Most global mobility managers already know the problem. An overseas employee flies in for a week of meetings. Nobody thinks it’s a tax event. Then, twelve months later, HMRC disagrees.
Under UK law, any individual performing employment duties on UK soil owes UK tax on those earnings. It does not matter where their salary is paid or where they live. The obligation sits with the host company. By default, that means operating PAYE from day one, even for a two-day visit.
That is where the STBV agreement comes in.
What is an STBV agreement, and why does it matter?
A short-term business visitor arrangement is a formal concession from HMRC that lets qualifying employers defer or disregard PAYE obligations for overseas staff visiting the UK.
There are two main types: Appendix 4 and Appendix 8. Each serves a different population.
Without one, every visit triggers:
- Withholding obligations from day one
- Monthly RTI submissions
- NIC assessments for each individual
The administrative load is often completely out of proportion to the actual tax at stake. The STBV agreement exists precisely to remove that friction, provided you can show HMRC you have the controls to back it up.
Appendix 4: For treaty-country residents
This is the one most teams rely on. If your visitor is a tax resident in a country that has a double tax treaty with the UK, and their stay falls within the treaty’s 183-day limit, you can include them in an annual Appendix 4 report rather than running a monthly payroll. The report is due by 31 May after the end of the tax year.
The 183-day test is straightforward in principle. In practice, the “economic employer” question is where things get complicated. HMRC looks past the legal employment contract and asks:
- Who actually controls this person’s work?
- Who bears the cost and risk?
- Which entity truly benefits from the duties performed?
If the answer points to the UK entity, treaty relief may not apply regardless of how many days the person has spent here.
There is one practical relief within this, though. If the visitor is in the UK for 60 days or fewer, HMRC will generally accept treaty protection even where costs have been recharged to the UK business. This is an administrative concession, not a statutory right. It requires careful tracking of linked trips across the year.
Appendix 4 Reporting
Reporting under Appendix 4 is tiered by days spent in the UK:
- 1 to 30 days: Minimal reporting requirements.
- 31 to 59 days: PAYE can be disregarded, providing there is no formal UK contract, and the visit is not part of a longer pattern.
- 60 to 90 days: Full disclosure required by 31 May, including name, address, and nature of duties.
- 91 to 150 days: As above, plus a formal Statement of Residence from the overseas tax authority.
- 151 to 183 days: Named individual application to HMRC required, along with a personal statement from the employee, before the threshold is reached.
Appendix 8: For everyone else
Some visitors cannot use Appendix 4. This includes:
- Nationals from countries without a UK double tax treaty (Brazil being the most common example).
- Employees of an overseas branch of the UK company itself.
For these individuals, UK tax applies from their first working day. But that does not mean you need a full monthly payroll. Appendix 8 allows you to operate an annual PAYE scheme instead. You calculate the total UK liability at the end of the tax year and settle it in a single payment by 31 May.
A few important constraints apply:
- The scheme is capped at 60 workdays per visitor, per tax year.
- Anyone who exceeds 60 days must move onto a standard monthly payroll immediately.
- Appendix 8 cannot be used where a UK NIC liability exists.
One thing to flag: Appendix 8 involves real tax payments. Unlike Appendix 4, which is an informational filing, Appendix 8 means money leaving the business. If your company is covering the tax itself, the liability is grossed up. That can produce some uncomfortable surprises if visitor numbers are not well controlled.
What changed in 2026
Two things shifted the compliance environment significantly this year.
ETA enforcement. Since February 2026, all visa-exempt nationals need an Electronic Travel Authorisation to enter the UK. Every arrival and departure is now recorded digitally, and HMRC has access to that data. This affects most of the countries your travellers are likely coming from:
- United States.
- EU member states.
- Canada.
- Australia.
HMRC can now cross-reference your Appendix 4 or Appendix 8 filing against actual border records. A discrepancy of even a handful of days can trigger a Business Risk Review. Spreadsheet tracking, maintained by employees after the fact, is no longer a credible approach.
ERS reporting relaxation. From February 2026, HMRC no longer requires companies to include STBV-covered visitors in their annual Employment Related Securities return, provided no UK tax or NIC is due. This removes a significant year-end headache for anyone running global share plans.
The ‘director problem’
This is where many STBV programmes quietly unravel. Non-resident directors of UK companies are office holders under UK law, and they are generally excluded from both Appendix 4 and Appendix 8. The risks are specific:
- HMRC expects a proportion of a non-resident director’s global salary to be taxed in the UK from their first board meeting
- Travel and accommodation paid by the company may be treated as a benefit in kind, reportable via P11D
- Directors from countries without bilateral social security agreements, such as Australia or South Africa, may face NIC liabilities from their first working day in the UK
There is no STBV safety net for this group. They need their own process.
A note on Brazil
Brazilian visitors have been a pain point for years. There is no comprehensive UK-Brazil double tax treaty currently in force, so Appendix 4 is unavailable, and Appendix 8 or full PAYE applies. A treaty was signed in 2022, but still requires ratification through Brazil’s congress. Until that happens, nothing changes for this population.
What good compliance looks like now
HMRC’s own guidance says employers must have a robust internal system to hold an STBV agreement. In 2026, robust means digitally verified. The practical checklist:
- Track travel using actual data, not employee self-reporting. Integrate with your travel management company or booking platform so every trip is captured automatically.
- Set threshold alerts at 30, 60 and 150 days so you are not discovering breaches after the fact.
- Assess the social security position of every visitor separately, before travel begins. The STBV agreement does not automatically cover NIC.
- Keep directors out of the standard STBV framework entirely. They require a separate compliance track.
- Document everything. In an audit, digitally verified records are the only ones that hold up against border data HMRC can now access directly.
The STBV agreement is one of the most useful tools in UK global mobility. But it only holds up if the data behind it does. That, increasingly, is the job.
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