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Safe Withdrawal Rate Calculator

Find the maximum annual withdrawal rate your portfolio can support without running dry, given your investment return, inflation, and retirement timeline.

Inputs

$

Total investable assets at the start of retirement

%

Nominal (before inflation) expected annual portfolio return

%

Annual inflation rate used to grow withdrawals each year

Number of years the portfolio needs to last

%

The annual withdrawal rate you want to evaluate (as % of portfolio)

$

Social Security, pension, or other recurring income that reduces portfolio withdrawals

Results update as you type, and the address bar keeps your numbers so the link you share reopens this exact calculation.

Max sustainable withdrawal rate

5.7%

Maximum rate that sustains portfolio for 30 years

Detailed results
Annual withdrawal at desired rateFirst-year gross withdrawal before additional income offset$60,000
Portfolio balance at end of horizonRemaining balance after 30 years$3,407,569
Year of depletion (0 = sustainable)Portfolio sustained through full horizon0
Net withdrawal (after other income)Portfolio draw in year 1 after subtracting additional income$60,000

What this result means

Max sustainable withdrawal rate: 5.7%.

At a 4.00% withdrawal rate on a $1,500,000 portfolio, your plan is sustainable over 30 years. The maximum sustainable rate given a 7.00% return and 3.00% inflation is 5.70%, so your chosen rate leaves a projected terminal balance of $3,407,569. Your net first-year portfolio draw is $60,000 after accounting for other income sources.

Year-by-Year Balance Projection

Shows each year's portfolio balance after the inflation-adjusted withdrawal is taken, the withdrawal amount for that year, and the constant nominal return percentage used.

Year-by-Year Balance Projection. 30 rows, first 12 shown.
YearBalance (after withdrawal)Inflation-Adjusted WithdrawalNominal Return
1$1,543,200$61,8007%
2$1,587,570$63,6547%
3$1,633,136$65,5647%
4$1,679,925$67,5317%
5$1,727,964$69,5567%
6$1,777,278$71,6437%
7$1,827,895$73,7927%
8$1,879,841$76,0067%
9$1,933,144$78,2867%
10$1,987,829$80,6357%
11$2,043,923$83,0547%
12$2,101,452$85,5467%

How this is calculated

real_return = (1 + annual_return) / (1 + inflation_rate) − 1
annual_withdrawal = portfolio_value × desired_withdrawal_rate
net_withdrawal = max(0, annual_withdrawal − additional_income)
balance_year_n = balance_year_(n−1) × (1 + annual_return) − net_withdrawal × (1 + inflation_rate)^n
PV_factor = Σ_{t=1}^{T} ((1 + inflation_rate) / (1 + annual_return))^t
max_sustainable_rate = 1 / PV_factor

What is the safe withdrawal rate?

The safe withdrawal rate (SWR) is the percentage of your retirement portfolio you can withdraw in the first year — then adjust upward for inflation each year — without running out of money over a target retirement horizon. It is one of the most important numbers in retirement planning, translating a portfolio balance into a reliable, inflation-protected income stream.

The 4% rule and the Trinity Study

The 4% rule entered mainstream financial planning through research by William Bengen (1994) and the "Trinity Study" (Cooley, Hubbard, and Walz, 1998). Analyzing U.S. stock and bond market returns dating back to 1926, the researchers found that a 4% initial withdrawal rate — with annual inflation adjustments — allowed a balanced portfolio to survive 30-year retirements in the vast majority of historical scenarios.

The 4% figure is not a guarantee. It is a historically grounded guideline derived from a specific period of U.S. market history, a specific asset allocation (stocks and bonds), and a 30-year horizon. For many retirees today, 3.3%–3.5% is considered more conservative given lower expected returns and longer life expectancies.

Why it is a guideline, not a guarantee

The Trinity Study looked backward at what would have worked. Future returns may differ. Interest rates, valuations, and global growth expectations all influence prospective returns. A retiree starting in a period of low yields and high equity valuations faces structural headwinds that historical averages may not reflect. This is why the SWR should be treated as a starting point for analysis, not a final answer.

Sequence-of-returns risk

Even if a portfolio averages the expected return over 30 years, the order of those returns matters enormously. If poor market years arrive early in retirement — when the portfolio is at its peak and withdrawals are largest — the damage can be permanent. Selling depressed assets to fund withdrawals locks in losses and leaves fewer shares to recover when markets rebound. This phenomenon, called sequence-of-returns risk, is the primary reason average returns alone cannot guarantee sustainability. This calculator uses a constant annual return, which is the appropriate tool for understanding structural sustainability — pair it with lower-return scenarios to stress-test for a bad early sequence.

Real vs. nominal returns

Your portfolio's nominal return is the raw percentage your investments earn. The real return strips out inflation: real_return = (1 + nominal) / (1 + inflation) − 1. What matters to your purchasing power is the real return — whether your portfolio grows faster than the cost of living. At 7% nominal returns and 3% inflation, the real return is roughly 3.9%, meaning your wealth is growing in purchasing-power terms, but far more slowly than the headline number suggests.

The role of additional income

Social Security, pensions, rental income, and annuities reduce how much you need to draw from the portfolio. If guaranteed income covers your essential expenses entirely, the portfolio can be reserved for discretionary spending or legacy goals — dramatically reducing sequence-of-returns risk. This calculator lets you model that offset directly: the net withdrawal is the only amount the portfolio must supply, and even a modest Social Security benefit can shift a borderline plan into the sustainable zone.

How to use this calculator

Enter your expected portfolio value at retirement, your return and inflation assumptions, your desired withdrawal rate, and any additional income. The calculator runs a year-by-year simulation showing your balance declining (or growing) through the horizon, and also computes the mathematically exact maximum sustainable rate — the rate at which the portfolio reaches exactly $0 at the end of your horizon. Compare your desired rate to the maximum to understand your margin of safety.

Assumptions

  • Portfolio return is constant at the entered nominal rate each year; real market returns are variable and sequence-of-returns risk is not modelled by a constant-return simulation.
  • The withdrawal grows with inflation every year beginning in year one: withdrawal_year_n = net_withdrawal × (1 + inflation_rate)^n.
  • Additional income is treated as a fixed nominal amount that does not change over time; it does not grow with inflation.
  • The portfolio cannot go negative — once depleted the simulation stops and subsequent years show a zero balance.
  • No taxes are modelled on investment gains or withdrawals; gross figures are used throughout.
  • The max sustainable rate is derived from the annuity present-value formula and represents the exact theoretical rate at which the portfolio reaches $0 at the end of the horizon; actual market variability may produce different results.
  • No management fees, fund expense ratios, or transaction costs are deducted from the return.

Frequently asked questions

›What is the 4% rule?

The 4% rule is a retirement planning guideline derived from historical research (the Trinity Study, 1998) showing that withdrawing 4% of an initial portfolio value in year one, then adjusting that dollar amount upward for inflation each year, historically sustained balanced portfolios through 30-year retirements in most U.S. market scenarios. It is a benchmark, not a guarantee — future return environments may support a higher or lower sustainable rate.

›Why might the 4% rule not apply to me?

Several factors can push your sustainable rate above or below 4%: a longer retirement horizon (40–50 years requires a lower rate than 30), a lower expected real return (high valuations or low bond yields), a more conservative asset allocation, higher inflation expectations, or the absence of any guaranteed income. Conversely, substantial Social Security or pension income, a shorter horizon, or higher risk tolerance may allow a higher rate. Always model your specific numbers rather than anchoring to a single rule of thumb.

›How does inflation affect withdrawal sustainability?

Inflation erodes the purchasing power of every dollar in the portfolio and simultaneously forces the withdrawal amount higher each year to maintain the same real standard of living. At 3% inflation, a $50,000 withdrawal in year one grows to roughly $67,000 by year 10 and $90,000 by year 20. This double pressure — a rising withdrawal claim on a portfolio that must also preserve real value — is why inflation assumptions are so consequential in sustainable withdrawal analysis.

›What is sequence-of-returns risk?

Sequence-of-returns risk is the danger that the timing of investment returns — not just the average — determines whether a portfolio survives. A retiree who experiences a 30% market loss in year two must sell depreciated assets to fund withdrawals, leaving a permanently smaller base to recover. Two retirees with identical 30-year average returns but different year-by-year sequences can have vastly different outcomes. This risk is highest early in retirement when the portfolio is largest. To test your plan's resilience, re-run this calculator with lower return assumptions (e.g., 3–4%) to simulate a rough first decade.

›Should I include Social Security in my withdrawal calculation?

Yes. Social Security, pension payments, and other recurring income directly reduce how much you must withdraw from the portfolio. Enter your expected annual income from these sources in the 'Annual income from other sources' field. If those sources cover $30,000 of a $60,000 spending need, your portfolio only needs to supply $30,000 per year — effectively cutting the withdrawal rate in half. This can transform a marginally unsustainable plan into a robust one.

›What is a conservative safe withdrawal rate today?

Many financial planning researchers and practitioners now suggest 3.3%–3.5% as a more conservative baseline for new retirees, given lower expected returns from bonds, elevated equity valuations, and the likelihood of longer retirements (35–40 years) as life expectancy increases. The 4% figure remains widely cited as a 30-year guideline under historical average conditions. Retirees with significant guaranteed income, shorter horizons, or willingness to adjust spending in down markets may comfortably use higher rates. Use this calculator to find the maximum rate that works for your specific inputs.

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