Is there a way to find out in advance how much tax credits will you receive to pay for childcare?

[Falconi]

Let me try and explain the situation.
I am a CM and I have a good friend who is desperately in need of childcare for one day a week from 8 until 6.
She would be happy sending her DC to my neighbour who is a sahm and has a child the same age and is also the child's god mother but she needs some one who is registered for tax credit purposes.
Anyway, I can offer a place but not until 6pm.
So my idea is to look after friend's dc until 3 or 4pm and than drop off at the neighbour's place. This way the neighbour won't being breech the rules either as it will be 2 -3 hours unregistered childcare a week.
So I am thinking thy could use all the tax credit money to pay me and the excess they would have to pay me they ca give to the neighbour.
Would this work?
I have just had this idea, and didn't speak to none of hem yet.

The Turn 2 us benefits calculator will calculate all sorts of things but it needs a lot of information.

Not sure how the money side of your idea would work. If they claimed to be paying for approved childcare from 8am-6pm but you only provided 8am-4pm, then your invoices would not match with what is being claimed.

Hi. Just realised the OP is not clear and full of mistakes, I apologise.
My contract would be from 8-4 and this is what they would have to claim. Payment to the neighbour is between them I will not get involved.
I guess this would be a good deal for them if they are not entitled to receive full childcare costs (10h/week).
If they pay me only 8h a week, they can pay the other 2h week to the neighbour who is not registered and will have to charge cheaper than me.

There's nothing that says the neighbor would have to be cheaper. Tbh I would just say that you are happy for their neighbor collect/drop the children off if they choose and then stay out of financing it.

The mum was considering the neighbour when she realised she wouldn't find a CM close to her and before asking me (she had asked before but I didn't have places). It was the mum who said she would just give 'some' money to the neighbour, as she is also the child's godmother and the parents apparently can't give much more as they will rely on tax credits to pay for registered childcare.