How deadlines are calculated.

ComplyClock combines Companies House register data with the tax profile you enter for each entity.

These summaries explain how ComplyClock generates dates in the app. They are not tax, accounting, or legal advice, and you remain responsible for checking filings and payments before acting.

Companies House accounts

Uses the annual accounts next due date returned by Companies House for the company number on the entity.

Confirmation statements

Uses the confirmation statement next due date returned by Companies House and tracks the filing fee separately where applicable.

Corporation Tax payment

Uses the Corporation Tax period end from the entity profile, or the Companies House accounting reference date when available, then adds 9 months and 1 day.

Company Tax Return

Uses the same Corporation Tax period end and tracks the CT600 deadline 12 months after that period end.

VAT returns

Uses the selected VAT frequency. Monthly and quarterly VAT are tracked 1 month and 7 days after the period end; annual accounting is tracked 2 months and 7 days after the annual period end.

PAYE payments

Uses the selected PAYE frequency and tracks payment dates on the 22nd of the relevant month.

Self Assessment

Tracks the online return and first payment on account on 31 January, plus the second payment on account on 31 July.