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I set up destination zones for Florida because there are several different sales tax rates. Each zone has a list of zip codes that share the same tax rate.
After setting up the zones, I went to the taxes tab and entered the zones with the applicable tax rate for that particular zone. I then tried to run a test check out.
The calculated tax was zero for each of the custom zones I created. However, if I set up a zone for the whole state at 7%, the check out calculated the tax properly.
Why isn't the custom destination zones' tax being calculated at checkout?

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