Featured guides
The complete guide to Companies House filing deadlines
Annual accounts, confirmation statements, PSC obligations — every deadline, explained for UK accountants.
MTD ITSA 2026 rollout: what accountants need to know now
780,000+ clients enter scope. Five quarterly submissions per client, per year. Here's your prep checklist.
UK accountant's 2026 compliance deadline calendar
Every key filing date across Companies House, HMRC, payroll, and pension — by month.
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VAT return deadlines: the full picture for accountants
Standard and non-standard VAT periods, penalty points, and how to avoid the cascade.
RTI Full Payment Submission deadlines explained
When FPS must reach HMRC, what counts as late, and how penalty escalation works.
Self Assessment deadlines: a complete guide for agents
Paper vs online, payments on account, late filing penalties and how to appeal.
Pension auto-enrolment: the compliance calendar accountants miss
Re-enrolment, contribution increases, scheme certification — the obligations beyond setup.
ECCTA identity verification: what accountants must do now
ECCTA's new ID verification requirements and how they affect your clients' PSC filings.
The 7 most common PSC register mistakes accountants fix
Incorrect beneficial ownership thresholds, missed filings, superseded entries — and the real-world penalties.
Stop tracking deadlines manually
PenaltyProof monitors all of these deadlines automatically for every client on your list.