General excise tax
4% to 4.5%
Hawaii has no sales tax; the General Excise Tax is charged on the business at 4%, rising to 4.5% where a county 0.5% surcharge applies, which is true in all four counties for now. GET is legally the seller's liability, not the buyer's, but the law lets you pass on a slightly higher rate to the customer to cover the tax-on-tax effect, up to about 4.712% where the county surcharge applies and 4.166% where it does not. Storeveu's per-department tax rules carry the correct GET and pass-on rate for each store, inherited at state level with a per-store override for the county your location sits in.