The direct route
Employing the person yourself, with no UK company
A Swiss company with no UK place of business has two routes, and on both the company stays the employer. Someone working in the UK for an employer in the EU, Gibraltar, Switzerland, Norway, Iceland or Liechtenstein usually pays UK National Insurance, unless they have a certificate of coverage from that country. If your employee already has one, there's no National Insurance scheme to register and no fee for one.
Switzerland has its own agreement with the UK
Switzerland isn't in the EU, so the UK and EU Trade and Cooperation Agreement doesn't decide this. The UK and Switzerland have their own Convention on Social Security Coordination, and HMRC's employer guide for 2026 to 2027 lists Switzerland among the agreements that include employer obligations. The rule for the employer is in its Article 18(1).
Having no UK office or place of business doesn't on its own remove UK employer's National Insurance, because where a social security agreement applies, it treats the employer as if it were based in the UK. Under the UK and Switzerland Convention on Social Security Coordination, an employer whose registered office or place of business is outside the UK has to meet its obligations under UK law, including paying the contributions, just as if it had its registered office or place of business in the UK.
The NI-only route
So where UK National Insurance is due, it is due on both sides, the employee's and the employer's. HMRC's manual says an NI-only scheme is the one used where the only liability is for both of those, and that the employer sets it up and pays the National Insurance to HMRC. A DPNI or DCNI is for an employee whose employer has no liability to pay, so neither fits. The employer sets the NI-only scheme up in its own name, or has a UK agent set it up for it. We will ask HMRC for the scheme that fits your facts, and they may suggest a different one once they have the full facts.
Employer's National Insurance is the company's cost
For most employees, UK employer's National Insurance is 15% of pay above £5,000 a year. An employer based in the EU, Gibraltar, the Isle of Man, Switzerland, Norway, Iceland or Liechtenstein can owe it too, where the employee works in the UK and UK National Insurance is due. It is the employer's cost, not the employee's.
Your employee's income tax on an NI-only scheme
This scheme doesn't take your employee's income tax off their pay. They pay their income tax through their own Self Assessment or, if they'd rather, through a tax-only scheme in their name.
If you provide benefits or expenses
If an employer also provides expenses and benefits, HMRC set its record up as a "P" scheme instead of an NI-only one, because they expect a form P11D(b) and a Class 1A National Insurance charge. It's a different kind of HMRC record, not a different price, and we charge the same either way.
Or run UK PAYE in the company's own name
The other route is for the company to run UK PAYE in its own name. A UK PAYE scheme in the company's own name starts at £225 a month plus £8 per payslip, and setting it up costs £350.