You will need to put all details down on your I&E for the review but I would speak to your IP now so they know of the change of circumstances.
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
I agree you should tell your IP asap. If this affects your ability to pay the IVA you may need a variation meeting of creditors. Best to do it sooner rather than later so the IVA completion isn't compromised.