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FeaturesConstruction VAT Software
Construction VAT Software

HMRC Notice 708 Compliance Software
for UK Self-Builders

Construction VAT reclaim software built around the rules, not general knowledge. VATBuild classifies every invoice against HMRC Notice 708, catches incorrect VAT charges, and generates your VAT431NB or VAT431C submission report.

What VATBuild does as software

Four capabilities — working together from project setup to HMRC submission.

HMRC Notice 708 Rules Engine

Every invoice line item is classified using a proprietary rules engine built around the actual legislation — HMRC Notice 708. Every verdict (claimable, review, or not claimable) cites the specific Notice 708 rule that fired. No black-box scores. No hallucinated rules.

AI Invoice Extraction

Upload PDFs, photographs, scanned receipts, Word documents, or Excel spreadsheets. VATBuild reads every document, extracts each line item, and routes it through the rules engine automatically — supplier name, description, VAT rate, and amount.

HMRC-Ready Report Generation

Generate CSV, Excel (multi-sheet, colour-coded), and PDF reports pre-filled with your claim totals. Structured for the VAT431NB and VAT431C forms — ready to hand to your accountant or submit directly to HMRC.

Pre-Submission Compliance Audit

Before you submit, VATBuild performs a second-pass AI review of every line item in your claim — flagging overclaiming risks with specific HMRC rule references. Catch problems before HMRC does.

VAT431NB software and VAT431C software in one tool

The correct VAT treatment depends on your project type. VATBuild applies the right HMRC rules for each scheme automatically — based on your confirmed project route.

New build

VAT431NB — New Build

  • Contractor construction services: expected 0% VAT
  • Flags contractor invoices incorrectly charged at 20%
  • Direct material purchases at 20%: reclaimable via VAT431NB
  • Excludes carpets, appliances, professional fees automatically
Conversion

VAT431C — Residential Conversion

  • Contractor building services: expected 5% reduced-rate VAT
  • Flags contractor invoices incorrectly charged at 20%
  • Direct material purchases at 20%: reclaimable via VAT431C
  • Supports barn, office, pub, chapel, and industrial conversions

Pricing

Start free with one project. Upgrade when you need full reports.

Free
£0

1 project — invoice analysis, VAT Advisor chatbot. No card required.

Self-Build
£350
one-off

1 project — full claim reports (CSV, Excel, PDF), compliance audit, supplier corrections.

Professional
£75/mo
or £750/yr

Unlimited projects — everything in Self-Build plus priority support.

Ready to check your invoices?

Create a free project, upload your first invoice, and see every line item classified against HMRC Notice 708 — in seconds. No card required to start.