With a little more than a month before the 2025 COLA kicks in, here's what you should know about the upcoming adjustment.

Social Security's annual cost-of-living adjustments (COLAs) are calculated based on how inflation changes in the third quarter, the three-month period from July through September. In this scenario, inflation is measured using a subset of the Consumer Price Index (CPI) known as the CPI-W.

Due to how the Social Security Administration schedules payments to beneficiaries, some will receive theirs with the 2025 COLA increase in December.

Last month, the Social Security Administration announced that the next cost-of-living adjustment (COLA) will be 2.5%. Here's why the average take-home Social Security increase will be roughly 20% lower than they might expect.

But a 2.5% COLA for 2025 stings because it's the smallest one to arrive in years. At the start of 2024, seniors on Social Security saw their benefits increase by 3.2%. And the year prior, Social Security recipients got a record-breaking 8.7% COLA. So a raise of just 2.5% seems awfully meager by comparison.