Normally at review time they ask for any outstanding wage slips from the year, your P60 and proof (copies of utilities statements, etc..)of any expenditure increases.
I`m paid weekly and I send in scans of my wage slips to my case manager every month which they then add to my file.
"When the seagulls follow the trawler, it is because they think sardines will be thrown into the sea".
I was with Mel and her brilliant team and you receive a comprehensive list of what is required from your case worker in time for your review so hang on if not received it yet as I'm sure you will and I never had to send any bank statements throughout the duration of my IVA. Payslips, I sent in 3 monthly, P60, increased utility bills to justify the expenditure I also sent and a revised I&E.
IVA final payment left the bank on the 26th January 2013...looking forward to a debt free future.