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The e-commerce.

Tax not computed correctly


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I've got an osCommerce v2.3.1 system that is not calculating the tax correctly. Here's an example taken from an invoice screenshot:



The numbers in the table show up correctly. Each line item has a base price of $39 to which a 9.25% tax is added, making each line item's total $42.61. The problem is down below where it shows a tax of $19.81. This should actually be $21.66, making the total $255.66.


Any idea about what might be going on here? I have one tax zone added at 9.25% and it sure looks like it is using that rate for each line item... but not for the total.





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Ok, I got this resolved. I had things set so that the product price included the tax and the product final price included the tax. Turning both of these off, the numbers now come out correct.

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