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Why a VAT API Needs More Than a Rate Lookup

When developers first add VAT to an ecommerce or SaaS product, the problem can look surprisingly small: Find the customer's country. Look up the VAT rate. Multiply the price by that percentage. Done.

  • A VAT API must handle complex edge cases beyond simple rate lookup.
  • It requires product categories, transaction dates, and price basis information.
  • Comprehensive calculation records enable auditing and understanding the decision-making process.

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