Normally you can shave a bit off of the lump sum to reflect time and expense saved ... BUT ... at £92 per month, you are right at the bottom end of viability for an IVA and your creditors are going to get very little anyway, so your wiggle room is not so good. Added to which a variation meeting will add £500 or so to the fees.
It is difficult to guess and I have seen very low offers accepted as well as excellent ones rejected. If it was my IVA I would be thinking more like £4k.
What was your original debt level ?
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014 http://foggy.blogs.iva.co.uk