The IDV Pinch Point Is Now: Why September Is the Real ECCTA Deadline for Thousands of UK Companies

18 November 2026. That date has been repeated in every briefing note, every accountancy newsletter, every Companies House guidance page for the better part of a year. It is also, for a meaningful slice of UK companies, entirely irrelevant as a planning target, because their real identity verification deadline falls somewhere in September, October or November, tied to their own confirmation statement anniversary. For those companies, the crunch is not approaching. It is here.

The Mechanics Most Directors Have Not Read

Under the Economic Crime and Corporate Transparency Act 2023 (ECCTA), identity verification (IDV) became mandatory for new directors and PSCs from 18 November 2025. Existing directors were given a twelve-month transition period, but the transition is not a single national event. It is a rolling obligation tethered to each company's confirmation statement date. A company cannot file its CS01 until all of its directors have supplied a verified personal code. The 18 November 2026 date marks when the transition period ends wholesale; it does not mark when your company's window closes.

The maths is uncomfortable. Confirmation statement dates are spread roughly evenly across the calendar year, meaning approximately one-twelfth of all UK companies have a filing falling in each month of autumn. Companies House estimates that six to seven million individuals fall into the director and PSC groups in scope. Every one of them who has concluded that "November is the deadline" and filed the thought away for later is now on borrowed time if their company was incorporated in any month with an anniversary between now and mid-November.

There is a further trap embedded in the mechanics. One unverified director blocks the entire confirmation statement. An unreachable co-director, whether travelling, on a changed email address, or carrying an expired passport, becomes a compliance event for the whole company. Practitioners who have been processing these filings since the mandatory regime began in November 2025 will recognise the pattern: a statement that once took four minutes now routinely stalls on a director who has not opened the GOV.UK One Login invite.

What This Means for Your Monday Morning

If your firm acts as company secretary or prepares confirmation statements for a client portfolio, the immediate task is a sweep of every company with a statement due before 19 November 2026. For each one, establish whether every director and PSC holds a valid personal code. Verification via GOV.UK One Login takes roughly ten minutes and is free, but it requires a valid photographic identity document, and the process cannot be accelerated if that document is missing or expired.

The presenter and agent verification regime, covering accountants, formation agents, and company secretaries filing on behalf of clients, has been pushed back to no earlier than November 2026, which removes one immediate pressure point for practices. The Companies House IDV transition for directors and PSCs, however, remains firmly on schedule. Enforcement activity is expected to ramp up from the end of 2026 onwards.

Failure to verify is not a civil penalty. It is a criminal offence: the director, the PSC, and the company itself can each face prosecution. That is not the sort of outcome that resolves itself through an amended filing.

The SIC 2026 Subplot Nobody Wants to Think About Yet

Waiting in the wings, though not yet operational, is the SIC 2026 reclassification. The ONS published the new Standard Industrial Classification framework formally in July and August 2026, explicitly recognising AI-related activities and separating general-purpose AI software from broader software categories at the five-digit level. Companies House has not yet announced a mandatory adoption date, but the precedent from the SIC 2003-to-2007 transition suggests a parallel acceptance period starting in late 2026 or early 2027, with mandatory adoption following in 2027 or 2028. The update to codes will, when it comes, flow through the confirmation statement, the same vehicle now carrying the IDV obligation. Practices already helping clients tidy their SIC classifications ahead of the eventual transition are doing so by filing an updating CS01, which carries no additional fee if the annual payment period is already settled.

For legal services and company secretarial businesses, those operating under Nice Class 45 and SIC codes 69.10 and 82.11, the trademark angle is worth noting. AIBD analysis of IPO Trade Mark Designations data shows 1,659 Class 45 filings in Q3 2026, up 4.2% on the prior period, suggesting that professional services brands are continuing to protect their names even as the regulatory overhead they manage grows heavier. The Nice Classification's 13th Edition, which entered force on 1 January 2026, now expressly recognises notarial services within Class 45: a small but precise change that matters to any firm reviewing or extending its trademark portfolio.

The Workflow, Step by Step

Step 1. Pull every client with a confirmation statement due date between today and 18 November 2026. Companies House's own register search shows the review period end date against each company.

Step 2. For each company, establish the IDV status of every director and PSC. If you have ACSP status, you can access this through the ACSP dashboard. If not, the director must supply their personal code directly.

Step 3. Issue written confirmation requests to any unverified individuals immediately, not when the statement is due. Build in at least three weeks for the postal-address edge cases, expired-document scenarios, and the director who does not read email until they land from a long-haul flight.

Step 4. Check SIC codes while you are in the filing. Companies House's guidance published in May 2026 asked companies three specific questions: are you trading, does your code reflect that, and has your activity changed? A wrong code on the register is not currently a penalty matter, but it affects lender and investor due diligence, and it will matter more once SIC 2026 codes become mandatory.

Step 5. File the CS01. Pay the £50 online fee (paper remains £110; this is not an occasion for paper). Retain the filing confirmation.

The Number That Concentrates the Mind

Companies House estimated the IDV reform involves checking the identity of more than seven million individuals, a figure described in official transition planning as the largest change to UK company law in over 150 years. The register has never been cleaned at anything approaching this scale. The practical implication for the compliance profession is that the workload is not theoretical: it is sitting in client portfolios right now, distributed across confirmation statement dates that fell or will fall throughout 2026.

Procrastination has a deadline. For a significant number of companies, that deadline is this month.

Next Deadline on the Horizon

18 November 2026. The absolute end of the IDV transition period for all existing directors and PSCs. After that date, Companies House's enhanced enforcement powers, including the ability to query and reject filings and to strike companies off the register, are expected to be applied with considerably less patience. Practices that have cleared their portfolios by end of October will be in a comfortable position. Those who have not will be making telephone calls they would rather not make.