Social Security Cola 2024 Increase Percentage Calculator. The average percentage change in the index over those three months determines the amount of the cola. A 3 percent adjustment would boost the average social security retirement benefit — $1,839 a month in july 2023 — by about $55 a month in 2024.

Social security benefits will increase by 2.5 percent beginning with the december 2024 benefits, which are. The cola shown for a year is.