The Q4 2026 Compliance Calendar for Multi-Country Groups

Most compliance failures in international groups are not caused by ignorance of the rules. They are caused by nobody owning the calendar.

The final quarter of 2026 is unusually crowded. The UK's director identity verification regime ends its transition year, e-invoicing mandates are live or landing across a string of EU markets, and 2027 deadlines are close enough that systems work has to start now. For a group with entities in four or five countries, each obligation is manageable. Together, without a single owner, they are how penalties, blocked filings and frozen payments happen.

United Kingdom: Director Identity Verification

Companies House identity verification became a legal requirement on 18 November 2025 under the Economic Crime and Corporate Transparency Act. That date opened a twelve month transition for existing directors and people with significant control, which closes in mid-November 2026. Companies House estimated that 6 to 7 million individuals would need to verify.

The point most groups miss is that 18 November is a backstop, not the deadline. During the transition, existing directors supply their personal code with the company's next confirmation statement. If that statement falls due in October, October is the deadline. A director who sits on several UK boards is bound by the earliest date across all of them.

Overseas directors are the usual weak spot. Foreign passports, name transliterations and mismatched dates of birth on older records can turn a three minute online check into a weeks long exercise through an authorised agent. Companies House has said it will take proportionate action against those who fail to verify once the transition ends, and it will be an offence to act as a director without being verified.

European Union: E-Invoicing Goes Live Market by Market

There is no single EU e-invoicing date. Each member state is moving on its own timetable and, in several cases, its own technical model.

• Belgium. Mandatory domestic B2B e-invoicing over the Peppol network since 1 January 2026.
• Poland. The national KSeF clearance platform became mandatory for the largest taxpayers on 1 February 2026 and for most other VAT registered businesses on 1 April 2026. The smallest sellers follow on 1 January 2027. An invoice is not legally issued until KSeF has accepted it.
• France. Since 1 September 2026 all businesses in scope must be able to receive e-invoices, and large and mid-sized companies must issue them. Smaller companies follow in 2027.
• Greece. Large businesses began in March 2026 and all remaining businesses from 1 October 2026.
• Germany. Businesses have had to receive structured e-invoices since January 2025. Issuing obligations tighten on 1 January 2027 and again in 2028.

Behind all of this sits the EU's VAT in the Digital Age package, which sets 1 July 2030 for digital reporting on cross-border transactions. The direction is settled. Only the pace varies.

For a group, the practical problem is that Poland uses a government clearance model, Belgium uses Peppol, France uses accredited platforms and Germany prescribes the data standard rather than the route. A finance function still running on PDFs and email cannot receive a valid invoice from a Polish or Belgian supplier, let alone issue one.

Why Groups Keep Getting Caught

We see the same three patterns repeatedly. First, obligations are owned locally by whoever happens to administer each entity, so nobody sees the whole picture. Second, deadlines live in people's heads or in an adviser's inbox rather than in a shared calendar with named owners. Third, the finance system is treated as a local purchase, so every new mandate becomes a separate integration project.

None of this is a legal problem. It is an operating model problem. Groups that handle it well put one executive in charge of the entity estate, keep a live register of every obligation with its owner and due date, and choose invoicing infrastructure once, at group level, rather than country by country.

What to Do Before Year End

• List every director and person with significant control across your UK entities and confirm each has a Companies House personal code
• Pull the next confirmation statement date for every UK company and treat the earliest as the real deadline
• Map every country where you issue or receive B2B invoices against its mandate and start date
• Confirm your ERP or invoicing provider can handle Peppol, KSeF and EN 16931 formats before January 2027
• Name a single owner for the group compliance calendar, with authority across entities

Frequently Asked Questions

When is the Companies House identity verification deadline?

The transition period for existing directors and people with significant control ends in mid-November 2026. In practice, most existing directors must verify by their company's next confirmation statement date, which may fall earlier.

Do overseas directors of UK companies need to verify their identity?

Yes. Every director and person with significant control must verify, wherever they live. Those without UK documents can verify through GOV.UK One Login with accepted foreign documents or through an Authorised Corporate Service Provider.

Which EU countries require B2B e-invoicing in 2026?

Belgium, Poland, France and Greece all brought in or extended B2B mandates during 2026, alongside Italy and Romania, which already had them. Germany requires businesses to receive e-invoices and phases in issuing obligations from 2027.

What happens if a supplier sends a Polish invoice outside KSeF?

For businesses within the mandate, an invoice issued outside KSeF is not a valid invoice under Polish VAT law. Offline mode exists for outages, but the invoice must still be submitted to KSeF shortly afterwards.

Who should own compliance in a multi-country group?

One named executive, usually the CFO or a group company secretary, should own a single register of every entity obligation, with local owners accountable for delivery against it.

Grant & Graham sets up and runs company structures in more than 100 jurisdictions and places senior finance and operations leaders when a group's compliance model needs rebuilding. Explore our company formation and ongoing compliance service, our interim management practice, or book a call with Andrew Collins.

This article is general information, not legal or tax advice. Dates reflect published guidance as of September 2026 and should be confirmed with local advisers.