Avalara

1099 & W-9 API

The Avalara 1099 and W-9 API automates collection, validation, and e-filing of IRS forms including 1099 variants, 1095 forms, W-2, and 1042-S, providing endpoints for creating, updating, and managing various IRS forms for US and foreign companies.

Documentation GitHub OpenAPI

Documentation

📖

Documentation

https://developer.avalara.com/api-reference/avalara1099/avalara1099/

Specifications

⚙

OpenAPI

https://raw.githubusercontent.com/api-evangelist/avalara/refs/heads/main/openapi/avalara-1099-w9-openapi.yml