Hi James
The "techncial" answer to your query is that the money held in the joint bank account is held to the order of both account holders, but the non-bankrupt party could argue their position with the Trustee on the basis of proof of deposits and payments out.
With regard to the calculation of monthly payments under an IPO or IPA, please note that this is entirely at the Official Reciever's discretion, and the able that Skippy is referring to is a guideline but not set in tablets of stone.
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