Total cost nanny in London

Lets say you can agree a salary of £18 gross.
8 hours x 5 days per week = 40 hours per week. 40 x 52 = 2080 hours per year.
£37,440 gross per year salary.

Employer pension contribution (3%)= £1123.20 (may be lower than this depending how payroll is done)

Payroll admin & contract=£250

Activity budget: If it was £5 per day then £1200 per year (48 weeks).

If nanny uses their car to transport your children you pay mileage. £0.45 per mile. An average mileage of 60 per week maybe about right, small journeys add up. It can help to track your own mileage in your car for a while to get a reasonable view of what average mileage might be. 60 miles per week, £0.45 per mile, 48 weeks = £1296
If nanny does not use a car, will there be public transport costs, taxis/Uber etc?

Employers National Insurance: £3911

Then food whilst nanny is on duty (so probably lunch and afternoon tea depending what time your children eat in the afternoon/evening).

So rough cost to you as the employer is £44,097 so perhaps budget around £45k.

There are some old threads about costs, which may help. Activity costs are likely higher now, as is gross salary, but it gives you some costs to think about.

www.mumsnet.com/Talk/childcare/3811929-nanny-cost-example-36-hour-week

Ok you're probably looking at a total cost to you of £40k per year, minimum. This is including employers NI, pension contributions etc.
you'll also need public liability insurance although that's not too expensive. Plus you'll have to pay your nanny tax agency unless you decide to do the taxes yourself.

It depends what sort of nanny you want, but £16ph gross is the bare minimum, between £18-22 gross per hour is what you're looking at for more experienced nannies (particularly because you want slightly shorter hours). This is probably dependent on where in London too, I'm in West London.

Other things to factor in: employers NI, pension contributions, the cost of a nanny payroll provider. You're probably best off speaking to nannytax or similar to get an idea of total costs.

In addition, the nanny would normally eat at work, so yes, lunch is included (plus tea/coffee/snacks). You'll also obviously cover any costs incurred while looking after your children (travel, baby groups, activities etc). If you're normally out of the house, you'll also have the cost of gas/electric and wear and tear from having your DC at home all day.

As you only want 8hrs you may end up paying a slightly higher gross hourly rate

Many nannies work 10-12hrs. 8 would be a big pay cut for many over the week

Ballpark £16/20hph plus employers ni /pension

And you have to factor in workplace pension contributions and public liability insurance.

I know 2 nannies in London, both 20+ years experience, both on approx £45-50 gross. They also have cars from their employer. There's insurance etc to factor in. They both bring their own food, and work approx 7.30am-6pm.

You're looking at around £37-38k per year. If you wanted a junior nanny or mothers help where they assist you whilst you're there you could offer less.
Food is usually included yes but just the basics for breakfast and lunch that you would normally buy with your weekly shop anyway.
Although, I had a mum once begrudge me a bowl of porridge which I couldn't believe! Some families are tight. I wouldn't suggest you be that parent. You won't get a good nanny who will want to stay for long!

I'm a nanny in London. You're looking at around £16-18ph gross for an experienced, qualified nanny.

Can't advise on London costs (we're employing a nanny in the southeast) but I'd strongly advise you not to agree to a net contract under any circumstances. You'd risk paying much more than expected if her tax status changes. Nannytax has a good article on this I think. They also have pay data and a total cost calculator on their site, both really useful.