Fix calculation of taxes when items are discounted #155
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This was referenced Nov 2, 2018
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Introduces the field "NetTotal" for orders and price items. This field represents the net amount of a single item or an order that taxes are calculated based on. While the "subtotal" amount is not discounted, the "NetTotal" is. This is especially important when prices are expected to include taxes. In these cases discounts are applied to the original price and then the net price is calculated. Since this fixes the behavior of the tax calculation for discounted orders this is where tests needed to change.
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@bcomnes this has been refined to not be a breaking change and is ready for review now 🙂 |
Fantastic thank you. |
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Brilliant, thank you @mraerino |
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@bcomnes nope. that was not part of my contract since it arrived later. it is only partly related as well |
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Fixes #129
- Summary
The current behavior of GoCommerce is to apply discounts after calculating taxes.
This is valid for neither VAT nor sales tax based systems because taxes need to be applied to the final net amount. See #129 for more info and examples.
This PR includes several refactors to make the change easier.
The central commit (11df6e0) will change the calculation of a single item to this procedure:
net_total)totalby addingnet_total+taxesIntroduces the field
NetTotalfor orders and price items.This field represents the net amount of a single item or an order that taxes are calculated based on. While the
SubTotalamount is not discounted, theNetTotalis.This is especially important when prices are expected to include taxes. In these cases discounts are applied to the original price and then the net price is calculated.
Notice: You can not calculate the net amount from the subtotal by subtracting the discount when prices include taxes. The discount will always be based on the original price while the behavior of the subtotal is not changed an will show the non-discounted net total. There are several possible improvements for that problem (e.g. adding a field "original price").
- Test plan
Several tests have been added or updated to reflect this altered calculation behavior.
Since this fixes the behavior of the tax calculation for discounted orders this is where tests needed to change.
- Description for the changelog
Fix calculation to apply discount before taxes
- A picture of a cute animal (not mandatory but encouraged)