Hawaii Revised Statutes Division 2. Business § 478-2

When there is no express written contract fixing a different rate of interest, interest shall be allowed at the rate of ten per cent a year, except that, with respect to obligations of the State, interest shall be allowed at the prime rate for each calendar quarter but in no event shall exceed ten per cent a year, as follows:

As used in this section, “prime rate” means the prime rate as posted in the Wall Street Journal on the first business day of the month preceding the calendar quarter.