Newly Released 2009 COLA Forecast Would Keep Five Million Seniors Below Poverty Line "... lobbying for a change in the Consumer Price Index (CPI) used to determine the COLA. The government currently calculates the COLA based on the CPI for Urban Wage Earners and Clerical Workers (CPI-W), a slow-rising index that tracks the spending habits of younger workers who don't spend as much of their income on health expenditures. ..." [Reference: prnewswire.com]