4% Rule Retirement Withdrawal Calculator
Estimate how much you can safely withdraw from your retirement portfolio each year. Use this when planning annual retirement income to avoid outliving your savings.
About this calculator
The 4% rule, derived from the Trinity Study, suggests retirees can withdraw 4% of their portfolio in year one and adjust for inflation each subsequent year with a high probability of the portfolio lasting 30 years. The gross annual withdrawal is calculated as: annualWithdrawal = portfolioValue × (withdrawalRate / 100). After accounting for taxes, the net amount is: afterTaxWithdrawal = annualWithdrawal × (1 − taxRate / 100). For example, a $1,000,000 portfolio at 4% yields $40,000 gross; at a 20% tax rate, the after-tax income is $32,000. Inflation erodes purchasing power over time, so the real value of a fixed withdrawal decreases annually by the inflation rate. Adjusting your withdrawal rate upward in low-return environments can deplete savings prematurely.
How to use
Suppose you have a $800,000 portfolio, a 4% withdrawal rate, a 22% tax rate, and expect 25 years of retirement with 3% inflation. Step 1 — Gross annual withdrawal: $800,000 × (4 / 100) = $32,000. Step 2 — After-tax withdrawal: $32,000 × (1 − 22 / 100) = $32,000 × 0.78 = $24,960. This is your estimated annual after-tax income. Enter all five fields and the calculator returns your net spendable income per year.
Frequently asked questions
What is the 4% rule and is it still valid for retirement planning today?
The 4% rule originates from the 1994 Trinity Study, which found that a 4% initial withdrawal rate sustained a balanced portfolio for at least 30 years in most historical market scenarios. Critics argue that today's lower bond yields and higher valuations make 3% to 3.5% more conservative and prudent. It remains a useful starting benchmark but should be adjusted based on your specific asset allocation, retirement length, and spending flexibility. Regularly reviewing your withdrawal rate as market conditions change is strongly recommended.
How does tax rate affect how much money I actually receive from my retirement withdrawal?
The tax rate directly reduces the gross amount you withdraw from your portfolio. If you withdraw $40,000 and face a 25% effective tax rate, your spendable income is only $30,000. Traditional IRA and 401(k) withdrawals are taxed as ordinary income, while Roth account withdrawals are generally tax-free. Strategic Roth conversions before retirement can significantly lower your effective tax rate and increase after-tax income.
How does inflation erode retirement withdrawals over time?
Inflation reduces the purchasing power of a fixed dollar withdrawal each year. At 3% annual inflation, $32,000 today buys the equivalent of only about $17,700 in purchasing power after 20 years. The 4% rule traditionally accounts for this by allowing annual inflation-adjusted increases to the withdrawal amount. However, this means your portfolio must grow enough in good years to fund larger nominal withdrawals in later retirement years.