End-to-end sales tax infrastructure.
Real-time calculations, nexus tracking, registrations, filings, remittance, and notices—managed through a single integration.
Explore the sales tax APICalculationNexusFilingsNoticesYour platform
Platform Partnerships
Sales tax infrastructure your platform can build on.
A fully managed sales tax engine built for accuracy, scale, and deep integration.
Calculations1.2M todayPending200 OK
Client registrations640 this yearSubmittedApproved
Filing statusShown in-productSyncingReal time
Clients on Zamp212Registrations, filings and notices handled
Client registered in TexasShown in your product · just now
Supporting high-growth digital businesses on leading platforms
Supporting high-growth digital businesses on leading platforms
Why platforms build on Zamp.
Production-grade accuracy.
Jurisdiction-level tax calculations using sourcing rules, product tax codes, exemptions, tax holidays, and registration context.
Explore sales tax calculationPOST /calculations{ "shipTo": "400 Pine St, Seattle, WA", "items": [{ "taxCode": "SW050000", "amount": 49 }], "exempt": false }
ResponseDestination sourcing · no holiday.Tax returned
{ "tax": 5.17, "rate": 0.1055, "sourcing": "destination", "holiday": false, "breakdown": { "state": 3.19, "local": 1.98 }, "taxCode": "SW050000", "jurisdictions": 4 }
Continuously maintained tax content.
Rates, boundaries, and rule changes maintained in-house by Zamp’s content team as regulations evolve.
Explore sales tax calculators| Change | Jurisdiction | Effective | Status |
|---|---|---|---|
| Rate updateCity rate | Denver, CO | Jan 1 | ReviewScheduled |
| New boundaryAnnexation | Austin, TX | Oct 1 | ReviewApplied |
| Rule changeDigital goods | Washington | Oct 1 | ReviewApplied |
| HolidayBack-to-school | Florida | Aug 1 | ReviewScheduled |
Rate update · ScheduledUpdated by Zamp just now
Embedded compliance experiences.
Expose registrations, filings, reports, and compliance status directly inside your platform via API.
Explore the API integrationEmbedded compliance · via API
3,840filings shown in-product
Filings shown in-product · last 12 months
- Clients212
- Registrations640
- Notices38
- StatusReal time
Through the Zamp API, inside your product
Status in real time
See Zamp on your own states.
Bring your states and systems. A sales tax specialist will show you exactly what Zamp takes over.
What platform partners get.
Sandbox and production API access for testing, validation, and rollout.
Dedicated technical partner support throughout integration and launch.
Shared success partner model with no upfront costs and recurring commissions.
Early access to new endpoints, features, and expanded compliance coverage.
Zamp Certified partner designation for production-ready integrations.
Zamp has been a great support to our clients exploring the U.S. markets. the team has always been attentive and up for collaboration to explore further growth together.