The immigration authorities are getting much tougher on their policy with regard to financial support, but as an IVA shows a responsible attitude towards debt repayment, based upon an affordable sum after allowing for living costs, I do not see how you would be demonstrating an inability to support yourself. After all the IVA is based upon you being left with enought money to actually support yourself, with the remainder being accepted in debt repayments.
I am in no way an expert on the workings of the Home Office, so it would be best if you checked with them directly or any specialist immigration lawyer.
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