Once you suffer a work-related injury in Pennsylvania, whether from a traumatic accident or from repetitive work activities, you must notify your employer. You should try to give notice within 21 days of the injury, and the sooner the better. Once you give notice of your on-the-job injury, the employer and/or workers’ compensation carrier has 21 days to accept, deny, or temporarily accept your claim by issuing one of three documents: a Notice of Compensation Payable, a Notice of Denial, or a Temporary Notice of Compensation Payable. If 120 days notice is not given, the claim will be barred forever.