County surcharges in Hawaii add to the state’s base General Excise Tax (GET) rate of 4%. For example, Honolulu imposes a 0.5% surcharge, bringing the total GET to 4.5%. Oahu increased its surcharge to 0.75% in 2024, resulting in a GET of 4.75%. Similarly, Maui introduced a 0.5% surcharge, elevating its GET to 4.5%, while Hawaii County maintains a 0.25% surcharge at 4.25%. Kauai continues with a 0.5% surcharge, keeping its total GET at 4.5%. These surcharges fund local infrastructure and public services, affecting the total GET businesses and consumers pay based on location.