Time reference of the Household Spending and Income Survey is the month when the household data are collected
There are three time references of the Household Spending and Income Survey as follows: 

1. Population and housing data (section II and III) are based on the day of the visit to the household. 
2. Data of the daily spending (Section V) and monthly spending (Section VI) are based on the survey month when the household was examined.
3. Data of the durable goods (Section VII) and income (Section VIII) are based on the year that ends by the end of the survey month in which the household was examined.