You must notify the housing assistance agency immediately if

• the total income of all household members increases by more than 15 percent,
• your rent or your housing costs (excluding heating costs) decrease by more than 15 percent, or
• the number of household members decreases because they
  • are no longer part of the household
  • are no longer included in the housing allowance calculation.

If the changes are retroactive or become known retroactively, your entitlement to housing assistance will also be reduced retroactively.