Setting Up a UK Entity: A Step-by-Step Registration Guide

UK company incorporation through Companies House is a relatively fast, low-cost process compared to many countries, typically completed within days once you have the required information: a registered UK address, at least one director, and details of the company's shareholders. Many companies use a formation agent or their accountant to handle this step rather than filing directly, mainly to make sure the registered address and initial filings are set up correctly from the start.

This is the step that's changed the most since Brexit and tends to surprise US founders: UK banks generally require in-person verification or, at minimum, significantly more documentation for a company without an established UK presence than they once did, and the process can take longer than expected. Some digital-first UK business banking providers have streamlined this for non-resident directors, which is worth exploring if a traditional high-street bank's requirements are creating a bottleneck.

A common way to lose weeks is to treat the bank account as the last step. Start the banking application as soon as the company is formed, and gather documents in parallel: the incorporation paperwork, proof of each director's identity and address, a description of what the subsidiary will do, and details of the US parent as shareholder. If a traditional bank asks for in-person verification that is hard to arrange, explore a digital-first provider at the same time rather than waiting for a rejection. A subsidiary that cannot bank cannot invoice customers or pay staff, so the account tends to set the pace for everything that follows.

VAT registration becomes mandatory once your UK taxable turnover crosses the current threshold, and voluntary registration is also possible below that threshold if it makes sense for your specific business (for instance, if you're mostly invoicing other VAT-registered businesses and want to reclaim VAT on your own UK expenses). Confirm the current registration threshold and your specific obligation with a UK accountant rather than relying on a number from an old article, since these figures are periodically updated.

If the UK subsidiary will directly employ people, rather than using an EOR, you'll need to register for PAYE, the UK's income tax and National Insurance withholding system, before the first payroll run. This is a separate registration from the company formation itself and has its own lead time, so don't leave it until the week before your first UK employee's start date.

Brexit primarily affected trade, goods movement, and freedom of movement for people; it didn't fundamentally change the UK company formation process itself, which remains a domestic UK legal matter. What it did change is the banking and compliance environment around a non-UK-resident-owned company, along with some VAT treatment for goods moving between the UK and EU, so the friction founders notice tends to be in banking and cross-border VAT, not in the incorporation process itself.

Company formation itself can happen within days; banking, VAT registration if applicable, and PAYE registration each add their own lead time on top, and can run in parallel rather than strictly sequentially once the company is formed. Plan for several weeks from start to a fully operational UK entity able to bank, invoice, and run payroll, rather than assuming it happens as quickly as the initial Companies House filing suggests.

The full sequence, in the order most companies work through it:

1. Register the company with Companies House, providing a registered UK address, at least one director, and details of the shareholders.
2. Open a UK business bank account, starting early because verification for a company without a UK presence can take longer than expected.
3. Register for VAT if your UK taxable turnover crosses the current threshold, or voluntarily if it makes sense for your business.
4. Register for PAYE before the first payroll run if the subsidiary will employ people directly rather than through an EOR.
5. Engage a UK accountant to handle annual accounts, the confirmation statement, corporation tax returns, and any recurring VAT and PAYE filings.

Formation is the start, not the end, of UK compliance obligations: annual accounts and a confirmation statement need filing with Companies House, corporation tax returns need filing with HMRC, and PAYE and VAT, if registered, have their own recurring filing calendars. Budget for an ongoing UK accountant relationship from the start rather than treating formation as a one-time project, since missed recurring filings can create penalties and, in persistent cases, complications with the company's standing.

Founders sometimes treat the UK subsidiary as a lightweight formality and delay engaging a proper UK accountant until something goes wrong, a missed filing notice, a confused VAT question, a bank asking for documentation nobody prepared. Engage a UK accountant at formation, not after the first problem surfaces; the ongoing cost is modest relative to the cost of untangling a compliance gap once regulators or a bank have already flagged it.