TaxJar API
Sales tax automation API for US-based e-commerce. Calculates real-time sales tax rates, manages nexus, automates filing, and handles exemptions. Simpler and more affordable than Avalara for mid-market.
Best When
An agent needs straightforward US sales tax calculation and filing automation for an e-commerce business with multi-state nexus, at a more accessible price point than Avalara.
Avoid When
You need global VAT compliance or enterprise-scale international tax coverage.
Use Cases
- • Real-time US sales tax calculation for e-commerce checkout
- • Automated sales tax filing in states where nexus exists
- • Order-level tax reporting and categorization
- • Nexus determination for physical and economic nexus
- • Exemption certificate validation for B2B transactions
Not For
- • International VAT outside the US (limited international support)
- • Enterprise-scale businesses needing global tax coverage (use Avalara)
- • Non-US tax jurisdictions as primary use case
- • Income tax or payroll tax calculations
Alternatives
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Scores are editorial opinions as of 2026-03-01.