For the purpose of this plan, lower income is defined as being less than 60% of the average relative median household income before housing costs as published annually in the HBAI report.
At ddiben y cynllun hwn, diffinnir incwm is fel llai na 60% o incwm cyfartalog canolrifol cymharol y cartref cyn costau tai, fel y'i cyhoeddir yn flynyddol yn adroddiad HBAI.