Hi cazza and welcome to the forum
It is usual for increased payments when a hire-purchase agreement has expired to be already provided for within the IVA proposals. Did this happen in your case? Even if it did not it is perfectly reasonable for your IP to request all of the money, as he is responsible to your creditors to ensure a maximum return.
The additional monies will neither shorten the term of the IVA or "just profit for the company". (I actually do not understand your latter comment!). If you are incurring additional expenditure, I am suprised that this has not been mentioned to your IP at the annual review stage - but you should most certainly bring this to their attention now as allowance should be made for increases which can be justified.
The spirit of entering into an IVA with your creditors is that you repay as much as you possibly can afford over a set period. I think that it is sad that you are considering bankruptcy as an alternative, when you already have the privilage of IVA proceedings in place, and do beware that a Trustee in bankruptcy is also going to scrutinise your income and expenditure when deciding upon the level of payments you will make under an Income Payments Order for the next three years.
My advice is to take the increase on the chin and look forward to that last payment when you will be finally free from these debts.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk