Pension size needed from desired retirement income and sustainable withdrawal rate

How Pension Pot Targets Work

The pension pot target divides desired annual retirement income by sustainable withdrawal rate. A 30,000 annual income at 4% withdrawal requires 750,000. At 3% for higher confidence over longer retirements, 1,000,000. The calculator also projects what your current pot plus future monthly contributions will reach at retirement, revealing surplus or shortfall. Understanding both the target and projection enables informed decisions about contribution rates, retirement age, or expected lifestyle.

Realistic Withdrawal Rate Choices

4% rate: widely tested for 30-year retirements from Trinity Study. Works most historical sequences. 3.5% rate: more conservative for early retirees facing 40+ year horizons. 3% rate: maximum caution, often unnecessarily conservative. 5% rate: works in favorable markets but fails in bad sequences. Most pension planners use 3.5-4% as reasonable middle ground. The calculator accepts whatever rate you specify.

Worked Example for Typical Saver

Desired income 30,000. Withdrawal rate 4%. Current pot 50,000. Monthly contribution 500. Years to retirement 25. Expected return 6%. Target 750,000. Projected pot approximately 505,000. Shortfall 245,000. The saver needs to either increase monthly contributions (to about 1,500 monthly would reach target), delay retirement by 5-7 years, reduce desired income, or some combination. The calculator makes the trade-off specific.

What the Calculator Does Not Model

Employer contributions — add these to monthly contribution input for realistic projection. Pension tax relief in some jurisdictions effectively boosts contributions. Variable return sequences over working years. State pension or national pension system income that reduces required pot. Inflation both on target income and contribution growth. Specific pension vehicle features (drawdown vs annuity options). The calculator shows the clean target math; real pension planning requires scenario testing and country-specific considerations.

Common Pension Target Mistakes

Using nominal income target that won't match real purchasing power 25 years later — inflate target by expected inflation rate. Ignoring employer contributions in projections. Using optimistic returns (8-10%) that may disappoint. Assuming flat contributions when salaries (and therefore employer matches) should grow. Not factoring in state pension or other retirement income sources. The calculator is a starting framework; detailed retirement planning requires comprehensive scenario analysis.