We can see how closely the census and IRD definitions of a workforce align with each other by checking how much they overlap during the month of the census. The chart below shows the proportion of those classified by either definition who are classified by each definition. The donut charts show a breakdown of why people were not included in a particular definition.
The exact proportion differ between industries, but the main reason for not being included in a definition is that no record exists either in the census or IRD records. There may be no IRD record because a worker happened to not make any income in the month of the census but was working in the sector in earlier months. Those people who received income in March 2013 but did not appear in the census are more difficult to explain. They will be some combination of people who happened to go overseas during the census, those who did not fill out the census, and those whose census records have not been matched to their IRD records.