A practical guide to the UK compliance year
The UK compliance calendar runs across HMRC, Companies House, the FRC's accounting frameworks, UKIPO and TPR — each on its own cycle. Compared to most jurisdictions the UK system is highly digital, highly real-time and highly enforced. Below is the rhythm we plan UK engagements around, plus the two big shifts of the current cycle: Companies House identity verification and the continued roll-out of Making Tax Digital.
The Companies House ECCT Act overhaul — biggest UK corporate change in decades
The Economic Crime and Corporate Transparency Act 2023 is the most significant change to Companies House in a generation. Companies House is moving from a passive document repository to an active regulator with the power to query, reject and remove filings. Identity verification is now being rolled out for all directors, PSCs, and people filing on behalf of companies. Verification can be done through GOV.UK One Login directly or via an Authorised Corporate Service Provider (ACSP). Failing to verify in time will block director appointments, attract penalties, and ultimately disqualify directors. We help clients verify identity correctly, register the right ACSP route where useful, and time appointments so filings are not delayed.
Making Tax Digital — VAT is settled, ITSA is the next wave
MTD for VAT has been mandatory for almost all VAT-registered businesses for some years now — quarterly digital submission via MTD-compatible software, with digital record-keeping requirements running below the surface. The next phase is MTD for Income Tax Self Assessment (MTD ITSA), being phased in from April 2026 for self-employed individuals and landlords above prescribed turnover thresholds. Under MTD ITSA, taxpayers will file quarterly updates to HMRC, plus a final declaration, instead of a single annual Self Assessment return. The change affects how clients keep records, what software they use, and when their accountant is involved during the year. We are migrating clients onto Xero, QuickBooks or FreeAgent ahead of their MTD ITSA start date.
Self Assessment SA100 — the January cliff edge
The 31 January online filing deadline is the most punishing date in the UK tax calendar. £100 immediate penalty for missing it, escalating at 3, 6 and 12 months, plus tax-geared penalties for late payment. Payments on account fall on 31 January and 31 July. The October paper deadline catches some non-residents off guard. We start client SA100 work in October-November after the tax year ends 5 April, and clear the bulk by mid-January to avoid the rush.
Corporation Tax CT600 — pay before you file
The CT600 cycle has a peculiarity that catches directors out: tax payment is due 9 months and 1 day after year-end, but the return itself is not due until 12 months. So you pay first, file later. Companies House accounts have their own 9-month filing deadline (private companies) which usually drives the CT600 timetable anyway. Late filing of accounts attracts Companies House penalties separately from any HMRC penalties — they stack. We track both deadlines centrally for every corporate client.
PAYE & RTI — real-time, every payroll
UK payroll is real-time. Every Full Payment Submission must be filed on or before the pay date — late RTI submissions attract penalties from the first month. P60s to employees by 31 May, P11D benefits in kind by 6 July, Class 1A NIC payment by 22 July. Auto-enrolment workplace pensions sit alongside PAYE but are overseen by TPR separately. We integrate payroll, pensions and HMRC into a single monthly cycle.
VAT under MTD — quarterly and quietly demanding
Quarterly VAT returns under MTD might look simple but the digital links requirement (data flowing from source records to the return without manual re-typing) trips up businesses that still rely on spreadsheets in the middle. HMRC enforcement on digital links has intensified. We migrate clients to fully linked digital systems where they are not already there.
UKIPO trademarks — speed plus the 2026 fee jump
UK trademark applications are unusually fast compared to most jurisdictions — 4 to 6 months in a smooth case. Plan for the average 25% UKIPO fee increase that took effect 1 April 2026 (the first major adjustment in nearly thirty years for trademarks). Renewals can be filed up to 6 months early — for portfolios facing renewals around the fee change, early renewal could have been worthwhile. We monitor renewals 12 months ahead.
How we work with you
Our typical UK engagement combines monthly bookkeeping in Xero or QuickBooks with quarterly VAT under MTD, year-end accounts (FRS 102 / FRS 102 section 1A / FRS 105 depending on size), CT600, directors' SA100s, and ad-hoc Companies House filings. For overseas Britons we set up a secure document folder and handle UK filings end-to-end including NRL approvals. Where engagements require statutory audit, regulated tax appeals, or other services restricted to UK Registered Auditors or Chartered Tax Advisers, we coordinate with vetted UK-based counsel.