Pension Calculator

Retirement planning requires projecting how your current savings and future contributions will grow over your working years, then determining whether the resulting portfolio can sustain your desired income throughout retirement. The Pension Calculator uses compound growth to model portfolio accumulation and the 4 percent safe withdrawal rule, derived from historical research by William Bengen, to estimate sustainable annual income. Starting early is the single most powerful factor: a 25-year-old saving €500 per month will accumulate roughly twice as much as a 35-year-old saving the same amount, purely due to the additional decade of compounding.

Enter your current retirement savings balance, expected annual contribution, anticipated investment return and years until retirement. The calculator projects your portfolio value at retirement, estimates sustainable annual income using the 4 percent withdrawal rule and compares three return scenarios, conservative, expected and optimistic. Use this to identify the savings rate required to meet your target retirement income and to understand the impact of retiring earlier or later.

To establish your current retirement savings trajectory and identify whether you are on course to meet your target income at your planned retirement age.
When deciding how much to increase your pension contribution, to quantify the exact additional retirement income generated by each increase in monthly saving.
Before making early retirement decisions, to model the impact of a shorter accumulation period and a longer withdrawal phase on your portfolio sustainability.
When changing jobs, to evaluate different pension schemes and model the long-term difference between employer contribution rates.
For annual retirement planning reviews, to update your projection with current balance, contribution and return assumptions and recalibrate your plan.

4% Rule: A guideline suggesting that withdrawing 4 percent of your portfolio value in year one of retirement, then adjusting for inflation annually, provides a high probability of sustaining income for 30 years. Based on Bengen's 1994 research using historical US market data.

Defined Contribution Pension: A pension scheme where contributions are invested and the retirement income depends on how much was contributed and how the investments performed, unlike defined benefit schemes which guarantee a fixed income.

Compound Returns: Investment returns that are reinvested and generate further returns. Over long retirement savings periods, compounding produces the majority of the final portfolio value, often more than all contributions combined.

Sequence of Returns Risk: The risk that poor investment returns early in retirement permanently deplete the portfolio before markets recover. This is why many advisers suggest a flexible withdrawal strategy rather than a rigid 4 percent withdrawal.

The most significant retirement planning mistake is underestimating how long retirement will last. With life expectancies rising, a 65-year-old today has a significant probability of living to 90 or beyond, requiring 25 years of retirement income rather than the 15 to 20 years many people plan for. This means the 4 percent rule may be too aggressive for very long retirements; some advisers recommend 3 to 3.5 percent for early retirees. A second major mistake is not adjusting projections for inflation, a retirement income that feels comfortable today will purchase significantly less in 20 years if not inflation-linked.

Use the Retirement Gap Calculator alongside this tool to quantify the exact shortfall between your current trajectory and your target. The Safe Withdrawal Rate Calculator will help determine a sustainable income level from your projected portfolio. The Financial Independence Calculator can show what portfolio size you need to achieve financial freedom at any age using the FIRE framework.

Frequently Asked Questions

The most widely used benchmark is the 25x rule, derived from the 4 percent safe withdrawal rate, which states you need 25 times your desired annual retirement income saved. For a retirement income of €40,000 per year, you need a portfolio of €1,000,000. This assumes a 30-year retirement, a diversified portfolio and inflation-adjusted withdrawals. If you plan to retire early and need the portfolio to last 40 or 50 years, some research suggests targeting 30 to 33 times annual income, equivalent to a 3 to 3.3 percent withdrawal rate, to reduce the risk of outliving your savings.

The 4 percent rule was derived from William Bengen's 1994 analysis of US market data from 1926 to 1992. Some researchers now argue that given lower bond yields and higher equity valuations compared to historical averages, a more conservative 3 to 3.5 percent withdrawal rate better reflects current conditions. The rule also assumes a balanced portfolio of approximately 60 percent equities and 40 percent bonds, a more conservative allocation would support a lower withdrawal rate. For early retirees planning 40 or 50-year retirements, a 3 percent withdrawal rate provides substantially more protection against portfolio depletion.

Sequence of returns risk, the risk that poor investment returns occur early in retirement, is widely underestimated and can be devastating even for well-funded portfolios. A portfolio that experiences large losses in the first 3 to 5 years of retirement may never recover, even if long-run average returns are acceptable, because withdrawals during the downturn permanently reduce the base for subsequent compound growth. This is why many retirement specialists recommend holding 1 to 2 years of expenses in cash or short-term bonds at retirement, so market downturns do not force selling of equities at depressed prices during the critical early withdrawal phase.

The lump sum versus annuity decision depends primarily on your health, longevity expectations, other income sources and risk tolerance. An annuity guarantees income regardless of how long you live, it transfers longevity risk to the insurance company. A lump sum gives you flexibility and potential for higher returns if invested well, but you bear the risk of outliving the money. People in poor health or with significant other income sources often favour lump sums. Those without other guaranteed income, in good health and with a family history of longevity typically benefit more from annuity protection. Many financial advisers recommend a hybrid approach, annuitising enough to cover essential expenses and investing the remainder.

Inflation is one of the most significant threats to retirement security because it erodes the purchasing power of fixed income over time. At 3 percent annual inflation, €40,000 of income today will need to be €72,000 in 20 years to maintain the same lifestyle. This means your retirement portfolio needs to grow in real terms, after inflation, not just in nominal terms. Investment projections that use nominal returns without inflation adjustment significantly overstate real purchasing power at retirement. Always express your retirement income target in today's money and use a real return assumption, typically nominal return minus expected inflation, to ensure your projections reflect genuine purchasing power.