You may well find that your IVA is extended but you need to speak to your IP about this as they know all the details of your account.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk
This should have been explained fully when the payments were reduced. If your IVA has a minimum dividend clause then you would either have to make up the shortfall over the course of the IVA or have extra months added to the end to allow you to catch up.
If on the other hand creditors agreed to the reduction(involving another meeting),then you may not have to make up the missing amounts.
Talk to your IP firm to be sure.
Paul
Discharged today the 8th feb 2012. View is much brighter now.
Continuing to rebuild our credit worthiness.