Complyt
Complyt is a sales tax engine for calculating tax on business transactions, available through an API and web platform.
What Complyt is
Complyt is a sales tax engine for calculating tax on business transactions, available through an API and web platform. Its API accepts transaction details such as line items, shipping addresses, and status, then returns a calculated sales tax amount and applicable rate. US rate lookup uses a supplied address and currently supports US addresses only; documentation also describes VAT and global tax support for international transactions. Businesses can create customers and transactions through the API. Customer categories—retail, reseller, and marketplace—can affect taxability and nexus thresholds. Estimates do not count toward nexus thresholds, while invoices do. Complyt includes nexus monitoring and an endpoint for managing exempt customers. Its Address Validation API checks US addresses against official postal databases and returns suggested matches with confidence scores. The integration with Xero calculates line-level US sales tax based on jurisdiction, nexus, exemptions, and product type; it calculates tax only when the invoice's shipping or billing address is in the United States, and recommends complete addresses. API access uses a client ID and secret to obtain a bearer token that expires after 24 hours. Pricing is available on request.
Good
- Returns calculated sales tax and applicable rates.
- Supports customer categories and exemption management.
- Includes US address validation with suggested matches.
- Xero integration calculates line-level US sales tax.
Watch out
- US sales tax rate lookup supports US addresses only.
- Bearer tokens expire after 24 hours.
- Pricing is available on request.
- Xero tax calculation requires a US shipping or billing address.
Who it suits
Complyt suits businesses in SaaS, e-commerce, retail, and professional services that need transaction tax calculations or nexus-related workflows. It may also fit Xero users handling US invoices with complete US addresses.
Verdict
Complyt offers API-based tax calculations with customer, exemption, nexus, and address workflows, plus a Xero integration. Confirm the address requirements and request pricing before selecting it.
The facts
Each one read from Complyt's own pages, with the date it was checked.
What it does
- Address validation
- The Address Validation API checks U.S. addresses against official postal databases and returns suggested matches with confidence scores.checked 9 Oct 2026
- API access
- Protected API requests require a bearer token in the Authorization header.checked 9 Oct 2026
- API response detail
- Transaction retrieval can return a simplified response or expanded details including item, tax-rate, and jurisdictional-rule fields.checked 9 Oct 2026
- Authentication
- The API uses client ID and client secret credentials to obtain an Auth0 bearer token that expires after 24 hours.checked 9 Oct 2026
- Customer records
- Customer types include retail, reseller, and marketplace, and customer type can affect nexus thresholds and taxability.checked 9 Oct 2026
- Customer types
- The engine recognizes retail, reseller, and marketplace customer types, which can affect nexus thresholds and taxability.checked 8 Oct 2026
- Exemptions
- Users can upload customer exemption documentation in the platform so Complyt excludes that customer from tax calculations.checked 9 Oct 2026
- Integration workflow
- The transaction guide shows creating a customer and transaction through Complyt's API.checked 8 Oct 2026
- Nexus thresholds
- The transaction guide distinguishes estimates, which do not count against nexus thresholds, from invoices, which do.checked 8 Oct 2026
- Pricing
- The opened official pages do not state a product subscription price.checked 9 Oct 2026
- Product
- Complyt provides a sales tax engine for calculating sales tax on transactions.checked 9 Oct 2026
- Supported users
- The company profile describes Complyt as serving businesses in SaaS, e-commerce, retail, and professional services.checked 8 Oct 2026
- Tax calculation
- The API returns a calculated sales tax amount and the applicable rate.checked 9 Oct 2026
- Transaction support
- The API supports creating transactions and records fields such as line items, shipping addresses, and transaction status.checked 9 Oct 2026
- US sales tax rates
- The sales tax rates endpoint returns a rate based on a supplied address and currently supports addresses in the United States only.checked 8 Oct 2026
- VAT and global tax
- The documentation describes support for VAT or global tax on international transactions.checked 8 Oct 2026
- Xero address requirement
- Complyt calculates tax for Xero invoices only when the shipping or billing address is in the United States, and recommends complete addresses.checked 9 Oct 2026
- Xero integration
- Complyt’s Xero app adds a tax rate that triggers line-level calculations based on jurisdiction, nexus, exemptions, and product type.checked 9 Oct 2026
