The National Association of Realtors reported that the Composite Index of Home Affordability declined 8.8% y/y during April to 145.8, the lowest level since October 2008. The index was 32.0% below its peak in January 2013. During the last ten years, there has been a 60% correlation between the affordability index level and the y/y change in existing single-family home sales.

Higher prices have reduced affordability. The median sales price of an existing home strengthened 5.5% y/y to $259,900. The price rise was accompanied by a higher average mortgage rate of 4.66%, up from a 3.43% in December 2012. Together, principal & interest payments rose to $1,073 or 17.1% of median income, the highest percentage since August 2007. That percentage compared to a low of 11.7% early in 2013. Growth in median family income slowed to 2.8% y/y from 3.9% during all of 2016.

The Housing Affordability Index equals 100 when median family income qualifies for an 80% mortgage on a median priced existing single-family home. A rising index indicates more buyers can afford to enter the home-buying market. Data on Home Affordability can be found in Haver's REALTOR database. Interest rate data can be found in the WEEKLY and DAILY databases.