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About the Retirement Calculator
Planning for retirement is an exercise in projecting an uncertain future: you do not know precisely how long you will live, what investment returns will be, how inflation will evolve, or what healthcare will cost. Despite this uncertainty, building a retirement projection is essential — it gives you a framework for decision-making, reveals whether your savings rate is sufficient, and identifies how sensitive your outcome is to key assumptions. This calculator combines your current savings, contribution rate, expected returns, planned retirement date, and income needs into a comprehensive projection.
How the calculation works
The calculator models two phases: accumulation (your working years) and distribution (retirement). During accumulation it projects your portfolio value at retirement using compound growth on both your current balance and ongoing contributions. During distribution it models how long the portfolio sustains your desired annual income, accounting for inflation and ongoing returns on the remaining balance. A 40-year-old with $180,000 saved, contributing $15,000/year at 7% average return, retiring at 65 and needing $70,000/year projects a retirement portfolio of ~$1.8M — sufficient to support inflation-adjusted withdrawals for ~30 years.
The 4% safe withdrawal rate
The 4% rule provides the bridge between your accumulation target and your annual income need. Research from the 1998 Trinity Study found that a 50/50 stock-bond portfolio could sustain 4% annual withdrawals (inflation-adjusted) with high success rates across historical 30-year periods. Multiply expected annual expenses by 25 to get your target portfolio size. For retirement horizons beyond 30 years — increasingly common as life expectancy lengthens — a withdrawal rate of 3.3–3.5% provides meaningfully better odds of portfolio survival.
Social Security integration
Social Security benefits reduce the portfolio size you need, since they provide guaranteed income that partially covers annual expenses. Each year you delay claiming between 62 and 70 increases your benefit by ~5–8%. The break-even age for delaying from 62 to 70 is ~82 — if you live past that point, delaying typically provides more lifetime income. For two-income households, coordinating claiming strategies between spouses can meaningfully increase lifetime household Social Security income.
Healthcare costs in retirement
Healthcare is consistently the most underestimated retirement expense. Fidelity estimates a 65-year-old couple retiring today will need ~$315,000 for out-of-pocket healthcare costs in retirement, excluding long-term care. For retirees under 65 who must purchase private coverage before Medicare eligibility, premiums can exceed $12,000–$18,000/year for a couple. Long-term care carries a median annual cost of $50,000–$100,000 depending on level and location. Integrating realistic healthcare cost assumptions, rather than approximating with a generic multiplier, significantly improves projection accuracy.
Asset allocation in retirement
Many financial planners now advocate maintaining a higher equity allocation (50–70% stocks) well into retirement to support the 20–30 year growth need of the portfolio, using a bucket strategy — two to three years of living expenses in cash or short-term bonds as a buffer against sequence-of-returns risk. The right allocation balances your need for long-term growth against your tolerance for portfolio volatility during down markets.
Frequently Asked Questions
What if my projection shows I am significantly underfunded?
Being behind on retirement savings is common and addressable while working years remain. The most impactful levers are: increasing your savings rate, working longer (even a few extra years dramatically improves outcomes via additional accumulation and fewer years of distribution), reducing planned retirement spending, and maximising tax-advantaged accounts. A financial planner can help prioritise these for your specific situation.
How do taxes affect retirement income?
Traditional 401(k) and IRA withdrawals are taxed as ordinary income. Roth withdrawals are tax-free. Long-term capital gains from taxable accounts are taxed at preferential rates — 0% for income below ~$47,025 for single filers in 2024. Social Security benefits are partially taxable above certain income thresholds. Strategic sequencing of account withdrawals can significantly reduce lifetime tax liability in retirement.
Should I count on an inheritance in my retirement planning?
Financial planners generally advise against relying on an inheritance as a meaningful retirement planning component. Life expectancy has increased substantially, meaning parents' assets may be needed to fund their own extended care. Long-term care costs can deplete estate assets rapidly. An inheritance received is a financial bonus; planning as if it will not materialise keeps your retirement plan self-sufficient.
How do I account for inflation in my retirement projection?
The most straightforward approach is to work in real (inflation-adjusted) dollars — using a real return rate of ~4–5% for equities (nominal return minus inflation) and expressing all income needs in today's purchasing power. This cleanly separates the investment return question from the inflation assumption and makes the projection easier to interpret.
Disclaimer
Past performance does not guarantee future returns. Investment markets carry risk including potential loss of principal.
This calculator is for informational and educational purposes only. Results are estimates based on the inputs you provide and assumptions that may not reflect your actual situation. It does not constitute financial, investment, tax, legal, or accounting advice. Verify results independently and consult a qualified professional before making financial decisions. Digital.Finance makes no guarantee of accuracy or completeness.