Every stage of VAT, automated.
An AI query system for any VAT/GST question, plus exposure monitoring, registration, and filing across 103+ jurisdictions, in one platform.
AI engine
An AI query system for any VAT/GST question, plus exposure monitoring, registration, and filing across 103+ jurisdictions, in one platform.
AI engine
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.
An AI Query System built on cross-border VAT/GST. Ask how to treat a transaction, what an invoice must show in a given country, when you cross a registration threshold, or how a return works, and get an advisor-grade answer with the rule that applied. Scoped to the jurisdictions you subscribe to, with every conversation saved.
The same AI that classifies transactions carries through to your returns. Upload a spreadsheet in any column layout and it maps the columns for you, or upload the actual invoice PDFs and it reads each line and reconciles the totals. Before you file, it reviews the draft and asks about anything that looks off, rows taxed in the wrong country, a missing rate, an empty box. You keep a record of every return generated.
The Compliance subscription bundles 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. Registration, in the jurisdictions where we offer it, is a separate one-time fee ($199 self-serve, $499 managed). 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, whether that is Stripe, Shopify, a custom billing stack, or a spreadsheet-driven close. No professional services engagement, 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, and the AI does not stop at determination. When it is time to file, you upload a spreadsheet in any column layout or the raw invoice PDFs; AI maps the data into the return, reviews the draft, and flags anything worth checking before you submit. The Compliance subscription covers determination, monitoring, and filing 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. Registration, where we offer it, is a separate one-time fee ($199 self-serve, $499 managed).
| Feature | DeterminedAI | Avalara | Vertex | Fonoa |
|---|---|---|---|---|
| AI transaction classification | ✓ | ✗ | ✗ | Partial |
| EU OSS registration + filing | ✓ | Partial | ✗ | ✗ |
| Starting price / month | $99 per jurisdiction (EU OSS = 1) | $200+ | $400+ | Custom |
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Ongoing compliance, priced per jurisdiction.
One price per jurisdiction, billed monthly. Calculation, monitoring, and filings, all in. Registration is a separate one-time service in supported jurisdictions. 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.
Registration (one-time, supported jurisdictions): $199 self-serve (we prepare a submission-ready pack and instructions) or $499 managed (we submit on your behalf and deliver the number). Billed once per registration, separate from the monthly subscription.
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 prepare your quarterly OSS return, which we file for you on ROS using your stored Digital Certificate.
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.