Oklahoma sales tax calculator
The Oklahoma state sales tax rate is 4.5%. City, county and special-district taxes stack on top, so set the combined rate if you know it.
%
Total with tax
104.50
- Tax added
- 4.50
- Total for the quantity
- 104.50
- Price before tax, working backwards
- 102.63
- Tax inside a tax-inclusive price
- 4.62
- Tax as a share of the total
- 4.3062 %
- Multiply the net price by this
- 1.045 000
Show the working
- Price before tax = 100
- Sales tax rate = 4.5
- Or a price that already includes tax = 107.25
- Quantity = 1
- Tax added = 100 * 4.5 / 100 = 4.5
- Total with tax = 100 + 4.5 = 104.5
- Total for the quantity = 104.5 * 1 = 104.5
- Price before tax, working backwards = 107.25 / (1 + 4.5/100) = 102.632
- Tax inside a tax-inclusive price = 107.25 - 102.632 = 4.618 42
- Tax as a share of the total = 104.5 > 0 ? 4.5 / 104.5 * 100 : 0 = 4.306 22
- Multiply the net price by this = 1 + 4.5/100 = 1.045
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.
Frequently asked
What is the sales tax rate in Oklahoma?
The state base rate is 4.5%, 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 4.5% that means dividing by 1.0450.
Where the numbers come from
- State base rates as published by state revenue departments; local additions are not included.