complex tax calculation, how?

Question

I want to calculate a special tax on shipping costs.
Example:
Someone purchased two products: one product with 6% taxes and one with 21%
Product one is 7,50 with 6% tax included
Product two is 2,50 with 21% tax included
Total amount is 10.00 euro with tax included
So 75% of the products are taxed with 6% tax
and 25% of the producs are taxed with 21% tax
Shipping costs are 3,50 with tax included, but:
75% of 3,50 needs to be taxed with 6% tax
and 25% of 3,50 with 21%tax
How do I do this?

michel Guénard · Answer

Create a tax code (new and specific to your case) where the calculation will result from a python formula

Code Python (TVA Incl)

result = ((price_unit*0.75*0.06) + (price_unit*0.25*0.21))

where price_unit is the price of the product "Shipping to be invoiced" (to be created in your system)

André Schenkels · Answer

The easiest way would be to just create 2 shipping cost products 1 with 6% and one with 21%

But this will not be easy to fix. You will need to build a small module for this.

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