An installment contract is a single contract that is completed by a series of performances –such as payments, performances of a service, or delivery of goods–rather than being performed all at one time. Installment contracts can provide that installments are to be performed by either one or both parties .
An installment contract offers a buyer less protection than a traditional mortgage. This is true mainly because of forfeiture provisions, which give the buyer no right of redemption and allow a buyer to lose all interest in the property for even the slightest breach.
The instalment rate calculation is: (Estimated (notional) tax ÷ instalment income) × 100.