How To Calculate Invoice Totals

  1. Each item/product can either be taxed or not.
  2. Tax(calculated per company tax rate) is added to unit cost.
  3. Sub-Total is a result of sum of totals of added items/products.
  4. Discounts are subtracted from subtotal.
  5. Final total is calculated by adding Tax to Sub-Total then subtracting discount.

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