The American Housing Survey (AHS) and the American Community Survey (ACS) ask respondents about when their housing unit was built (hereinafter referred to as year built). Year built is also captured in property records and tax assessment records (hereinafter referred to as property tax records). This whitepaper presents discussion and analysis that was performed to assess using property tax data to impute year built for respondents who did not provide valid responses. The whitepaper concludes with a recommendation on how to impute year-built data.