rsisco
commented
6 years ago There are a few things items worth noting when using this functionality:
- An individual product's subtotal may display inaccurately in the cart:
As noted in the screenshot, this is the result of rounding when the pretax price is being calculated from the provided post-tax price and tax rate. This same behavior is encountered when using native Magento tax calculation in this scenario and is not related specifically to the AvaTax extension.
- When prices include tax, applied discount amounts are considered to include tax and the subtotal includes the full discount amount:
The discount behavior should account for most use cases, since a discount will typically need to reduce the taxable amount of the order (exceptions being reimbursable discounts like manufacturer's coupons where the merchant ultimately still receives the full order value). The subtotal behavior still results in a correct order total, since the tax calculation doesn't use the visible subtotal amount and instead calculates it from scratch.
- When prices exclude tax, applied discount amounts are considered to exclude tax:
erikhansen
These changes are only to affect how the AvaTax extension communicates with the Avalara system for tax calculation in order to accommodate your desire to set the products' price attribute to include sales tax in the set value.