public service tax free lump sum optimise

hi

wish to know when i retire soon and short a few years service have some funds in an AVC in order to maximise my lump sum ie multiply amount by 1.5, is calculation based on best 3 yrs gross earnings in last 10 yrs or best 3 consecutive in last 10 yrs, i got an official document from employer stating gross earnings for each yr of last 10.

If above is not correct i also got a document which references Nett Taxable income for each of last 10 yrs 2010 to 2021 again should i base my lump sum calculation ie multiply by 1.5 on these figures and if so 3 consective or best 3 of last 10.

I have completed more than 27 yrs in a 30yr full pension public service job

many thanks for replies

I can't say for sure but Class D gives you a pension on your gross earnings, Class A on net earnings. I think.

Right im class A ie joined after1995 but also is it best 3yrs earnings last 10, or best 3 consecutive yrs of last 10?