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Deadline guides for UK accountants

Plain-English guides to every compliance deadline an accountancy practice tracks – Companies House, Corporation Tax, Self Assessment, VAT, MTD, charities, pensions and AML.

10 guides32 minutes of readingReviewed October 2026

Annual accounts filing deadline at Companies House: a practical guide for UK accountants

How the Companies House accounts deadline is worked out for first and subsequent periods, what happens when a year end changes, the late filing…

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Confirmation statement deadline: when it is due and how to stay compliant

The 12-month review period, the 14-day filing window, what happens if a confirmation statement is late, and how identity verification for directors now ties…

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Corporation Tax payment deadline: 9 months and 1 day explained

When Corporation Tax must be paid, why the payment is due before the return, how quarterly instalments work for large companies, and what late…

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CT600 return filing deadline and late filing penalties

The 12-month CT600 deadline, how it differs from the payment date, the escalating penalties for late returns, and the pitfalls with long first accounting…

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Self Assessment deadlines: returns, payments on account and penalties

Every Self Assessment date a practice needs – registration, paper and online returns, balancing payments and payments on account – plus the penalty regime…

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VAT return deadlines: one month and seven days, and the points-based penalties

When quarterly and monthly VAT returns and payments are due, how the points-based late submission penalties work, the late payment charges, and how to…

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Making Tax Digital for Income Tax: quarterly update deadlines for sole traders and landlords

Who is in MTD for Income Tax from April 2026, the standard and calendar quarter dates, when each quarterly update is due, and how…

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Charity Commission annual return deadline: what charities must file and when

The 10-month deadline for charity annual returns, accounts and trustees' reports, the income thresholds that decide what is filed, and how charitable companies have…

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Auto-enrolment re-enrolment and re-declaration of compliance: the three-year deadline

Why every employer must re-enrol staff and re-declare to The Pensions Regulator every three years, how the re-enrolment date and the 5-month declaration deadline…

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AML client reviews: how often accountants should refresh customer due diligence

What the Money Laundering Regulations require on ongoing monitoring, how to set a risk-based review cycle for each client, the triggers that mean a…

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