How pension accumulation works
A defined contribution retirement plan accumulates value through regular personal contributions, employer matching contributions, and compounded investment returns over decades.
Over a 30-year career, compounding returns typically generate 60% or more of your final accumulated retirement wealth, heavily outweighing the principal contributions paid in.
Worked example: Retirement pot accumulation
Starting with an initial balance of $25,000 at age 30 and contributing $500 monthly ($300 employee + $200 employer) at an average annual return of 5.0% minus 0.75% fees yields a projected fund of approximately $592,000 at age 65.
Applying the standard 4% safe withdrawal rule to this fund yields an estimated initial retirement income of $1,975 per month ($23,700 per year).
Inputs for the pension calculator
Ages & Timeline
Enter your current age and planned retirement age to calculate the compounding investment horizon.
Contributions & Growth
Enter monthly personal and employer contributions, along with net annual investment returns and inflation assumptions.
CALCULATOR QUESTIONS
Pension calculator questions
What is the 4% retirement rule?
The 4% rule (originating from the Bengen study) suggests withdrawing 4% of your total retirement portfolio in year one, adjusted for inflation thereafter, has historically allowed a balanced portfolio to survive at least 30 years.
How do fees affect retirement wealth?
Even a 1% ongoing platform and management charge can erode more than 20% to 25% of your final portfolio value over a 30-year accumulation period due to lost compound growth.
What is the difference between defined contribution and defined benefit?
A defined contribution (DC) plan depends on what you pay in and market performance. A defined benefit (DB) pension guarantees a predetermined annual income based on salary and service years.