A contract is ended when two parties had already done their contractual obligations. Completing their tasks or performance marks the end of their agreement. They will no longer be bound legally as they are already finished with their work.
2. Mutual Agreement
The contract can end if both parties mutually agreed to end their contractual obligations. They are allowed to be free from their tasks without completing or fulfilling them. One party may also be allowed to be released by the other party to complete even if they had not fulfilled nor completed their obligation.
The contract can be ended with frustration if there are unforeseeable events that suddenly arise along the way. This frustration must be proven and must not be caused by either party. They should also make sure that this event was unforeseeable
4. Contract Breach
Of course, a contract can end if one party breaches the contract. A breach means one party failed to perform his/her contractual obligation. Given that the task that was supposed to be performed is something major or essential for the project, the non-breaching party may consider to end the contract or perhaps just settle the situation with the other party.