Free plan — up to 5 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.

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

Already signed up? Manage your account →