HRS §40-66
What happens to unused government money
This section says that money set aside by the government for a certain time period must be used by the end of that period. If it is not used, it is lost unless a contract was signed before the period ended. The contract must be filed with the comptroller.
state agencies
The statute, as written — Appropriations lapse when
Unless otherwise provided by law all sums of money which are appropriated to the public service for any fiscal period, and which are not expended during the period, shall lapse, and shall not be issued or applied in any future fiscal period to the particular service for which the appropriation has been so made, unless a contract of engagement has been made and entered into before the expiration of the fiscal period by which a liability so to issue or apply the same has been incurred, and a certified copy of which contract or engagement has been deposited with the comptroller.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.