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In one sentence

PenaltyProof sends UK accountants and bookkeepers automatic email alerts before their clients' Companies House filing deadlines, so a missed deadline never costs a £150–£1,500 penalty.

Why this exists

UK limited companies face annual Companies House deadlines — confirmation statement and annual accounts. Miss either, and Companies House issues an automatic late-filing penalty: £150 to £1,500 per company, depending on how late. A 50-client practice can face £7,500+ in aggregate penalties in a single year.

Companies House sends one email on the morning a filing is due — not before it. Practice management software tracks deadlines in dashboards you have to remember to check. Spreadsheets don't auto-update when Companies House changes a date.

The gap: No tool existed that watched the register on the accountant's behalf and sent an advance email alert across every UK filing obligation, to every client on a list, automatically.

The transformation: An accountant moves from manually checking each client's Companies House page (or hoping a spreadsheet is current) to receiving an email the moment a deadline enters the 30-day window. One inbox. Every client. No action required until the alert arrives.

The market

  • 317,985 penalty notices issued by Companies House in 2024–25, most for late filing (CH Annual Report)
  • 9 million+ HMRC penalties issued across all taxes in 2024–25, up from 8 million the year before (HMRC Annual Report)
  • 780,000+ sole traders and landlords in scope for MTD ITSA from April 2026 — four quarterly updates plus a final declaration (GOV.UK)
  • Most UK sole-trader accountants and small practices have no dedicated advance-warning infrastructure for these filings

Factsheet

  • Founded: 2026, by Theo Chavannes (solo founder), under Chavannes Ltd (Company No. 17198260).
  • Based: United Kingdom.
  • What it does: Monitors Companies House filings (annual accounts, confirmation statements) for the user's client list and emails alerts at 30, 14, and 7 days before each deadline, plus on the day and after.
  • Who it's for: UK accountants and bookkeepers, especially solo and small practices managing 5–50 client companies.
  • Pricing: Free for up to 5 companies. Starter £29/month (50 companies). Pro £39/month (unlimited).
  • Data: Reads only the public Companies House Public Data API. Stores no client financials, only company numbers and filing due dates. UK GDPR‐compliant; ICO registered (Reg. No. ZC142025).

Brand assets

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Contact

For interviews, story pitches, or product enquiries: hello@penaltyproof.co.uk

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