Sales Tax Calculator

Use this endpoint when you need a quick, paid per-call sales tax computation without setting up a dedicated tax service integration. Best for lightweight e-commerce, invoicing, or compliance checks where occasional lookups are needed and a small per-call cost is acceptable. Not ideal for high-volume batch tax calculations where a subscription-based provider like TaxJar or Avalara would be more cost-effective.

• Missing required location or amount fields returns a 400 error
• Unrecognized jurisdiction or ZIP code may return null or default rate
• Empty input schema may cause unpredictable behavior given lack of defined fields
• Service may be unavailable or return 402 payment required if payment header is missing
• Stale tax rate data may return outdated rates for recently changed jurisdictions