Category
AI tax compliance software: what they are and who makes them
sales tax filing services for us sellers, vat and invoicing tools for digital sellers, payment-platform tax add-ons, enterprise tax engines and bookkeeping services: Kintsugi, Zamp, TaxJar through Numeral.
Types of AI tax compliance software
Sales tax filing services for US sellers
Kintsugi, Zamp and TaxJar monitor nexus, register you in states and file returns. Prices range from a per-filing charge to monthly tiers, and AI mainly classifies products or sorts notices. They fit online stores and SaaS companies selling into many states.
VAT and invoicing tools for digital sellers
Quaderno, Taxually and Fonoa handle VAT, GST and e-invoicing for sellers with customers in the EU, UK and elsewhere. They put tax ID validation, invoice rules and reporting ahead of US filing, and they suit software companies and marketplaces that sell to buyers in many countries and need documents that tax authorities accept.
Payment-platform tax add-ons
Stripe Tax calculates tax inside Checkout, Billing and Invoicing and meters registration thresholds from payment data. It is the shortest path for companies already on Stripe, with no separate integration to build, while filing outside the US goes through partner firms and is priced by them rather than on the Stripe page.
Enterprise tax engines and bookkeeping services
Avalara and Vertex serve ERP-heavy companies with deep connector lists and governed AI, usually on quotes and long implementations. TAXDOO sits apart as a German service that pairs bookkeeping software with accountants who prepare monthly VAT returns for online sellers.
Facts at a glance
| Tool | Publisher | Based in | Access |
|---|---|---|---|
| Kintsugi | Kintsugi | United States | Free tier + API |
| Zamp | Zamp | United States | Free tier + API |
| TaxJar | TPS Unlimited, Inc. | United States | Trial |
| Quaderno | Recrea Systems, S.L. | Spain | Trial + API |
| Stripe Tax | Stripe, LLC | United States | Paid + API |
| TAXDOO | Accounting-digital-Unternehmensberatungsgesellschaft mbH & Co. KG | Germany | Paid |
| Avalara | Avalara, Inc. | United States | Paid + API |
| Vertex | Vertex, Inc. | United States | Paid + API |
| Fonoa | Fonoa | Ireland | Paid + API |
| Taxually | Taxually Kft. | Hungary | Paid + API |
| Numeral | Numeral Two, Inc. | Not stated on the vendor pages | Free tier + API |
