Hi Layla,
You are entitled to levy rates in the year for which the rates are levied or in a subsequent year.
You mentioned a 603 certificate, so it’s impact will depend on when that was issued and whether your certificate appropriately indicated that the exemption status could change upon sale. That could only be a factor for the rating year in which the certificate was issued but would not impact levies for subsequent years.
Council has the ability to make a repayment arrangement to assist the customer and can consider waiving or reducing any interest accrued, including during the repayment period, after the rates have been paid (s564). I would strongly suggest trying to reach an agreement of this type and encourage you to be considerate of the customer’s position.
Suzi