Does Hawaii have a sales tax?

Not in the traditional sense. Hawaii levies a General Excise Tax (GET) on businesses rather than a sales tax on buyers. Businesses commonly pass the GET through to customers, so it functions like a sales tax at checkout.

Why is the Honolulu rate 4.712% and not 4.5%?

The base GET is 4% plus a 0.5% Oahu county surcharge, totaling 4.5%. Because the passed-through GET is itself part of the business's taxable gross income, the visible pass-through rate works out to 4.712%.

What is the county surcharge?

Oahu (the City and County of Honolulu) adds a 0.5% surcharge to the 4% state GET to fund rail transit. Other Hawaii counties have their own surcharge rates, so the combined rate varies by island.

Certain transactions, such as qualifying wholesale sales taxed at a lower rate and some medical services, are treated differently under the GET. The exempt toggle zeroes the pass-through for items not subject to the retail rate.

Can I use this for other Hawaii islands?

The default is Oahu's 4.712% pass-through. For Maui, Kauai, or Hawaii Island, replace the rate with that county's combined pass-through rate, since surcharges differ by county.

Honolulu Combined Sales Tax Calculator

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Calculate Honolulu tax the right way

Hawaii does not have a conventional sales tax — it has the General Excise Tax (GET), levied on businesses and usually passed through to customers. On Oahu (Honolulu) the base 4% GET plus a 0.5% county surcharge produces a visible pass-through rate of 4.712%, and this tool computes it exactly.

How it works

The calculator multiplies the taxable amount by the pass-through rate and adds it to the purchase:

taxable amount = exempt ? 0 : purchase amount
tax            = taxable amount * (rate / 100)
total          = purchase amount + tax

The 4.712% pass-through rate already accounts for the “tax on tax” effect: because the GET a business collects is part of its own gross income, 0.045 / (1 - 0.045) equals about 0.04712, which is the rate retailers display.

Tips and example

A $100 purchase on Oahu adds 100 * 0.04712 = $4.71 in GET pass-through, for a total of $104.71. A $1,000 purchase adds about $47.12, totaling $1,047.12.

If you are on another island, swap in that county’s combined rate — for example, counties without the surcharge use a lower pass-through near 4.166%. Toggle the exempt box for transactions taxed at the wholesale rate rather than the retail rate.