Part-time employment and nannyshares
If you work for two or more families it is especially important that you agree a gross wage rather than a net. One family should be designated as the main employer using all of your tax code and personal tax-free allowance. This means that the main employer will be paying proportionally more to you and less in tax and NICs, whereas the second employer will be paying proportionally less to you and more in tax and NICs, however overall the amounts will balance out and you are being paid and taxed correctly.
It is strongly recommended that both families register as employers as this will save everyone involved money. Your employers will save approximately £20 each per week (£1,040 per year) in National Insurance contributions. As the employee, you will also benefit by having to pay less National Insurance, and, should you become ill you would receive twice the normal amount in Statutory Sick Pay*. This is also true if you should become pregnant*.
It is a good idea to work out your holiday in advance with both families. Most nannies and their employers agree to compromise on this issue, so that nanny gets to choose two weeks and then agrees to take the remaining two weeks at a time that is suitable for the family. This could get complicated in a share situation, and if not agreed in advance could result in you working for only one family (if the other one is on holiday), and consequently receiving only half your normal wages.
* Assuming you earn an amount equal to or greater than the Lower Earnings Limit from each employer. Please see our Rates page for current LEL rate.