What must a landlord do if tenant contributions exceed a certain limit during recertification?

When a tenant's contributions exceed a certain limit during recertification, it is essential that the rent assistance amount reflects the tenant's current income situation. Therefore, redetermining the rent assistance amount based on income changes is the appropriate action. This process ensures that the assistance provided aligns with the tenant's financial circumstances, maintaining the affordability of housing for the tenant.

This adjustment is crucial for both the tenant and the housing authority, as it guarantees that the assistance program remains effective and responsive to changes in income. It also helps to prevent situations where tenants could face undue financial burden as their contributions increase without a corresponding adjustment in the assistance they receive.

The other choices do not address the need to adjust financial assistance based on income changes. Notifying a tenant that they must move, altering lease terms, or ignoring the income increase would not be appropriate responses and could lead to issues maintaining compliance with housing regulations and ensuring fair treatment of tenants.