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Upon viewing the tax settings, I seems there is no a base tax rate:
Please take a look a this step by step guide to help you accomplish that: http://www.jotform.com/help/296-How-to-Add-Tax-to-Your-Payment-Form
Let us know if you have more questions, we will be glad to assist you.
When I assign a base rate it applies it to all states. I only want to charge Oklahoma buyers.
There was a space after the 'Oklahoma'_ on your form tax configurations. I have removed the space, and also added the 'ok' option.
It seems to be working properly now.
Please feel free to contact us if you need any further assistance.