About FlashBill

Built in the UK, for the UK trades.

Why we built this

UK tradespeople — electricians, plumbers, builders, roofers, subcontractors — spend hours every week dealing with invoices, CIS deductions, VAT calculations, and chasing late payments. Most invoicing tools are built for accountants or office workers, not for someone finishing a job on a building site.

FlashBill was built to fix that. Send a professional, HMRC-compliant invoice in under 60 seconds — CIS and VAT calculated automatically, payment link included, from your phone.

What we stand for

🇬🇧 UK-built & hosted
🔒 AES-256 encryption
⚡ Invoice in 60 seconds
£0 Free to start

Who it's for

  • 🔧 Sole traders and self-employed contractors
  • 🏗️ CIS subcontractors and subbies dealing with deductions
  • ⚡ Electricians, plumbers, builders, plasterers, roofers
  • 📋 Anyone tired of spreadsheets and manual invoicing
  • 💼 Small construction businesses who need CIS statements for their accountant

What makes FlashBill different

  • CIS-native: All 6 CIS × VAT combinations (TC-01 to TC-06) calculated automatically — including the domestic VAT reverse charge.
  • Late Payment Act: Generate statutory Late Payment notices with legally correct interest calculations in one click.
  • Client portal: Clients can view, approve and pay invoices without needing a FlashBill account.
  • Works offline: Install as a PWA on your phone. Create invoices even without signal — syncs when you're back online.
  • Accountant-ready: CSV and Xero-compatible exports, CIS Statement PDFs, and a read-only accountant portal link.

Who's behind it

FlashBill is built and operated by a UK-based independent developer who saw first-hand how much time tradespeople waste on paperwork that should take minutes.

We're not a big corporation with a VC-funded growth team. We're a small, focused product that cares deeply about building something genuinely useful for the people who keep the UK's construction industry running. Every feature we ship solves a real problem a real tradesperson told us about.

Our promise

  • ✅ We will never sell your data
  • ✅ We will never show you ads
  • ✅ We will always reply to support emails within 24 hours (Mon–Fri)
  • ✅ Your invoice records are retained for 6 years as required by HMRC — even if you cancel
  • ✅ UK GDPR compliant — your data stays in Europe

Get in touch

Questions, feedback, or just want to say hello?

Start for Free → Get in Touch