The Discount Promotion offer ends on 23 October 2018. Thereafter the city will engage debt collectors to recover arrears. Customers who took advantage to pay their bills have been credited with the Discount as promised.
Government, businesses and residents now owe the local authority over $784 million.
Council hopes the incentives will rescue Harare from a financial crisis which has seen the local authority failing to pay salaries and provide basic services such as refuse collection.
When the city introduced a similar facility in 2016, it raked in $85 million.