The lieutenant governor has two constitutional functions.
The primary function is to serve as the President of the Indiana Senate.
In the Senate the lieutenant governor is permitted to debate on legislation, introduce legislation, and vote on matters to break ties.
As presiding officer in the Senate, lieutenant governors also have partial control over what legislation will be considered, and influence on the legislative calendar.
Unless a special session is called by the governor, the Senate meets for no more than 91 days in any two years period, leaving the lieutenant governor free from his or her senatorial duties in the remainder of the year.

The secondary function is to serve as a successor to the governorship should it become vacant, or act as governor if necessary.
If a lieutenant governor should succeed to the governorship, the office of lieutenant governor and President of the Senate become vacant; the duties are taken over by the Senate President pro tempore.
The lieutenant governor has two constitutional functions. The primary function is to serve as the President of the Indiana Senate. In the Senate the lieutenant governor is permitted to debate on legislation, introduce legislation, and vote on matters to break ties. As presiding officer in the Senate, lieutenant governors also have partial control over what legislation will be considered, and influence on the legislative calendar. Unless a special session is called by the governor, the Senate meets for no more than 91 days in any two years period, leaving the lieutenant governor free from his or her senatorial duties in the remainder of the year.
The secondary function is to serve as a successor to the governorship should it become vacant, or act as governor if necessary. If a lieutenant governor should succeed to the governorship, the office of lieutenant governor and President of the Senate become vacant; the duties are taken over by the Senate President pro tempore.
Lieutenant Governor of Indiana