. The official number has not been set, but the most recent estimates now cluster around 3.5% — high enough to beat this year’s 2.8% increase, but not high enough to erase the pressure many retirees still feel from food, housing, energy and medical costs.
As of August 25, three closely watched estimates point in the same general direction. The Senior Citizens League is at 3.6%. AARP is at 3.5%. Independent Social Security and Medicare analyst Mary Johnson has a rolling estimate of 3.4%.
That does not make 3.5% a done deal. It does, however, make it the center of the current forecast range. The next two inflation reports will tell beneficiaries whether that center holds.
The real decision dates are September 11 and October 14
Social Security does not use a committee vote or a discretionary White House decision to set the annual COLA. The adjustment is mechanical. Under federal law, the Social Security Administration compares the average Consumer Price Index for Urban Wage Earners and Clerical Workers, or CPI-W, for July, August and September with the corresponding third-quarter average from the prior comparison year.
The 2025 third-quarter CPI-W average was 317.265. July 2026 came in at 327.104, 3.4% above its level a year earlier. But July is only one-third of the calculation.
The Bureau of Labor Statistics is scheduled to publish August inflation data on September 11 at 8:30 a.m. Eastern time. The September report is scheduled for October 14 at 8:30 a.m. That second release supplies the final missing month in the COLA formula. The Social Security Administration has said the next COLA will be announced in October, and AARP and the Senior Citizens League expect the official figure on October 14 after the inflation release.
That is why anyone claiming the 2027 increase is already fixed is getting ahead of the data.
What the numbers are quietly saying
The arithmetic explains why forecasts are bunching together. If the CPI-W rose by roughly 0.3% in both August and September from July’s level, the final COLA would come out near 3.4%. Sequential monthly increases closer to 0.4% would put the result around 3.5%. If both months ran nearer 0.5%, the adjustment would be roughly 3.6%.
Those are scenarios, not predictions. Energy prices, food costs and other volatile categories can shift the non-seasonally adjusted CPI-W quickly. But the range shows how little room remains for a dramatic surprise unless inflation accelerates or cools sharply in the next two reports.
The Senior Citizens League has already moved its estimate down from 3.8% in July to 3.6% in August. AARP’s current estimate is 3.5%, while Johnson’s latest rolling calculation is 3.4%. The direction of travel over the past month has therefore been slightly lower, not higher.
What 3.5% would mean in an actual retirement check
The average retired worker received $2,085.98 a month in July, according to Social Security Administration data. On that amount, a 3.4% COLA would add about $70.92 a month. A 3.5% increase would add about $73.01. A 3.6% COLA would add about $75.10.
That would put the average monthly benefit, using the July figure only as an illustration, at roughly $2,156.90 to $2,161.08 before deductions.
The gross increase is not necessarily the same as the increase that appears in a beneficiary’s bank account. Medicare is one reason. The 2026 Medicare Trustees Report estimates the standard Part B premium will rise from $202.90 this year to $209.50 in 2027. If that estimate holds, the $6.60 monthly premium increase would absorb part of the Social Security gain for beneficiaries who have the standard premium deducted from their checks. The final 2027 Part B premium has not yet been set.
So a retiree looking at a projected $73 monthly COLA increase should not automatically budget for an extra $73 in spendable cash.
The base case now looks clearer
A reasonable reading of the public data today is that the 2027 COLA is more likely to land in the mid-3% range than near the 2.8% increase beneficiaries received this year. A result around 3.5% would also be above the roughly 2.6% long-run average cited by retirement groups for the past two decades.
But the last word belongs to the CPI-W, not to any forecaster. September 11 will show whether August inflation keeps the range intact. October 14 will provide the September number and, with it, the data needed to calculate the final adjustment.
For retirees trying to plan ahead, the useful takeaway is not that 3.5% is guaranteed. It is that the uncertainty has narrowed enough to make a mid-3% increase the current working assumption — with two data points left to change it.
