New business may not be commenced after the question for the adjournment of the Senate has been first put on any sitting day. The purpose of this rule is to promote certainty in the conduct of business; senators should be able to assume that business in which they have an interest will not be commenced after the prescribed adjournment time. New business means any business on which the Senate is not engaged at the time when the adjournment is put. This means that, if the adjournment of the Senate is deferred and the Senate continues to transact business after that time, the only business dealt with is the business on which the Senate was engaged at that time.
This prohibition may, however, be suspended by motion on notice or by an absolute majority of senators (see under Suspension of standing orders, below), and this may occur at the end of a period of sittings due to the pressure of business. Such a motion must be moved before the question for the adjournment is put, but there are precedents for the motion being moved by leave after the adjournment is put.