Starter plan — up to 50 companies

Never miss a client filing deadline

Add your clients below — by company number, name search, or bulk CSV import. PenaltyProof checks Companies House every morning and emails you before any deadline is missed.

No credit card 2-minute setup Official Companies House data

Filing alerts land here. Privacy Policy.

Drop your client list here
CSV, TXT, or Excel export — one company number per line, or comma-separated
or

Select from results to add the company number automatically.

Press Enter or Space to add. Click × to remove.

Tip: Start with your highest-risk clients — companies with deadlines in the next 30–60 days get an alert tomorrow morning.
As a customer you'll also get occasional product tips and updates (one-click unsubscribe in every email).

By clicking Start monitoring, you agree to our Terms of Service and Privacy Notice.

What happens next
1. Confirm your email — one click, arrives within seconds.
2. We check Companies House overnight for every client you've added.
3. You get an alert at 07:00 GMT/BST — or an all-clear if nothing's due soon.

Example alert email

Example PenaltyProof filing deadline alert email

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