International data transfers for UK startups: what you need to know after Brexit

Moving personal data across borders is part of day-to-day life for many startups. You might use a US-based CRM, host customer data on servers in Ireland, or share employee details with a payroll provider in India. After Brexit, the rules for these transfers changed for UK organisations. Understanding what’s required helps you stay compliant without slowing down your operations.

what is an international data transfer

Under UK data protection law, a transfer happens when personal data that’s already subject to the UK GDPR is sent to a recipient in a country outside the UK. The location of the recipient matters, not the nationality of the people involved. If your startup processes personal data in the UK and then shares it with a supplier in another country, that’s a restricted transfer. You need a lawful mechanism in place before the data leaves the UK.

why it matters for your startup

The UK GDPR restricts transfers unless certain protections are in place. If you make a transfer without a valid safeguard, you risk enforcement action, fines, and reputational damage. Early-stage companies sometimes assume they’re too small to attract the regulator’s attention, but the Information Commissioner’s Office (ICO) expects all organisations, no matter their size, to get the basics right. Your business partners and enterprise customers will also often ask to see evidence of your transfer arrangements during a vendor due diligence review. Getting the paperwork sorted now saves you from scrambling later.

the post-Brexit landscape

Since leaving the EU, the UK has its own data protection framework. The UK GDPR and the Data Protection Act 2018 govern how you handle personal data. When it comes to international transfers, the UK operates a separate regime from the EU. That means you can’t simply rely on arrangements your business set up before 2021 that reference EU law alone. You’ll need to make sure your transfer documentation works for the UK GDPR.

how to transfer data lawfully

The UK GDPR offers several ways to legitimise a restricted transfer. The most common options for startups are:

• Transfers to a country covered by an adequacy decision. The UK government has decided that certain countries provide an adequate level of protection. Examples include all EU and EEA member states, plus a short list of others. If the destination country has adequacy status, you can transfer data without additional safeguards.
• Standard contractual clauses. UK-specific standard contractual clauses (SCCs), also known as the International Data Transfer Agreement (IDTA), are pre-approved contract terms you can incorporate into your agreement with the data importer. Alternatively, you can use the EU’s standard contractual clauses together with the UK Addendum, which adapts them for UK law. Both are valid under the UK GDPR. Most startups use the IDTA or the Addendum, as it’s a well-trodden path.
• Binding corporate rules. These are internal policies for multinational groups. They’re rarely practical for small startups, so we’ll set them aside here.
• Derogations. The UK GDPR lists specific, limited situations where you can transfer data without the safeguards above, such as when you have the individual’s explicit consent after fully informing them of the risks. Relying on derogations for routine, repetitive transfers isn’t recommended.

step 1: identify your transfers

List every scenario where personal data you control leaves the UK. Think about cloud storage, email marketing platforms, analytics tools, customer support software, and HR systems. For each, note the country where the data goes, the categories of people affected (customers, staff, website visitors), and the type of data. This mapping exercise helps you see which transfers need attention.

step 2: choose a transfer mechanism

For transfers to EEA countries, an adequacy decision covers you. For transfers to the US, you’ll typically use the UK IDTA or the EU SCCs plus the UK Addendum, because the US does not have full adequacy status. Check each destination country against the current UK adequacy list, available on the gov.uk website. Where there’s no adequacy decision, the IDTA or Addendum will be your go‑to tool.

step 3: document your safeguards

Once you’ve chosen the right mechanism, you need to put it in writing. If you’re using the IDTA, you’ll complete the document with the importer and both parties sign. The IDTA is a standalone agreement that sits alongside your main contract. If you’re using the Addendum, you’ll attach it to the EU SCCs already agreed with the importer, fill in the necessary tables, and sign. Many startups embed these documents into their data processing agreements to keep everything in one place. Don’t forget to retain a record of the signed transfer document; the ICO may ask to see it.

Before finalising either the IDTA or the Addendum, you’ll likely need to carry out a transfer risk assessment. This isn’t a form-filling exercise. You’ll consider the laws and practices of the destination country and decide whether the chosen safeguards, together with any supplementary measures like encryption or pseudonymisation, provide a level of protection that’s essentially equivalent to UK standards. The ICO publishes a tool to help with this.

updating existing contracts

If you already have an EU-style data processing agreement that covers transfers, review it. References to “EU standard contractual clauses” alone won’t satisfy the UK requirements. You can either replace those references with the UK IDTA or supplement the EU clauses with the UK Addendum. Check with your legal team or a solicitor to make sure the changes are properly drafted and integrated.

keep it under review

International data transfer rules evolve. The UK may add new countries to its adequacy list, and regulators periodically update guidance. Schedule a point every few months to check that your transfer mechanisms and risk assessments are still valid. If you switch suppliers or expand into a new market, repeat the mapping and documentation steps.

This area can feel technical, but the underlying idea is simple: you need a documented, reasonable basis for each transfer. Starting with a clear map and a standard set of transfer documents makes ongoing compliance manageable. Always consult a solicitor for advice specific to your startup’s situation.