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I want to create a custom tax rate percentage calculation for bundle products.

I have a standard rate of 20% tax set up to be applied to all products that have taxable goods tax class set on them. I have a bundle product that has 2 simple products associated with it. 1 has a tax class of 'Taxable Goods', the other has a tax class of 'None'. The bundle product has a fixed price and SKU.

When this product is added to the basket the tax rate applied to the product should be 10%. This is because 50% of the products being purchased are taxable, therefore only 50% of initial tax rate (20%) applies. See my example below of how I would like this to work.

C * ( B / A ) = Tax rate to be applied to the bundle product

20 * ( 1 / 2 ) = 10

  • A = Total number of products in the configured bundle.
  • B = Total number of taxable products in the configured bundle.
  • C = Tax Rate (20%)

Does anyone know where in the core code I could plugin to implement such a feature?

  • Any luck? I have this problem too. – paul Sep 15 '19 at 14:05
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    Hi Paul - I managed to get this to work by preferencing the Magento\Tax\Model\Calculation\TotalBaseCalculator class and applying updates to the calculateWithTaxInPrice function. It's not a great solution so reluctant to apply it in here as an answer. Hope that helps. – Ryan Copeland Sep 16 '19 at 15:38
  • Thanks @Ryan Copeland I also had a solution to this thats not as slick but I just made a ad-hoc tax class and added a calculator to the admin to do the calculation and apply the ad-hoc tax rate. – paul Sep 17 '19 at 17:40

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