I am going to implement third party solution for tax calculation on my site, so my concern here is Whether Kentico provide sales tax report by default for in built tax classes.
Or help on integrating third party tax calculation with report functionality.
You might check the default Kentico reports by navigating Reporting section in Kentico admin. There is a chance that someone added custom report there in such case my answer is no, I can't see any default tax report.
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