Arabic (دين مستقر) for debt (dain) that represents an established liability on a debtor (madeen). In other words, payment or repayment shall be made by the debtor immediately when it falls due or on demand (whatever is stipulated in the contract). This type of debt cannot be extinguished except by a new contract. Examples of dain mustaqir is one that results from a ba’i or sale transaction (the purchase price- if on credit) and damages that accrue as compensation for loss or injury.

Dain mustaqir is a valid and collectible debt (confirmed debt).