Sub-national Tax
What it does
Calculate state, province, and regional tax rates accurately. Many countries have multi-level tax systems where national, regional, and local taxes stack. POTAL handles the complexity of sub-national taxation for the US, Canada, Australia, Brazil, India, and more.
How to use it
Provide location
Include state/province code or postal code in your tax calculation request.
Check combined rate
The response shows the combined rate broken down by jurisdiction level.
Handle exemptions
Some states exempt certain product categories — POTAL applies these automatically.
Multi-jurisdiction
For marketplace sellers, check nexus rules to determine where you need to collect.
API Reference
/api/v1/tax/us-sales-taxRelated Features
ZIP-level US sales tax with nexus rules and marketplace facilitator
Calculate VAT, GST, and sales tax for 240 countries and territories
Manage and apply tax exemption certificates per jurisdiction
Get the full import cost including duties, taxes, fees, and shipping
Apply DST rates for digital goods and services across jurisdictions