TUPE will apply if you work for an organisation or part of an organisation that is sold to a new owner or is merged with another organisation to make a new employer.
It also applies when your employer:
Brings in a contractor who takes over activities normally completed by employees, usually known as out-sourcing.
Replaces a contractor to take over activities from an existing contractor.
Is a contractor whose client takes over activities from your employer, often called in-sourcing.