This variable contains total monthly person-level earnings as reported in the SIPP for month M. M goes from 1 to 48 and represents the month number since the start of panel_1stfullyear. This includes both job and business (self-employment) earnings and is top-coded. Only the first 24 months of the individual's SIPP panel are in universe. A later release of these data will add months after 24 for longer SIPP panels. Months that are outside the time frame covered by an individual's SIPP panel will always be missing and out of universe.