This page explains how the HSE Pension Calculator Ireland produces estimates. The formulas are built for planning, not for pension administration, so the assumptions are explicit and easy to audit.
For classic public sector style models, annual pension is estimated as pensionable salary multiplied by reckonable years of service multiplied by 1/80. Lump sum is estimated as pensionable salary multiplied by reckonable years multiplied by 3/80.
For Single Scheme modelling, the calculator applies a 0.58% annual pension accrual and 3.75% lump sum accrual to the salary entered. This gives users a practical planning baseline while keeping the code transparent.
Pensionable salary is the salary figure used for pension accrual calculations. Years of service means the reckonable service expected at retirement. Retirement age factor is a planning adjustment to reflect earlier or later retirement than age 66.
The age adjustment uses a 4% reduction per year before age 66 and a 2% uplift per year after age 66, with caps to avoid extreme results. Career Average modelling applies a 0.96 salary factor to mimic an average-pay outcome instead of using full final salary.
The tool caps service and retirement age inputs to avoid unrealistic outputs. It does not automatically model service purchase, integration with the contributory State Pension, spouse benefits, ill-health retirement, pension abatement, or detailed salary history revaluation.
If your case involves part-time service, preserved benefits, unusual pay elements, transfer values or breaks in service, use the estimate as a conversation starter rather than an answer.
This methodology is educational. It does not replace HSE pension estimates, Revenue guidance, scheme rules, employment contracts or regulated financial advice. If you are close to retirement or making an irreversible pension decision, you should verify all figures with official documentation and qualified advisers where appropriate.