So having gone back into ROS and the Form 11, it now seems that its change calculations (again).My colleagues attended an Irish tax institute conference today joined by revenue and one of the points mentioned was
"Revenue are aware of Form 11 issues and are currently working on or have already resolved same. Eg DIRT was being charged at 40% and this is now corrected to 33%.
No DIRT is no being calculated for me, whereas it had done so at 40%. Income continuance was not attracting a credit, but is now.
@Mathematician if you get a chance can i trouble you to check if your return is still showing a DIRT amount @40% please? ...or anybody else who is in process of preparing a return.