I think that you will benefit well from the increases.
You have different questions: arrears of pay between February and retirement date; salary for calculation of pension and lump sum; future pension increases in line with increases for your former grade.
I think that the first two are fairly clear-cut.
This is from the Forsa website and covers future increases for pensioners.
How would this affect public service pensioners?
Under public service agreements, increases in public service pay scales are generally reflected in public service pensions that are linked to pay scales. In a response to ICTU president Kevin Callinan’s enquiry on this issue, the PSC has received written confirmation from the Minister for Public Expenditure and Reform that, if accepted, the current pensions increase policy – of maintaining parity between the pay of serving staff and pensions – will be extended for the duration of the new pay agreement.
The union has now received confirmation from the Minister that the current pensions increase policy, of maintaining parity between the pay of serving staff and pensions, will be extended for the duration of the new pay agreement.
So good news there for you; Your pension will be increased by the 1% in October and the increase in March 2023.
As you were still in employment on 2 February I expect your lump sum and pension on your retirement date will be revised and based on your revised salary effective from 2 February. Your HR will confirm that but it’s very likely. These retrospective increases were quite common in previous eras in the public sector.
You will also qualify for arrears of salary between February and retirement date.