SAP Knowledge Base Article - Public

2996101 - How Tax Net Base Amount is Calculated?


You have created a supplier invoice and you feel the Tax Base amount is not correctly calculated.


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Reproducing the Issue

  1. Go to Supplier Invoicing work center
  2. Select New Supplier Invoice without Purchase Order or 
  3. Select Invoice Entry-> New Invoice (with respect to preceding document)
  4. Enter the details and select Actions-> "Calculate Total Amount"
  5. The Tax net base amount is not what you expected.


Tax net base amount is calculated in the following way:

Go to Supplier Invoice->"Deductions and Surcharges" tab->

Gross amount: X (e.g 100)

Item Gross Deduction-> Y (e.g. 30)

Total Tax Amount: Z (e.g. 20)

(100-30)=70(Resulting Item Gross Amount/ Effective Gross Amount)

(70-20)=50 (tax net base amount)

(X, Y, Z are all referring to amount)


Please check in the "Deductions and Surcharges" tab to understand how the Tax net Base amount gets calculated.


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