Hi Trog
in the past iva companies could charge on a time cost basis, it then became more standard to have set fees (my husband and mine is costing £9000 jointly. Now I think with changes brought in by tix it is about 15% of the total debt.
The main thing with an iva is to choose your company with care, to make sure that your living expenditure is enough for you to live on.
An iva is not meant to be easy but for me and a lot it is a way of paying back as much as we can and means we can have a reasonable standard of living whilst doing so. Yes 75% can be written off, but some actually get very little written off it depends on your income and the return you are giving to creditors, I am paying back 32p in the pound but with the extra overtime being payed in it will be a higher return, so in my case it will probably be about 60% or less written off.
Hope my waffling has helped a little, someone will correct me if they think I am wrong.
Ang
Please visit my blog at
http://aguise.blogs.iva.co.uk/