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HI The standard two letter abbreviation for the state of Hawaii is HI.
A Note on Hawaii Tax Terminology. Instead of the more common term âsales tax,â Hawaii law uses the term âgeneral excise tax.â Hawaiiâs Department of Taxation currently directs taxpayers to Tax Facts 96-1 for an explanation of the relationship between the two terms. In this article, âsales taxâ and âgeneral excise taxâ are used interchangeably.