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.
Alongside invoice classification and claim reports, every VATBuild project includes three real-time tools that keep your VAT position accurate throughout the build.
Confirm and track whether each supplier's VAT registration has been checked before you pay. VATBuild records a timestamped verification against the supplier record — so your audit trail shows which VAT numbers were reviewed and when.
A built-in checklist of everything that needs managing throughout your project — completion certificates, supplier VAT records, claim deadlines, and more. Nothing falls through the cracks before you submit.
Track total spend by supplier and category in real time as invoices are uploaded. See exactly where the budget is going and what the VAT position looks like at every stage of the project.
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.