Written by Fanny Di Domenicantonio, Director of Fox & Cubs Nanny & Private Staff Agency.
Hiring a live-in nanny in London is not simply a childcare decision it is also a legal and financial commitment that many families underestimate until they are already in the middle of the process. When you employ a nanny, you become an employer in the eyes of UK law. That means you are responsible for payroll, tax contributions, employment contracts and ongoing legal compliance.
For many families, this can feel complex and unfamiliar at first. However, with the right structure and the right support in place, it becomes entirely straightforward and manageable. At Fox & Cubs, we guide families through every step of this process to ensure full compliance and genuine peace of mind from the very beginning. You can explore our live-in nanny services to understand how we support families throughout.
Are Live-in Nannies employees inder UK law?
Yes and this is the single most important thing for families to understand before hiring. A nanny is legally considered a household employee in the UK, regardless of whether they live in or out of your home.
This means you must issue a written employment contract, pay your nanny through the PAYE system, deduct income tax and National Insurance contributions, and comply with UK employment law in full. This is not optional, and it applies from the very first day of employment. The HMRC guidance on employing household staff is a clear and authoritative resource that every family hiring a nanny should read before beginning the process.
Families who pay nannies informally or in cash without operating PAYE are in breach of UK law and risk significant penalties. This is one of the most common and costly mistakes families make, and it is entirely avoidable with the right setup from the outset.
Setting up payroll for your Nanny
When you begin employing a nanny, you must register as an employer with HMRC and set up a PAYE scheme. This involves calculating the correct income tax and National Insurance contributions for each pay period, issuing payslips, and reporting all payments to HMRC on time.
For most families, this process is best managed through a specialist payroll provider rather than handled independently. The administrative requirements are ongoing and precise, and errors can create complications with HMRC that are time-consuming to resolve.
Using a specialist payroll provider is strongly recommended and is the approach the majority of our families take. Providers such as NannyTax specialise specifically in household employment and manage payroll calculations, payslips, HMRC submissions and pension enrolment on your behalf. This ensures full compliance and removes the administrative burden entirely, allowing you to focus on the placement itself rather than the paperwork behind it.
Gross vs net salary: understanding the true cost
Understanding the difference between gross and net salary is essential for budgeting correctly, and it is an area where families frequently underestimate their total costs.
Net salary is what your nanny receives in their bank account each week. Gross salary is what you pay as an employer before deductions, and it includes income tax and employee National Insurance contributions. On top of the gross salary, you also pay employer National Insurance contributions, which add a further layer of cost.
As a practical illustration, a net salary of £700 per week typically equates to approximately £900 to £1,000 in total weekly cost to the employer once all contributions are accounted for. Over the course of a year, this difference is significant and must be factored into your budget from the start. For a full breakdown of salary ranges and total monthly costs, read our cost of a live-in nanny in London guide.
Your legal obligations as an employer
Beyond payroll and tax, families employing a live-in nanny have a range of legal obligations that must be met throughout the employment relationship.
Employment contract: you must provide a written statement of employment particulars before or on the nanny’s first day of work. This document should clearly set out working hours, salary, duties, holiday entitlement, notice period and any other terms relevant to the role. A well-drafted contract protects both you and your nanny and is the foundation of a professional working relationship.
Holiday entitlement: nannies are legally entitled to 5.6 weeks of paid holiday per year. Whether bank holidays are included within this entitlement or in addition to it depends on what is agreed in the contract, and this should be specified clearly from the outset.
Statutory Sick Pay: if your nanny meets the eligibility criteria, you may be required to pay Statutory Sick Pay during periods of illness. This should be understood and factored into your planning before the placement begins.
Pension contributions: under UK auto-enrolment legislation, eligible employees must be enrolled in a workplace pension scheme. This includes employer contributions, which represent an additional cost on top of salary. Your payroll provider can advise on eligibility and manage the enrolment process on your behalf.
Working hours: while flexibility is a core part of a live-in nanny’s role, working hours must remain reasonable and must be clearly defined in the contract. Excessive or poorly defined hours can create legal risk and are also detrimental to the working relationship over time.
Accommodation requirements
Providing suitable accommodation is a fundamental part of employing a live-in nanny and is something families must plan for carefully before beginning their search. Your nanny must be provided with a private bedroom, adequate privacy and access to appropriate bathroom facilities. The accommodation should be comfortable and suitable for long-term occupancy this is someone who will be living in your home, and the quality of their living space has a direct impact on their wellbeing and longevity in the role.
It is worth noting that providing accommodation does not reduce the salary you are required to pay. A live-in nanny’s net salary reflects the market rate for the role and should not be significantly discounted on the basis of accommodation being provided.
Common mistakes families should avoid
Several mistakes come up repeatedly when families hire a nanny for the first time, and being aware of them in advance is genuinely useful.
Paying in cash without operating PAYE is the most serious and most common error it is illegal and exposes families to significant penalties from HMRC. Issuing unclear or incomplete employment contracts creates ambiguity that tends to become a source of conflict over time. Misunderstanding working hours, particularly in a live-in context, can lead to burnout and early departures. And not accounting for the full employer cost salary, tax, National Insurance, pension and agency fees means families regularly find themselves underprepared financially in the first months of a placement.
A structured approach to the legal and financial setup prevents all of these issues, and it is one of the reasons families consistently tell us that working with an agency from the start was the right decision.
How Fox & Cubs can help
At Fox & Cubs, our support extends well beyond the recruitment process itself. We explain legal responsibilities clearly to every family we work with, recommend trusted payroll partners such as NannyTax, guide contract structuring and ensure that roles are properly and professionally defined before any placement begins.
Our goal is not only to introduce the right nanny it is to ensure the framework around the placement is set up correctly from day one, so that both the family and the nanny have the clarity and confidence they need for a successful, long-term working relationship.
If you are ready to begin the process, get in touch with our team and we will be happy to walk you through everything.
Fox & Cubs insight
“The legal and financial framework around a nanny placement is not complicated once it is properly understood but it does need to be in place from day one. Families who approach this correctly from the start avoid the most common pitfalls and build a far more stable and professional working relationship with their nanny from the outset.” Fanny Di Domenicantonio, Director, Fox & Cubs Nanny & Private Staff Agency.
Frequently asked questions
Do I need to pay tax when I employ a nanny?
Yes. Nannies are household employees under UK law and must be paid through PAYE. You are responsible for deducting income tax and paying both employee and employer National Insurance contributions.
Can I pay my nanny in cash without registering as an employer?
No. Paying a nanny informally without operating PAYE is not compliant with UK law and can result in significant penalties from HMRC. You must register as an employer before your nanny’s first day of work.
Do I need to provide a written employment contract?
Yes, and it must be provided on or before the nanny’s first day. It should clearly set out salary, working hours, duties, holiday entitlement and notice period at a minimum.
Should I use a specialist payroll provider?
Most families choose to work with a provider such as NannyTax, who manage all payroll calculations, HMRC submissions and pension enrolment. This is strongly recommended for ease, accuracy and full legal compliance.
What happens if I do not comply with my legal obligations as a nanny employer?
You risk financial penalties from HMRC, complications with your nanny’s employment rights and potential legal disputes. Getting the setup right from the beginning is far simpler and less costly than resolving problems later.
Conclusion: A structured approach creates peace of mind
Hiring a live-in nanny is one of the most impactful decisions a family can make. When the legal and financial framework is handled correctly from the outset, the placement begins on a strong, professional foundation and families are able to focus on what matters most, which is the quality of the childcare itself.
At Fox & Cubs, we are here to ensure that every aspect of the process is handled with care, clarity and expertise. Speak with our team to discuss your family’s needs and begin your search.
About the author
Fanny Di Domenicantonio is the Director of Fox & Cubs Nanny & Private Staff Agency. With over 20 years of international business and management experience, and as a mother of three herself, Fanny brings a relationship-driven approach and genuine personal understanding to every placement. Her focus is on delivering a premium, personalised service built on trust, expertise and care ensuring every family feels confidently supported and every placement is set up for long-term success. Learn more about the Fox & Cubs team.
About Fox & Cubs
Fox & Cubs Nanny & Private Staff Agency supports families in London and internationally with carefully vetted childcare and household professionals. With a personalised approach and a deep understanding of family life, the agency helps households find reliable, long-term support. Get in touch to discuss your family’s needs.
