How It Works
Defined-benefit pensions multiply a per-year accrual rate by years of service and a salary measure.
Annual pension = final salary x accrual rate x years of service.
- The replacement ratio shows the pension as a percentage of final salary.
- A higher accrual rate or more years of service raises the pension.
Worked Example
$60,000 final salary, 1.5% accrual, 30 years of service.
A 1.5% accrual over 30 years replaces 45% of final salary, giving a $27,000 annual pension. Combined with other savings, this funds retirement.
Understanding Defined-Benefit Pensions
What this calculator does and who it helps
This calculator estimates the income from a defined-benefit pension, the type that promises a set annual amount based on your salary and how long you worked, rather than on investment performance. It shows the annual and monthly pension and what share of your final salary it replaces.
It is useful for employees in salary-based pension schemes who want to picture their retirement income, and for anyone weighing a job with such a scheme or deciding how much extra to save on top.
How the pension formula works
The core formula multiplies three things: your salary, the accrual rate, and your years of service. The accrual rate is the slice of salary you earn as pension for each year worked, so a 1.5% rate over 30 years builds up to 45% of salary.
In figures, a $60,000 final salary with a 1.5% accrual over 30 years gives $60,000 times 0.015 times 30, which is $27,000 a year. Both a higher accrual rate and more years of service lift the pension, and the two combine multiplicatively.
How to read the replacement ratio
The replacement ratio expresses the pension as a percentage of your final salary, which is an intuitive way to judge whether it will be enough. A 45% ratio means the pension alone replaces under half your working income.
Most planners suggest aiming for around 70 to 80% of pre-retirement income from all sources combined. So a defined-benefit pension often forms a solid base that you supplement with personal savings, investments, or a state pension.
Common mistakes to avoid
Assuming the pension alone will be enough is a frequent error. Because the replacement ratio is often well below 100%, planning for additional income sources is usually essential to maintain your lifestyle.
Another is overlooking early-retirement reductions, which can cut the pension if you start it before the scheme’s normal age. Treating the figure as after tax, when pensions are generally taxable, can also overstate your spendable income.
Tips for getting the most from a pension
Staying longer in a generous scheme can be valuable, since each extra year of service directly raises the pension. If you are weighing a job change, factor the pension into the total package, not just the salary.
Check whether your scheme is based on final salary or career average, and whether pensions increase with inflation once in payment, as these details shape the real value of your income. Topping up with separate savings helps close the gap to your target replacement ratio.
Limitations of this estimate
This calculator uses a single salary figure and a constant accrual rate, and shows the unreduced starting pension. It does not model career-average revaluation, early-retirement reductions, scheme-specific caps, or inflation increases after the pension begins.
It also excludes tax and any other retirement income. Pension schemes differ widely, so treat the result as a general estimate and confirm your exact entitlement with your plan administrator.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.