Well more than half I think they leave you with about £13 of it but that's going off the top of my head.
For ages I've been going on benefit threads trying to explain to those who use the online calc and then declare that they would be rich or there neighbours sisters hairdresser dog walkers girlfriend is loaded because she's raking it in on benefits.
And they never ever get it. Some benefits cancel out others some are passport benefits to others and even those passported to may be deducted by some.
The two fav's appear to be HB, WTC,CB and CA
CB is deducted by IS as a guideline with IS everything is taken into account as money already coming in apart from maintainance as the IS sum for your age is all you will be allowed to keep.
CA is taken into account and either fully or partially deducted by every single other benefit inc WTC and CTC
Any higher sums of benefits you receive for a disabled child are not protected from means testing apart from DLA so they are fair game in income assessments inc by HB
Maintainance and sever disablement element of WTC and CTC are even taken into account by legal funding.
I have a friend whose a single parent to two kids one is disabled her maintainance never gets paid to her ever but she cannot afford to go back to court to get a none mol ( domestic violence related)and tenancy transfer as her child's disabilitiy premiums and the not received maintainance are included in her legal aid assessment yet they don't deduct any amounts that she has to pay out for essential disability services like carers ect. She only earns about £99 a week.