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Applies to Product - Dynamics 365 Commerce

What’s happening?
Customers are experiencing discrepancies in tax calculations when changing products from the Point of Sale (POS) system. The registered taxes do not reflect the correct values, leading to confusion regarding the taxable base and the total amount due.


Reason:
This arises from a parameter in the system settings related to tax calculation behavior. If the parameter "Tax Calculation Behavior" is set to "Recalculate," it can lead to incorrect tax processing when transactions are recorded in the Finance system. The taxable base is being calculated incorrectly, as it appears to subtract the tax amount from the actual base value, resulting in a lower taxable base being displayed.


Resolution:
Verify the configuration of the "Tax Calculation Behavior" parameter in the system:

  1. Navigate to Retail and Headquarters setup -> Parameters.
  2. Check if the parameter is set to "Recalculate" or "No Recalculate."
  3. If the parameter is set to "Recalculate," change it to "No Recalculate."
  4. After making the change, perform tests by generating examples of product changes both with and without references to see if the tax behavior corrects itself.