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- OpenTax by Invaro
On the recordRead 8 Oct 202614 facts
OpenTax by Invaro
Plans and prices
Evaluation
Free
No expiry · 600 requests/hour anonymous or 6,000/hour with a key
Read 8 Oct 2026 · opentax.invaro.ai
On the record
- Citations and proofs
- Tax rules include statutory citations and effective dates, and computations can return a Merkle-rooted proof for offline verification.opentax.invaro.ai · read 8 Oct 2026
- Data handling
- The docs say request facts are computed in memory and not stored; usage records retain limited metadata rather than request arguments.opentax.invaro.ai · read 8 Oct 2026
- Document processing
- A deterministic compiler converts W-2 and 1099 boxes and birth dates into engine facts.opentax.invaro.ai · read 8 Oct 2026
- Free evaluation
- The evaluation plan is free with no expiry; anonymous calls are limited to 600 requests an hour and a key raises the allowance to 6,000.opentax.invaro.ai · read 8 Oct 2026
- Integrations
- The hosted MCP connector is presented for assistants, IDEs, agents, and automation platforms; named examples include Claude, ChatGPT, Cursor, n8n, Zapier, and Make.opentax.invaro.ai · read 8 Oct 2026
- Intended users
- The maker describes use cases for tax and accounting firms, freelancers and S-corp clients, advisory engagements, and financial planners.opentax.invaro.ai · read 8 Oct 2026
- Interfaces
- The maker documents REST, MCP, and OpenAPI interfaces for the hosted service.opentax.invaro.ai · read 8 Oct 2026
- License
- The engine is offered under AGPL-3.0 with a commercial license also available.opentax.invaro.ai · read 8 Oct 2026
- Local use
- The maker offers an installable package combining an MCP server, CLI, and HTTP host, and says the HTTP server can be self-hosted.opentax.invaro.ai · read 8 Oct 2026
- Out-of-scope cases
- When the corpus cannot answer, the engine refuses with a reason instead of estimating.opentax.invaro.ai · read 8 Oct 2026
- Privacy telemetry
- The privacy page says the hosted MCP endpoint does not store or log tax facts, while the CLI and MCP package send an anonymous usage ping that can be disabled.opentax.invaro.ai · read 8 Oct 2026
- Purpose
- OpenTax is a deterministic tax computation engine designed to work beneath AI agents.opentax.invaro.ai · read 8 Oct 2026
- State coverage
- The maker says state coverage spans 29 states and is growing.opentax.invaro.ai · read 8 Oct 2026
- Tax forms
- It supports complete line sets for individual Form 1040, corporate Form 1120, and fiduciary Form 1041 returns.opentax.invaro.ai · read 8 Oct 2026
