Address-level tax precision
Move beyond ZIP-based estimation with jurisdiction-aware rates for accurate checkout calculations.
Trusted Sales Tax Infrastructure
Enterprise-grade sales tax API for modern commerce platforms
Deliver accurate rooftop-level tax determination, reduce compliance risk, and scale across every U.S. jurisdiction with confidence.
13,000+
tax jurisdictions covered
85ms
average response time
99.95%
API uptime SLA
24/5
technical support coverage
Platform Capabilities
Built for finance, engineering, and tax teams
SalesTaxIQ combines high-performance tax determination with controls enterprise teams need to stay compliant at scale.
Compliance-first operations
Daily rate refreshes and clear tax authority breakdowns help teams stay audit-ready across channels.
Developer-ready integration
Simple REST endpoints, clear examples, and predictable response formats shorten implementation time.
Built for high-volume commerce teams
Marketplaces
Omnichannel Retail
Subscription Commerce
ERP Platforms
Payment Providers
Calculate Accurate Sales Tax Rates
Preview live jurisdiction-level rates and evaluate API output before integrating into production.
Enter Address for Tax Calculation
Tax Rate Results
| Tax Authority | Rate |
|---|---|
| Washington State | 6.512% |
| Washington, Whatcom County | 1.700% |
| Washington, Whatcom County Uninc Ptba District | 0.600% |
Total combined sales tax rate:
8.812%
Trust and Reliability
Controls and support for enterprise operations
Security Program
Encrypted transport, scoped access controls, and operational safeguards built for regulated environments.
Performance Monitoring
Continuous platform monitoring and alerting to maintain low-latency tax determinations.
Clear Audit Trail
Detailed rate components and tax authority attribution to support reconciliation and reporting.
Dedicated Support
Implementation guidance and escalation paths for teams running critical checkout workloads.
Implementation outcomes your stakeholders care about
Fewer checkout tax disputes from precise jurisdiction calculation
Faster implementation cycles with clear docs and predictable API behavior
Improved audit readiness with transparent tax authority breakdowns
Reliable tax determination performance as transaction volume grows