Joanne,
I’m assuming from your post what non-dep deduction you should make for the run on period and that your claimant is aged under 60.
Looking at Regulation 74, subsections (1) and (2) give the deductions which should be made if the non-dep is in remunerative work. Subsection (8) states that a non-dep aged under 25 and on IS/JSA(IB) has no deduction made in respect of them.
The way I see it, if a non-dep is aged over 25 and in remunerative work, then the appropriate deduction depending on their actual income should be made. If aged under 25, because of sub-section (8) there should be no deduction due to the fact that the non-dep is still receiving IS/JSA(IB).
Never had to think about this before, so I’m willing to be contradicted. Does seem a bit unfair.