Every stage of VAT, automated.
Assessment, registration, determination, and filing across 103+ jurisdictions, in one platform.
AI engine
Assessment, registration, determination, and filing across 103+ jurisdictions, in one platform.
AI engine
How it works
Describe the transaction
Plain language input
Describe the transaction in normal language. No tax codes or technical knowledge needed.
↓
VAT treatment stored
AI classifies the transaction and saves the VAT coding to your account.
ERP data flows in
Raw transaction data
Your ERP sends transaction records via API in its native format.
ERP-specific data returned
Translated and formatted
Correct VAT coding returned in the exact format your ERP expects.
Legacy engines map a static tax code to a row in a table maintained by analysts. Ours reads the actual transaction in context (description, customer location, supply type) and classifies it with the rule cited. Reverse charge, OSS, IOSS, OIDAR, place of supply, all handled.
NetSuite, SAP S/4HANA, Microsoft Dynamics 365, Xero, QuickBooks, Sage Intacct, Stripe Tax. Tax codes come back in the exact format each system expects. No spreadsheets, no field mapping, no professional services contract.
The Compliance subscription bundles registration, the tax engine, monitoring, and all filings into one monthly price. EU OSS counts as a single jurisdiction covering all 27 EU countries. $79 per jurisdiction above 10. No demo, no minimum, no implementation fee. Avalara starts at $200+ a month after a sales call. Vertex starts at $400+. We tell you the price up front.
A short read for buyers comparing tax engines. Open the section below for the full breakdown and side-by-side feature comparison against Avalara, Vertex, and Fonoa.
Choosing the best VAT automation software comes down to three things: accuracy, fit with how you already work, and total cost of compliance. Legacy tools like Avalara and Vertex were built when SaaS businesses were the exception. They rely on static tax-code tables maintained by analyst teams, meaning every new product type or jurisdiction requires a support ticket and a wait. DeterminedAI was built differently — an AI engine reads the full transaction context and maps it to deterministic VAT rules across 103+ jurisdictions in real time.
Use DeterminedAI standalone or alongside the systems you already run. It plugs into NetSuite, SAP S/4HANA, Microsoft Dynamics 365, Xero, and QuickBooks Online via native connectors that return tax codes in the exact format each system expects — and it works just as well for teams running on Stripe, Shopify, custom billing stacks, or a spreadsheet-driven close. No professional services engagement, no field mapping, no spreadsheet hand-off.
Beyond determination, the best VAT automation software should also handle the full compliance lifecycle: knowing where you owe, registering in the right jurisdictions, and filing returns on time. DeterminedAI is the only platform that covers all four stages, Exposure → Registration → Determination → Filing, in a single workflow. The Compliance subscription bundles all four at $99 per jurisdiction per month (Starter, 1 to 10 jurisdictions) or $79 per jurisdiction per month (Growth, 10+ jurisdictions), with EU OSS counted as one jurisdiction.
| Feature | DeterminedAI | Avalara | Vertex | Fonoa |
|---|---|---|---|---|
| AI transaction classification | ✓ | ✗ | ✗ | Partial |
| Native ERP integrations (7) | ✓ | ✓ | ✓ | ✗ |
| EU OSS registration + filing | ✓ | Partial | ✗ | ✗ |
| Starting price / month | $99 per jurisdiction (EU OSS = 1) | $200+ | $400+ | Custom |
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All-in compliance, priced per jurisdiction.
One price per jurisdiction, billed monthly. Registration, calculation, monitoring, and filings, all in. EU OSS counts as one jurisdiction (covers all 27 EU countries).
Auto-filed today: EU OSS, UK, Norway, Australia, New Zealand, Singapore, Canada (federal GST/HST), Ireland, Poland. Coming soon: Germany, France, Netherlands, Spain. Pack + instructions: Switzerland, Iceland, Korea, Taiwan, Malaysia, Thailand, Turkey, Indonesia, Vietnam, Japan, Philippines.
Yes. If you sell digital services (SaaS, downloads, cloud subscriptions) to EU consumers (B2C), you must register for VAT on the very first sale. There is no turnover threshold for non-EU sellers. The Non-Union OSS scheme lets a single registration cover all 27 member states with one quarterly return.
Non-Union OSS is an EU VAT simplification for businesses established outside the EU. Instead of registering for VAT in every EU member state where you have customers, you register once (typically in Ireland via ROS) and file a single quarterly return covering all EU B2C supplies. DeterminedAI automates both the registration and the quarterly filings.
For B2C digital services, you charge the VAT rate of the customer's country (the "destination principle"). Standard rates range from 17% (Luxembourg) to 27% (Hungary). For B2B sales to a VAT-registered business, the reverse-charge applies. You do not charge VAT, but you must validate the buyer's VAT number via VIES.
Legacy engines (Avalara, Vertex) rely on static rule tables and manual tax code mapping. DeterminedAI uses AI to characterize each transaction in context, then applies deterministic tax rules, faster onboarding, broader coverage, lower cost. Fonoa focuses on e-invoicing; DeterminedAI focuses on VAT determination plus end-to-end OSS compliance for US SaaS. See full comparison →
Yes. Our free Exposure Dashboard reads your Stripe transactions to surface which jurisdictions you've crossed registration thresholds in. Paid plans use the same feed to calculate VAT owed per EU member state and auto-file your quarterly OSS return.
Irish Revenue grants OSS registration effective from the first day of the quarter in which you submit the application. They do not backdate. Any EU B2C sales before your effective date fall outside OSS and may need separate resolution, DeterminedAI surfaces this gap during the wizard.
NetSuite (SuiteTax), Xero, Sage Intacct, QuickBooks Online, Microsoft Dynamics 365, and SAP S/4HANA. We also expose a Raw API that accepts standard transaction payloads and returns ERP-ready tax codes for any system.