Social Security recipients could receive their largest cost-of-living adjustment in three years in 2027, with current estimates ranging from 3.5% to 3.6%. The increase would be higher than the 2.8% adjustment implemented in 2026, but the amount retirees ultimately keep will depend on healthcare costs, taxes and other deductions.

Why the 2027 COLA Could Be Higher

The annual Social Security cost-of-living adjustment is tied to inflation measured by the Consumer Price Index for Urban Wage Earners and Clerical Workers, or CPI-W. The calculation uses average CPI-W readings for July, August and September, compared with the same period a year earlier. The final 2027 figure is expected to be announced in October after September inflation data are available.

Current forecasts have moved around as inflation data have been released. The Senior Citizens League currently projects a 3.5% increase, while other estimates, including one from AARP, stand at 3.6%. Either figure would exceed the 2.8% COLA for 2026 and the 2.5% adjustment for 2025. It would also be above the 3.2% increase for 2024, making 2027 the largest adjustment in that three-year period.

What the Increase Could Add to Monthly Checks

The average monthly Social Security benefit for retired workers was $2,085.98 in July 2026. A 3.5% COLA would add approximately $73.01 per month, bringing the average payment to about $2,158.99 before deductions. A 3.6% adjustment would increase the monthly benefit by roughly $75.10, taking it to approximately $2,161.08.

The actual increase will differ by beneficiary because the percentage is applied to each person’s existing benefit. Someone receiving $1,500 per month would gain about $52.50 with a 3.5% COLA, while a retiree receiving $3,000 would receive an additional $105. The same percentage therefore produces different dollar increases depending on the size of the existing payment.

Medicare and Taxes Could Reduce the Net Gain

A higher Social Security payment does not necessarily translate into the same increase in disposable income. The standard Medicare Part B premium is $202.90 per month in 2026, while the 2027 premium has not yet been finalized. Any increase in that cost would absorb part of the additional Social Security income.

Taxes can also reduce the effective benefit for some households. Some beneficiaries pay federal income tax on part of their Social Security income, while higher-income Medicare beneficiaries can face additional income-related premiums. This means two retirees receiving the same COLA percentage could experience different changes in the amount they actually have available to spend.

Investors and retirees will now focus on the remaining September inflation data and the official 2027 COLA announcement expected in October. The more important question will be whether the increase in benefits can keep pace with healthcare, housing and other household costs. A larger COLA can raise nominal income without producing a significant improvement in real purchasing power if inflation continues to erode household budgets.