Introduction: Nanny Tax Is a British Problem With an American Sting
Nanny tax is the informal name for the payroll obligations you take on when you employ someone in your own home. For an American family in London, those obligations fall mainly under British law. However, the phrase means something different in each country, and most families we meet have prepared for the wrong one.
In America, nanny tax means Schedule H, Social Security and Medicare. In Britain, it means PAYE, National Insurance, a workplace pension and employment law. Furthermore, the two systems meet in places nobody expects, such as a summer in the Hamptons or a US nanny brought over with the family. At TaxYork, we prepare US and UK returns for investment bankers, fund principals and company owners, and household payroll is one of the most common gaps we find.
Why Nanny Tax Confuses American Families in London
The confusion starts with habit. An American parent knows that a US household employer files Schedule H with Form 1040. Therefore, many assume that the same form covers a nanny in Kensington. It does not. Meanwhile, the British duties that do apply arrive with no reminder from anybody.
Additionally, London agencies often quote pay as a weekly net figure. That custom hides the true cost and shifts every tax risk onto you. As a result, a family can run a household for years without registering as an employer, and the bill grows quietly.
Who This Guide Is For
We wrote this guide for US citizens and green card holders in Britain who employ a nanny, housekeeper, driver or private chef. It also suits dual national families and those arriving on assignment. Above all, it explains what nanny tax costs in both countries, and how to repair past years.
What Nanny Tax Means in Britain
In Britain, nanny tax is ordinary employer payroll applied to a private household. You become an employer the moment you hire someone whose hours, duties and place of work you control. Consequently, HMRC expects from you exactly what it expects from a company, and nanny tax follows from that single fact.
You Are an Employer, Not a Client
A nanny is almost never self-employed. HMRC looks at control, personal service and the obligation to provide work. A nanny who works set hours in your home, for you alone, is your employee. Therefore, an invoice from the nanny does not move the liability.
Importantly, the consequences sit with you. If HMRC reclassifies the arrangement, you owe the tax and National Insurance that should have been deducted. In our experience, self-employed status survives only for genuine short-term maternity nurses and similar specialists.
PAYE Registration and Real Time Reporting
You must register as an employer with HMRC before the first payday. Thereafter, you report every payment through payroll under real time information, on or before the day you pay. You also issue payslips, a P60 each year and a P45 on leaving.
Furthermore, HMRC charges penalties for late submissions and late payments. A weekly payroll means 52 filing dates a year. Consequently, most families outsource the run, yet the legal responsibility stays with the named employer.
Employment Law Comes With the Payroll
Tax is only part of the duty. You must give a written statement of terms, and Acas guidance on employment contracts sets out what it should contain. Additionally, a full-time employee earns 5.6 weeks of paid holiday a year, plus statutory sick, maternity and redundancy rights.
You must also pay at least the National Living Wage, which is £12.71 an hour for those aged 21 and over from April 2026. Notably, the old exemption for live-in workers treated as family ended in April 2024. Finally, employers' liability insurance is compulsory for almost every household employer.
The Real Cost of Nanny Tax in 2026/27
The real cost of nanny tax is the gap between what your nanny receives and what you pay. For a well-paid London nanny, that gap exceeds £16,000 a year. Therefore, you should budget on the employer's total, never on the take-home figure.
Employer National Insurance at 15 Per Cent
Employer National Insurance is the largest extra. Under the 2026 to 2027 employer rates and thresholds, you pay 15 per cent on earnings above £5,000 a year. The threshold fell from £9,100 in April 2025, and the rate rose from 13.8 per cent.
For example, a salary of £45,000 produces employer National Insurance of £6,000. A salary of £60,000 for a senior nanny or house manager produces £8,250. Moreover, the charge has no upper limit, so it rises with every pay increase.
Why the Employment Allowance Does Not Apply
Businesses can set the first £10,500 of employer National Insurance against the Employment Allowance. However, households cannot. The Employment Allowance eligibility rules exclude anyone employed for personal, household or domestic work, and they name nannies specifically.
The only exception covers carers and support workers. Consequently, a family employing a nanny and a housekeeper pays the full 15 per cent on both, while a small company with two staff may pay nothing. Many payroll illustrations aimed at businesses therefore understate the household nanny tax cost.
The Workplace Pension Duty
You must also run a pension. An employee aged at least 22 who earns over £10,000 a year must be enrolled automatically. Under the workplace pension contribution rules, you pay at least 3 per cent on qualifying earnings between £6,240 and £50,270.
On a £45,000 salary, that minimum is £1,162.80. Additionally, you must choose a scheme, issue enrolment letters and file a declaration of compliance. The Pensions Regulator enforces these duties separately from HMRC, with its own fines.
Gross Pay, Net Pay and the Agency Trap
A net pay agreement is the most expensive mistake in this field. If you promise £700 a week after tax, you agree to cover whatever tax your nanny's circumstances produce. Therefore, a second job, a student loan or an underpayment in her tax code becomes your cost.
Instead, always contract on a gross annual salary. Moreover, a gross contract keeps the nanny's pension and benefit entitlements clear. We recommend converting any existing net arrangement at the next pay review, with a written variation, so that your nanny tax bill becomes predictable.
Housekeepers, Drivers, Au Pairs and Shared Nannies
Despite its name, nanny tax covers every person you employ in a private household. The same rules reach a housekeeper, a chauffeur, a private chef, a gardener and a personal assistant who works from your home. Consequently, a large household can carry several payroll records and a six-figure employer cost.
Other Household Staff
Each member of staff needs an individual status review. A housekeeper who works fixed days under your direction is an employee. In contrast, a gardening firm that sends different people and serves many clients is a contractor. Therefore, the label matters less than the working pattern.
Additionally, couples employed together, such as a housekeeper and a driver, are two separate employees. Each has a personal allowance, a National Insurance record and pension rights. Moreover, free accommodation for live-in staff needs care, because the minimum wage rules limit how much of it counts as pay.
Au Pairs
An au pair sits outside nanny tax only in narrow circumstances. The government guidance on au pairs describes a young person who lives as part of the family, helps for around 30 hours a week and receives pocket money. Such a person is not usually an employee.
However, a full-time carer described as an au pair is a nanny in law. Furthermore, American families should note that an au pair generally needs an existing right to live in Britain. No dedicated au pair visa is available.
Nanny Shares and Part-Time Staff
A nanny share creates two employers, not one. Each family registers separately, runs its own payroll and applies its own £5,000 National Insurance threshold. As a result, a share can reduce the combined nanny tax cost, although both families must coordinate the nanny's tax code.
Similarly, part-time staff below the pension earnings trigger can still ask to join a scheme. You must also keep payroll records for anyone paid above the lower reporting limits, even where no tax is due.
Does the IRS Want Schedule H From a Family in London?
The American side of nanny tax rarely applies to work done in Britain. Schedule H collects Social Security, Medicare and federal unemployment tax, and those taxes depend on where the work happens and who the employer is. Nevertheless, three exceptions to this nanny tax rule catch London families.
The Statutory Definition of Employment
Social Security tax applies only to "employment" as the Code defines it. Under section 3121 of the Internal Revenue Code, that means service performed within the United States. Alternatively, it means service outside the United States by a US citizen or resident for an American employer.
A British nanny working in London meets neither limb. She is not a US citizen, and she works outside the country. Consequently, no Social Security or Medicare tax arises, and IRS Publication 926 has nothing for you to report on her London wages.
Why a London Family Is Usually Not an American Employer
The second limb needs an American employer. For an individual, the statute requires a resident of the United States, and citizenship alone is not enough. Therefore, a US citizen family that lives in London is generally outside the definition, even when the nanny is also American.
However, the position is less clear for a family on a short assignment that keeps a US home. Similarly, a US corporation is always an American employer. As a result, paying a US citizen nanny through your American company or family office brings her London wages inside the US system.
The 2026 Schedule H Thresholds
Where US employment does exist, the thresholds are low. For 2026, Schedule H is required once you pay one household employee cash wages of $3,000 or more. The combined Social Security and Medicare rate is 15.3 per cent, split between you and the employee.
Additionally, federal unemployment tax applies once you pay $1,000 in any calendar quarter. That tax is 6 per cent on the first $7,000 of wages, before any credit for state contributions. The unemployment tax definition in section 3306 follows the same place-of-work logic.
When the American Nanny Tax Does Apply
The American nanny tax returns the moment your household staff work on US soil. It also returns when the employer is American in the statutory sense. Importantly, neither situation is rare for wealthy families who keep a home in both countries.
The Summer Trip to the United States
Work performed in the United States is employment, whatever the nationality of the nanny or the residence of the family. Therefore, five weeks at a house on Long Island can create a Schedule H filing. At a £45,000 salary, five weeks of pay is about £4,327, or roughly $5,800, which clears the $3,000 threshold.
Moreover, the nanny may need the correct visa to work for you during the visit, and some states add their own unemployment and insurance rules. We recommend checking both, and the American nanny tax position, before you book flights.
The Certificate of Coverage
The US-UK social security agreement solves most of this problem. Under the totalization agreements, an employee sent temporarily to the other country stays in the home system. Consequently, a nanny who remains in UK National Insurance is exempt from US Social Security and Medicare during the trip.
However, the exemption needs evidence. You should obtain a certificate of coverage from HMRC before travel, as the guidance on National Insurance when working abroad describes. Notably, the agreement does not cover federal unemployment tax, so that smaller charge can still arise.
The US Citizen Nanny Working in Britain
Some families bring an American nanny with them. In Britain, she is an ordinary employee, so PAYE, National Insurance and the pension duty all apply. Additionally, she files her own Form 1040 and usually claims the foreign earned income exclusion or a credit for UK tax.
Importantly, she receives no Form W-2 from a London household. She reports her wages as foreign employer compensation instead. Furthermore, her right to work matters. The Overseas Domestic Worker visa lasts six months and cannot be extended, so it does not support a permanent role.
Paying Staff Through a US Company
Routing household pay through a US company looks tidy and usually backfires. The corporation is an American employer, so a US citizen employee's London wages become US employment. Therefore, Social Security tax applies unless a certificate under the agreement assigns her to the British system.
Moreover, a company that pays for your private household staff provides you with a taxable benefit. In contrast, direct employment by the family keeps the position simple. Our guide to P11D benefits in kind for Americans in Britain explains the benefit charge.
Can You Deduct or Credit the Cost on Your US Return?
Neither country gives wealthy parents much relief for nanny tax. The wages are a personal expense, and the available credits shrink or vanish at high incomes. Nevertheless, the forms still need care.
No Deduction and No Foreign Tax Credit
Household wages are personal living expenses, so section 262 of the Code denies any deduction. Similarly, the employer National Insurance you pay is not an income tax on you. Therefore, it earns no foreign tax credit on your Form 1040.
Consequently, the 15 per cent nanny tax charge is a pure cost in both systems. In contrast, an employer contribution to your own UK pension can carry treaty advantages. Household payroll has no equivalent.
The Child and Dependent Care Credit and the LAFCP Entry
The child and dependent care credit is technically available. From 2026, the top rate is 50 per cent, yet high earners receive the 20 per cent floor on up to $6,000 of costs for two or more children. That produces a maximum of $1,200, claimed on Form 2441.
A British nanny has no US taxpayer number. Fortunately, IRS Publication 503 allows families living abroad to enter "LAFCP" in place of the number. However, income you exclude under the foreign earned income exclusion does not count as earned income for the credit. Additionally, the credit cannot reduce the net investment income tax, so families whose UK tax already covers their US income tax gain nothing.
Why UK Tax-Free Childcare Rarely Helps
Britain offers Tax-Free Childcare, worth up to £2,000 a year per child. However, the scheme closes if either parent has adjusted net income above £100,000. The nanny must also be registered with the regulator.
Therefore, the families who read this guide almost never qualify. Similarly, American dependent care accounts rise to $7,500 from 2026, yet only a US employer plan can offer one. Our guide to VAT on UK private school fees covers the next stage of family costs.
Putting Right Years of Unreported Nanny Tax
Unreported nanny tax is more common in wealthy households than in modest ones, because long-serving staff were often hired informally. Fortunately, HMRC treats a voluntary correction far better than a discovered one. Nevertheless, the arithmetic is unforgiving.
What HMRC Can Assess
HMRC can normally go back four years, six years where the failure was careless, and twenty years where it was deliberate. Furthermore, the employer carries the primary liability. Under regulation 72 of the PAYE Regulations, HMRC shifts the tax to the employee only in limited cases.
Additionally, a cash wage paid without deductions is treated as a net figure. Therefore, HMRC grosses it up, and you owe the tax, the employee's National Insurance and the employer's National Insurance on the higher amount.
Penalties and Interest
Penalties depend on behaviour and disclosure. The HMRC penalties overview explains that an unprompted disclosure of a careless error can reduce the penalty sharply, sometimes to nil. In contrast, a deliberate failure discovered by HMRC attracts far heavier charges.
Moreover, late-paid tax carries interest from the original due dates. The Pensions Regulator can also backdate pension contributions. Consequently, delay increases every element of the nanny tax bill.
How This Connects to Your Own Returns
A nanny tax failure rarely stands alone. In our experience, families with informal staff arrangements often have missed UK tax returns or missed US tax returns as well. An HMRC employer review can therefore open questions about your own Self Assessment.
Similarly, any US-side exposure from American trips belongs on Schedule H for the correct years. We prepare both sides together through our US tax return preparation for expats, so the corrections agree with each other.
Case Study: The Harper Family in Notting Hill
This illustrative case shows how nanny tax works across both countries. James and Laura Harper are US citizens who have lived in London for nine years. James is a managing director at a bank, and Laura is a partner in a consultancy. They have two children and a British nanny.
The Annual Cost Done Properly
The Harpers agree a gross salary of £45,000. Employer National Insurance is £6,000, being 15 per cent of £40,000. The minimum pension contribution is £1,162.80. Therefore, the total cost is £52,162.80, before insurance and payroll fees.
Their nanny pays income tax of £6,486 and National Insurance of £2,594.40. Consequently, she takes home about £35,920 before her own pension contribution. The gap between her take-home pay and the family's cost is roughly £16,240.
Three Earlier Years Paid in Cash
Before this, the Harpers paid £700 a week in cash for three years, with no payroll. HMRC treats £36,400 a year as net pay. Grossed up at current rates, that equals a salary of about £45,667. As a result, each year carries income tax of £6,619, employee National Insurance of £2,648 and employer National Insurance of £6,100.
The annual shortfall is therefore about £15,367, or roughly £46,000 across three years at current rates, before interest and penalties. The Harpers make an unprompted disclosure, which keeps the penalty at the lowest level available.
The Summer on Long Island
Each July, the family spends five weeks at a house on Long Island, and the nanny travels with them. Her pay for the period is about $5,800 at an assumed rate of $1.34. Without a certificate of coverage, the Harpers would owe Social Security and Medicare of about $887 through Schedule H.
With the certificate from HMRC, that charge falls away. However, federal unemployment tax of up to $348 can remain, because the agreement does not cover it. Finally, the Harpers claim no childcare credit, since UK tax already eliminates their regular US income tax.
How TaxYork Can Help
TaxYork provides comprehensive tax preparation and compliance for American families in Britain. For household employers, we review the employment status of each member of staff and calculate the full nanny tax cost on a gross basis. Furthermore, we prepare disclosures for earlier years and reconcile them with your own returns.
Additionally, we handle the American side. That covers Schedule H where US work exists, Form 2441 with the correct provider entry, and the certificate of coverage process. Families on assignment can also read our guide to tax equalisation and hypothetical tax, and our treaty and social security work covers the agreement in detail.
Conclusion
Nanny tax for an American family in London is first a British obligation. You owe PAYE, 15 per cent employer National Insurance without the Employment Allowance, and a pension contribution. Moreover, a net pay promise or a cash arrangement moves every risk onto you.
In contrast, the American charge usually stays dormant. Schedule H does not reach a British nanny working in Britain. However, it wakes when staff work in the United States or when a US company becomes the employer. Ultimately, a gross contract, a registered payroll and a certificate of coverage before each American trip resolve almost every problem.
Contact Us
If you employ household staff in Britain and want your nanny tax position checked in both countries, speak to us. Please book a consultation with our team, email hello@taxyork.com or call 020 3488 8606. We will review your payroll, your past years and your US filings together.
Disclaimer
This article is for general information only and does not constitute tax, legal, immigration or employment advice. Tax and payroll rules in the United States and the United Kingdom change frequently, and the correct treatment of any household employee depends on your individual facts, residence status and the terms of engagement. The case study is illustrative, uses current rates for earlier years, and assumes a rounded exchange rate. You should obtain professional advice before acting. TaxYork accepts no liability for decisions made in reliance on this article.