Sales tax that's always right.
One API for rooftop-accurate US sales tax — state, county, city and special districts, itemized in every response. No third-party tax vendor.
Rooftop accuracy
Address-level rates where data allows, official tables everywhere else.
Clear breakdown
Every layer itemized with a ready-to-display summary string.
Address autocomplete
Self-hosted US typeahead over ~204M addresses — each suggestion feeds straight into /tax.
Keys you control
Per-key limits, domain & IP locking, and one-click rotation.
Fast & cached
Quarter-aligned cache keeps responses quick and always fresh.
Simple, scalable pricing
Start free. Upgrade when you grow.
Free
Kick the tires — both APIs, no card needed.
- Tax lookups — 500/month
- Address autocomplete — 2,500/month
- 30 requests / min
- Lock to 1 domain / IP
Starter
For side-projects and new stores just getting going.
- Tax lookups — 5,000/month
- Address autocomplete — 25,000/month
- 60 requests / min
- Lock to 1 domain / IP
Basic
For a small shop or a low-traffic site.
- Tax lookups — 20,000/month
- Address autocomplete — 100,000/month
- 120 requests / min
- Lock to 2 domains / IPs
Growth
For a growing site with steady, moderate-to-high traffic.
- Tax lookups — 75,000/month
- Address autocomplete — 375,000/month
- 240 requests / min
- Lock to 5 domains / IPs
Business
For high-traffic sites that need serious volume.
- Tax lookups — 250,000/month
- Address autocomplete — 1,250,000/month
- 480 requests / min
- Lock to 10 domains / IPs
Scale
For very high usage and heavy API workloads.
- Tax lookups — 1,000,000/month
- Address autocomplete — 5,000,000/month
- 1000 requests / min
- Lock to 25 domains / IPs
Pay As You Go
No monthly fee — pay only for what you use, per feature.
Frequently asked questions
Everything you need to know about the TaxSearcher sales tax & address API.
What does the TaxSearcher sales tax API do?
It returns the full US sales-tax breakdown — state, county, city and special-district rates plus the combined total — for any US address or ZIP code, using official government data for all 50 states.
Which states are supported?
All 50 US states. Rates come from official state sources (rooftop rate APIs where available, and official rate/boundary data elsewhere).
Is there an address autocomplete API?
Yes. A built-in US address autocomplete suggests real street addresses as the user types, and each suggestion can be sent straight to the tax endpoint.
Is it free to start?
Yes — you can create a free account, get an API key, and start making calls immediately. Paid and pay-as-you-go plans are available as you scale.
Ship accurate tax today.
Create a free account and get your API key in under a minute.