Hi kevinf
If you are already bound to remortgage during the final year, my gut feeling is that creditors are not going to let you away with doing that early.
If you are struggling to make the monthly payments, and with interest rates increasing at the rate they are, you may wish to consider proposing a variation to the IVA on the basis of a lowering of your payments.
Do check the terms of your IVA, as you seem a little uncertain as to what you are actually required to do during the 4th year - and also consider whether switching your mortgage now for a better rate of interest may also be worth looking at.
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