Hawaii sales tax calculator
The Hawaii state sales tax rate is 4%. City, county and special-district taxes stack on top, so set the combined rate if you know it. Technically a general excise tax on business income, usually passed on to the buyer.
- Tax added
- 4.00
- Total for the quantity
- 104.00
- Price before tax, working backwards
- 103.13
- Tax inside a tax-inclusive price
- 4.13
- Tax as a share of the total
- 3.8462 %
- Multiply the net price by this
- 1.040 000
Show the working
- Price before tax = 100
- Sales tax rate = 4
- Or a price that already includes tax = 107.25
- Quantity = 1
- Tax added = 100 * 4 / 100 = 4
- Total with tax = 100 + 4 = 104
- Total for the quantity = 104 * 1 = 104
- Price before tax, working backwards = 107.25 / (1 + 4/100) = 103.125
- Tax inside a tax-inclusive price = 107.25 - 103.125 = 4.125
- Tax as a share of the total = 104 > 0 ? 4 / 104 * 100 : 0 = 3.846 15
- Multiply the net price by this = 1 + 4/100 = 1.04
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- tax = price x rate
- total = price x (1 + rate)
- to remove tax: net = gross / (1 + rate), never gross x (1 - rate)
Removing a tax is division, not subtraction. Taking 7.25% off a tax-inclusive price undercharges you every time.
Rates change and local additions vary by address. Treat the prefilled rate as a starting point and check the current combined rate for the exact jurisdiction.
Technically a general excise tax on business income, usually passed on to the buyer.
Frequently asked
What is the sales tax rate in Hawaii?
The state base rate is 4%, before any city, county or district additions.
How do I work out the price before tax?
Divide the tax-inclusive price by 1 plus the rate. At 4% that means dividing by 1.0400.
Where the numbers come from
- State base rates as published by state revenue departments; local additions are not included.