Hi,
The levy is technically paid by everyone, it's just that everyone gets a £15000 allowance before they pay. If your pay bill is below £3000000 then you will not use the full £15000 and so will not pay it. However if you split the allowance between connected companies, this reduces the allowance for individual companies which may mean that company paid the levy before others.
If the companies were connected at the start of the tax year, they would have paid the levy once they have used the allowance, If they were not connected then they are not treated as connected.
With regards to spliting the annual allowance you should decide the split at the start of the tax year and then leave it as that until the end of the tax year.
Due to the technical nature of your query, if you need any further clarification you will need to contact our Employers team for advice.
Employers: general enquiries
Thank you.