Your Employer Annual Reconciliation Declaration (EMP501) for the period 1 March 2018 to 28 February 2019 is due on or before 31 May. This relates to your monthly EMP201
declarations and IRP5s, IT3(a)s etc generated.
Secondly the Department of Labour has extended the date for the submission of your 2018 Return of Earnings to the Compensation Commissioner to 31 May.
As it is important to get both returns totally accurate, ask your accountant for help in any doubt.