Sales tax, VAT, and GST punish businesses for not noticing things: a nexus threshold crossed in a state you barely sell into, a rate change, a filing deadline in a jurisdiction you registered in last year. Automation here is about continuous surveillance, and it is where AI agents have moved fastest from demo to production — Avalara launched Avi in November 2025 as a network of agents handling determination, filing, exemption certificates, and registration.
The market splits cleanly. Incumbents (Avalara, Vertex) sell breadth and ERP depth to enterprises; AI-native challengers (Kintsugi, Numeral, Anrok, Sphere) sell speed of setup to software companies — and Vertex hedged by investing in Kintsugi in 2025.
Frequently asked
- What is economic nexus and why does software track it?
- Nexus is the connection that obliges you to collect sales tax in a jurisdiction, and economic nexus triggers on sales volume or transaction counts rather than physical presence. Thresholds differ by state, so software monitors your sales against every threshold continuously and warns before you cross one.
- Do SaaS companies need to charge VAT internationally?
- Frequently yes — digital services are taxable in most VAT jurisdictions, often from the first sale with no registration threshold for non-resident sellers. This is why SaaS-focused platforms like Anrok and Sphere cover registration as well as calculation.
- What do AI agents do in sales tax compliance?
- They monitor government portals for notices and rule changes, categorise products for taxability, prepare and file returns, and escalate exceptions. Numeral's agents check portals daily while human tax experts prepare the filings.