Katy, the confusion arises because nannies often quote their desired income in net, hence asking parents to then pay the taxes for them. This is of course not something I would do. Pay is in gross. I send in the taxes, and they come out of the nanny's paycheque.
However, a nanny who isn't paying taxes is generally willing to work for a smaller amount (because it's tax free). So there is an advantage to both sides. Also, the nanny can continue to collect any low income benefits she might be getting from the government. Ther eis so much room for corruption on both sides in the current system. I don't support any of it, but it does happen.
If we made all income which is used for childcare (childminders, nurseries, nannies) tax free and then collected the tax on the nannies pay, I bet a lot more people would pay the nannies legitimately. Say, I pay the £1500 per month, that £1500 should be deducted from my income before my tax is calculated, but it shouldn't affect my pension contributions (like the stupid voucher scheme does). The only way I'd get that tax deduction is if I paid my nanny legitimately. And it would certainly help working parents. But, that isn't what the government has in mind. They want maximum tax collection, and who cares who they have to impoverish to get it. So, you get parents who have the same loyalty to tax system that the government has to them. And, these attitudes didn't start and don't stop with nanny employers. Lots of business men and women, I'm sure, are quite happy to participate in diddling the tax system. This is nothing new.
When are we going to vote Labour out? Oh yes, that's right, when Gordon calls an election.