I pay by bank card monthly payments but im always 1 or 2 weeks late on payment but always made the payment just still juggling about with money they not said anything to me about late payments?
As long as the payment is made within a few weeks of the due date they will (might) not chase, but missed payments altogether might eventually see the IVA fail, so you should get a handle on them.
Don't depend on reminders -- the first one might be a notice of breach!
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014