API-first tax stack with real-time tax ID validation against 115+ registries, tax determination, and e-invoicing compliance.
Fonoa is an API-first tax automation platform built for digital businesses selling across borders. Its products cover the tax plumbing that global billing needs: validating customer tax IDs in real time against national registries, determining the right indirect tax treatment per transaction, generating locally compliant invoices, and reporting to tax authorities where mandates require it. Marketplaces, gig platforms, and high-volume SaaS companies use it as the tax layer their billing systems call at checkout and invoicing time.
Which of the capability map's modules Fonoa covers — each links to the module's own page, with every tool that supports it.
| Module | Phase | Depth | Note |
|---|---|---|---|
| Define What You Sell | |||
| Tax Setup & Rules | Design & Setup | Core | Per-country indirect tax determination logic delivered as an API. |
| Tax ID Validation | Design & Setup | Core | Real-time checks against 115+ national registries — the flagship product. |
| E-Invoicing Compliance | Design & Setup | Core | Locally compliant invoice generation and authority reporting where mandated. |
Where incumbents grew up serving US sales tax for ERPs, Fonoa is built developer-first and international-first — its tax ID validation coverage across 115+ government registries and its focus on e-invoicing and digital reporting mandates make it a fit for platforms with heavy cross-border volume. Everything is an API designed to sit inline in the transaction path, not a back-office batch job.
Avalara is the broad incumbent suite and Anrok is purpose-built for US-centric SaaS sales tax; Fonoa's center of gravity is international — real-time tax ID validation, per-country determination, and e-invoicing mandates for businesses with global transaction volume. Companies sometimes run Fonoa for cross-border flows alongside a US-focused engine.
Fonoa's core is transaction-time automation — validation, determination, invoicing, and digital reporting to authorities. Returns preparation and filing is a separate concern; check current product scope per jurisdiction, as reporting mandates and product coverage both move quickly.
By overlap on the capability map — computed, not curated.