Hmmm.. well yes and no (yeah i no that helps so i will try and explain)
The OR can not directly take the CTC but will expect you to pay your own expenditure out of the CTC first and then would take any surplus out of an earned income(EA).
Confused. Try this example.
If you had £500 EA and £500 Benefits and Outgoings of £800 then The £500 benefits would pay the first £500 of outgoings. The next £300 would come out of the EA leaving £200 EA surplus. this would be a £100 IPA
Example 2 If you had no EA and £1,000 Benefits and £800 outgoings then you would still have £200 surplus but because the Surplus is directly from the benefits then you would not have an IPA.
This is the same system for all Benefits, tax credits, DLA etc. with the one exception being Child Benefit which is not counted in anyway