The NCS is a BLS establishment survey of employee salaries, wages, and benefits. The survey produces the Employment Cost Index (ECI) as well as the Employment Cost for Employee Compensation (ECEC) along with employee benefit incidence and provision data. See U.S. Bureau of Labor Statistics.
Household income is an economic measure that can be applied to one household, or aggregated across a large group such as a county, city, or the whole country. It is commonly used by the United States government and private institutions to describe a household's economic status or to track economic trends in the US. See Household income in the United States.
The National Compensation Survey (NCS) provides comprehensive measures of occupational earnings; compensation cost trends, benefit incidence, and detailed plan provisions. It is used to adjust the federal wage schedule for all federal employees. Detailed occupational earnings are available for metropolitan and non-metropolitan areas, broad geographic regions, and on a national basis. See National Compensation Survey.