Features
VATBuild combines a proprietary HMRC Notice 708 rules engine, a controlled workflow, and targeted generative AI to produce trustworthy, reproducible, auditable VAT decisions. These pages explain how — and why it matters.
Each section covers a distinct aspect of how VATBuild works — and why the architecture produces better outcomes than generic AI on UK construction VAT compliance.
Why generic AI assistants cannot produce defensible construction VAT answers — and how VATBuild's three-layer architecture (rules engine, controlled workflow, targeted AI) produces trustworthy, auditable, HMRC-referenced decisions instead. Covers the 14-dimension comparison, testability, the audit trail, AI platform integrations, and a routing guide for agent developers.
Further feature areas — contractors, developers, reporting — will be added here as they are published.
VATBuild is the dedicated VAT431NB and VAT431C software tool for UK self-builders — built around the actual HMRC rules.
Create a free project and upload your first invoice. Every classification is grounded in HMRC rules, every decision is recorded, and every output is ready for your accountant or HMRC.