Sorry, c_h, I don't quite understand. Do you mean that you and your wife entered into voluntary arrangements at the same time - if so I don't understand how your payments would have made it be paid off quicker? Are you paying all of the creditors in full perhaps?
It appears that you already have separate IVAs, they are just mutual and interlocking. Was your property included in the IVA's as an asset - do you have a fourth year revaluation clause?
The bottom line is that if you have no debts, then none of your asset should be taken into consideration, and you no longer have to contribute towards your wife's payments.
Sorry this answer is vague, but can you be more specific about the exact situation you are in. If you have no debts, why are you in an IVA in the first place? You cannot be made to be responsible for your wife's debts - at any time.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
View my IVA blog at:
http://melaniegiles.blogs.iva.co.uk