Hi Ann. If you are referring to paying in extra income, this should be done monthly, within 14 days of being paid. If it is a shortfall discovered at review, you will need to pay this right away, by arrangement with your IP, they could grant a longer time depending upon circumstances.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014
You should check the terms of your IVA proposal as it will stipulate when extra payments should be paid...mine were within 14 days of receipt of monies, but I know others where it was quarterly or six monthly.....your own proposal will clearly define the action you need to take.
Sharing from experiences of dealing with debt
There is a solution for everyone .... Just need to stay positive !