What things did the leaders of groups that become part of the Inca empire have to do?

Leaders of groups that became part of the Inca empire had to pledge allegiance to the Inca ruler, acknowledge the Sapa Inca as their supreme leader, pay tribute in the form of goods or labor, adopt Quechua as their language, and adhere to Inca religious practices. They also had to assist the Inca in times of war and participate in the mit'a labor system when required.