> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://avalara.ferndocs.com/home/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://avalara.ferndocs.com/_mcp/server. # Home > API solutions for end-to-end tax compliance. > **Note:** This page contains both a page directory (above) and the landing page content (below). The page directory is generated for agent use and does not appear on the landing page. > For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://avalara.ferndocs.com/home/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://avalara.ferndocs.com/_mcp/server. # Build intelligent tax compliance workflows Integrate real-time tax calculation, e-invoicing, and end-to-end compliance into your product with Avalara’s REST APIs and SDKs. [Get Started ](/docs/ava-tax-quickstart-guides/calculate-sales-tax) [Explore the API ](/api-reference) Configure your IDE with MCP servers Discover Avalara APIs and\ capabilities Turn tax compliance use case into code 12,000+ Tax jurisdictions 190+ Countries supported 54B+ Transactions per year 200,000+ Customers ## Build your integration Choose how you want to connect — call the REST APIs directly or get started fast. [01](/api-reference) REST APIs Integrate directly with the AvaTax API for full control over calculation, transactions, and compliance. [02](/docs/ava-tax-quickstart-guides/calculate-sales-tax) Quickstart Authenticate, calculate tax on your first transaction, and commit it — in under ten minutes. `npm install avalara` calculate-tax.ts
200 OK totalTax *7.75* · rate *7.75%* · lines *1* ## One platform, several APIs Avalara's developer platform brings end-to-end tax compliance together in one suite of REST APIs — calculation, e-invoicing, exemption certificates, information returns, and more. Explore the capabilities below, then dive into any API from the reference. Calculations Real-time sales, use, and cross-border tax on every line of every order. AvaTax API. Exemption certificates Request, validate, and store exemption certificates tied to your customers. CertCapture API. Compliance data Manage companies, nexus, items, tax codes, and reports behind your filings. AvaTax API. E-invoicing Issue compliant e-invoices and meet live-reporting mandates. Avalara E-Invoicing & Live Reporting API. 1099 & W-9 Collect W-9s and file 1099s with built-in TIN matching and e-delivery. Avalara 1099 & W-9 API. Communications Calculate telecom, streaming, and utility taxes at scale. Avalara for Communications API. ## Ready to start building? Spin up a free Avalara sandbox and make your first API call today. [Read the docs](/docs) [Browse endpoints](/api-reference)