Remote and hybrid working have changed the international tax risk profile of UK businesses. What is often treated internally as a flexible working arrangement can, in reality, create significant Corporation Tax exposure in another country.

Where an employee works remotely from overseas, the issue is not limited to payroll or personal tax. The presence of that employee may create a permanent establishment, trigger foreign Corporation Tax filing obligations, require the attribution of profits to an overseas taxable presence, and expose the business to local employer compliance obligations. In more complex cases, it can also raise transfer pricing, branch profit allocation and double tax treaty questions.

This is the point many businesses miss: a UK company does not need to open an office abroad to create overseas tax risk. In some cases, one employee working habitually from another country can be enough to start the analysis.

Why the Corporation Tax risk matters

Most businesses initially focus on employment tax. That is understandable, but incomplete. The more serious issue is often whether the overseas jurisdiction can argue that the UK company is carrying on business there through a fixed place of business or through a dependent agent.

If that threshold is met, the UK company may have to:

• register for Corporation Tax or its foreign equivalent in that jurisdiction
• file local tax returns
• compute and attribute profits to the overseas permanent establishment
• maintain supporting documentation for the profit attribution methodology
• deal with local accounting, branch reporting or tax payment obligations
• consider whether any double tax relief is available in the UK

That is not an academic concern. It is a live operational tax issue, particularly where the employee is senior, commercially active, client-facing, or involved in negotiating or concluding contracts.

Permanent establishment risk is a Corporation Tax issue first

The term “permanent establishment” is often used loosely, but for a UK employer the practical consequence is straightforward: if a PE is created overseas, the foreign jurisdiction may seek to tax part of the company’s profits.

This means the remote working arrangement can move from being a simple HR matter to being a corporate tax nexus issue.

The core questions usually include:

• Is the employee’s home office or overseas working location sufficiently fixed?
• Is that location effectively at the disposal of the UK company?
• Is the employee carrying on core business activities from that country?
• Does the employee habitually negotiate or conclude contracts?
• Is the arrangement temporary and exceptional, or regular and business-as-usual?

The more regular, strategic and commercially important the overseas activity becomes, the stronger the argument for taxable presence.

Corporation Tax consequences if a PE exists

Once a permanent establishment is found to exist, the next question is not whether tax applies, but how much profit must be attributed to that overseas presence.

That is where the Corporation Tax analysis becomes more technical. The employer may need to consider:

• what functions are being performed overseas
• what assets and risks are connected with those functions
• whether the employee’s activity contributes directly to revenue generation
• whether any profit split or branch attribution methodology is required
• whether transfer pricing principles need to be applied by analogy or directly under local law

For example, a junior employee carrying out purely administrative tasks may present a lower profit attribution risk than a senior commercial employee managing customer relationships or driving sales from the foreign jurisdiction. But in either case, ignoring the issue is dangerous. Once a foreign tax authority asserts a PE, the compliance burden and enquiry risk can escalate quickly.

Remote working abroad can create tax exposure even without a formal office

A common misconception is that Corporation Tax exposure only arises where the business rents office space abroad. That is too narrow. A home office, serviced office, or other regular working location can still become relevant if the facts support a sufficient degree of permanence and business use.

This is why informal overseas remote working arrangements are often the most dangerous. They develop without documentation, without internal controls, and without any structured assessment of PE risk.

The result is that the business may create overseas Corporation Tax exposure by default, rather than by deliberate expansion.

Payroll, withholding and social security still matter

Although the Corporation Tax risk is central, it is not the only issue. The employer must also review whether local payroll withholding, wage tax reporting, employer registration or shadow payroll obligations arise in the country where the employee is physically working.

In parallel, social security must be considered separately. That analysis may depend on whether the employee is working temporarily in one state, regularly in two or more states, or in a country covered by a bilateral agreement. The employer should never assume that the Corporation Tax position, payroll position and social security position will align neatly. They are governed by different legal frameworks.

What UK employers should do before approving overseas remote work

The starting point is not treaty analysis. It is governance.

A UK employer should have a remote working abroad policy that requires prior disclosure and approval, with a tax review before any arrangement begins. That review should cover:

• the country involved
• the employee’s role and level of authority
• the expected duration and pattern of overseas working
• PE and Corporation Tax risk
• payroll and employer registration issues
• social security certificate requirements
• immigration and employment law overlap

In many cases, the correct answer is not an outright refusal. It is a controlled arrangement with clear limits. But that control has to exist at the outset.

Remote working abroad is no longer just an employment flexibility issue. It is a Corporation Tax risk management issue.

For UK companies, the real danger is not simply that an employee is working from another country. It is that the business has allowed overseas activity to develop without assessing whether it has created a taxable presence, a filing obligation, or a profit attribution problem in that jurisdiction.

That is exactly where apparently minor arrangements become expensive.

Vectigalis AC Tax advises UK employers and internationally active businesses on Corporation Tax risk, permanent establishment exposure, overseas payroll, and social security issues arising from remote working abroad. This includes practical PE risk reviews, treaty analysis, branch profit attribution support, and cross-border remote working policy design.

Mail: info@vectigalistax.co.uk