A repayment holiday from your mortgage is a matter for your lender. Depending on the reasons a payment break from your IVA provider might be agreeable --- in either case the missed payments would be tacked on at the end of the terms.
One or other might even be offered as part of a government package as things develop. However I would say that, in any given situation, we are gven a finite number of lifelines -- do not use them up hastily.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014 http://foggy.blogs.iva.co.uk
I was also wondering this, just got told I'm taking a 20% cut and its gonna be pretty tight, was hoping this "holiday" would create some breathing space. Did you ring your IVA company and ask about taking a mortgage holiday?