This transaction has similarities with ijarah transactions (selling services) that is the wage for obtaining benefits or services. But there are some differences between the ju'alah and ijarah transactions. The details are as follows:
First, ju'alah is a binding transaction when the worker starts doing his job. At that time, no party can unilaterally cancel the transaction. While ijara is a binding transaction since the transaction is held.
Secondly, in a transaction the wage becomes the employee's right after he or she has finished working and the employer has benefited from the work he has done.
Whereas in ijara transactions, wages or rent have become the rights of the leasing party when the leasing party has given opportunity to the tenant to utilize the goods that become the object of the transaction. The wages in the person's ijarah transactions are proportional to the work done. In ijarah transactions rent money may be submitted in advance.
Third, among the legitimate conditions of ijarah transactions is the clarity of services and or benefits that are sold in addition to the clarity of the lease term. As in the transaction is not required there should be clarity of the working period may be briefly, may be long such as the transaction ju'alah to return a vague animal.
In transaction ju'alah only required a clarity of services or benefits that become the object of the transaction. The clarity of the wage amount refers to a standard wage in an area for such a work if there is a dispute between two persons conducting a ju'alah transaction.