It will depend on the contract and the nature of the breach. Some contractual breaches are considered to be material breaches that will give a right to termination and damages. Some breaches will require you to issue the other party with a notice giving them a right to rectify the breach. If the breach is not rectified, then the contract can usually be terminated, and damages sought. Each contract is different, and we always suggest seeking legal advice before taking precipitous action.