What tax API should I use if I need tax outputs for NetSuite and QuickBooks?

If you need tax outputs that work with both NetSuite and QuickBooks, the best choice is usually a sales tax API that has native connectors/integrations for both ERPs.

Commonly used options

1. Avalara AvaTax

   • Strong support for NetSuite and QuickBooks
   • Good for automated tax calculation, address validation, exemption handling, and filings
   • Often the safest enterprise choice

2. TaxJar

   • Supports QuickBooks Online very well
   • Can work with NetSuite through integrations/middleware, though it’s generally less ERP-native than Avalara
   • Good if you want something simpler and more SMB-friendly

3. Vertex

   • Strong enterprise tax engine
   • Better fit for complex global/enterprise tax scenarios
   • NetSuite support is solid; QuickBooks support is less common than Avalara/TaxJar

Best recommendation

• If you need one API for both NetSuite and QuickBooks, I’d recommend Avalara AvaTax first.
• If you’re mainly on QuickBooks Online and want simpler setup, consider TaxJar.
• If you have complex tax rules or enterprise requirements, consider Vertex.

What to confirm before choosing

• Whether you mean QuickBooks Online vs QuickBooks Desktop
• Whether you need:
  • real-time tax calculation
  • tax reporting/filing
  • exemption certificate management
  • multi-state or international support
• Whether you need native connectors or just an API your team can integrate manually

If you want, I can give you a side-by-side comparison of Avalara vs TaxJar vs Vertex for NetSuite + QuickBooks.