The theory is as time passes it becomes more expensive to maintain the same standard of living, so adjustments should naturally be made to compensate for this. In a sound economy, the increase in the cost of living should be offset by increased earnings or wages.

When child support orders are modified, the new amounts are a product of current guidelines and schedules.

COLAs are generally tied to increases in the Consumer Price Index (CPI), a report issued monthly by the Department of Labor, or may be graduated to a local index.