Personally, I am going to claim in every possible area that applies to me - more than the guideline where applicable (I had to spend £700 on car repairs last Year, and £400 on a boiler repair). Sure, I've got to be honest, but equally, I do not keep track of some of the smaller out-of-pocket expenses eg: newspapers/magazines etc, nor do I ask my 4-Year-old for a receipt for his pocket money.
I am approaching my first annual review, and thus far my IVA company has been pretty unhelpful: I got a 4-line letter requiring that I complete a new I&E form, and send in the last 6-months payslips (which I don't have, being self-employed - granted I'll send them my accounts instead), and bank statements.
My new case officer's phone goes to voicemail EVERY time, and she never replies to emails (whenever I have sent in updated creditor statements etc).
This is a far cry from the assistance provided to me when signing up: The staff were very attentive. They bent over backwards to ensure I was claiming for everything in the CCCS guide and some, to minimise my IVA payment. (They even attempted to 'invent' fuel/servicing for my Wife's car - she does not drive. I put them right of course, and this category was changed to 'taxi fares/public transport').
Amazing how some of these firms are so helpful when they see a few grand coming their way when you are contemplating an IVA, and then seemingly couldn't give a fig, once you are trapped!!!
Point is, that if a customer in these circumstances is not on-the-ball, they could end up under-claiming expenditure, with their IVA payments going up significantly, if not properly scrutinised by their case officer. I wonder if this is the cause of so many problems? I bet many firms are willing to demand the higher payment without checking that closely.
If I 'claim' all my allowances, I technically spend more than I took home (on paper, thanks to a decent accountant), based on the latest available accounts. Well, if my case officer cannot be bothered to engage in a quick explanatory conversation (ie: to say that I can actually afford my IVA), I am going to do just that. Maybe it will prompt my IVA firm to getting of their backside, getting their case officer on the case!!!
(Sorry, rant over - I do wish with hindsight that I had signed up with a different firm though).
My opinions are just that: Based on my experience and being a self-employed IVA customer.