How do I ensure discount calculations are accurate for tax purposes?

As an e-commerce business owner, I'm struggling to understand how to calculate discounts accurately while ensuring tax compliance. I want to make sure that discounts are applied correctly before and after tax calculations, which can be complex depending on my product categories, customer location, and specific tax jurisdictions. My primary concerns are maintaining accurate financial records, avoiding potential tax reporting errors, and ensuring customers see transparent pricing throughout the checkout process.