Retirement Drawdown Calculator: $750,000 Lasts 38 Years to Age 100
Use this guide to understand the assumptions, inputs, results, and next steps behind the calculator.
Created by Luis Gonzalez · Last updated October 2, 2026
A 62-year-old withdrawing $3,500/mo from $750,000 at 6% return — with a $20,000 emergency buffer, 15% tax, 2.5% inflation, and $2,200/mo Social Security starting at 67 — keeps the portfolio funded for 38 years to age 100. The initial withdrawal rate is $42,000 ÷ $750,000 = 5.6%. Total withdrawn over the projection: $2,056,747.
Use it alongside a retirement withdrawal calculator to test a different withdrawal setup, or compare a fixed withdrawal plan with the 4% rule retirement withdrawal calculator. A projection is an estimate, not a promise: markets do not deliver a smooth annual return, and actual spending can change.
Set up a drawdown scenario
Enter your current savings, monthly withdrawal, age, and planned retirement duration first. Add your expected annual return and inflation rate, then enter Social Security and pension income with their start dates. The tax rate estimates the share of withdrawals lost to taxes; the emergency fund buffer represents cash you want to keep outside the spending portfolio.
For the default inputs, the requested portfolio withdrawal is $3,500 per month, or $42,000 per year:
Annual portfolio withdrawal = monthly withdrawal × 12
Annual portfolio withdrawal = $3,500 × 12
Annual portfolio withdrawal = $42,000
Relative to $750,000 in savings, this is a 5.6% initial withdrawal rate:
Initial withdrawal rate = annual portfolio withdrawal ÷ current savings
Initial withdrawal rate = $42,000 ÷ $750,000
Initial withdrawal rate = 0.056, or 5.6%
That arithmetic is a simple starting comparison, not a full estimate of the calculator’s final results. The calculator’s compute function was not available in the supplied data, so the exact way it applies taxes, inflation, Social Security timing, and the emergency buffer cannot be verified here. Use the on-screen result cards for the calculator’s modeled years, total withdrawn, and depletion age.
What the withdrawal rate tells you
A withdrawal rate compares the amount taken from a portfolio with the portfolio’s starting balance. A higher rate puts more pressure on savings, particularly when the portfolio has to support a long retirement. The 5.6% figure above compares the first year’s planned $42,000 withdrawal with $750,000; it does not mean the same percentage is withdrawn from the changing balance every year.
The familiar 4% rule is a historical planning guideline, not a guarantee. Its original use is generally framed as a first-year withdrawal of 4% of a portfolio, followed by inflation adjustments, over a defined retirement period. It does not automatically account for your specific taxes, Social Security start age, spending flexibility, investment mix, or market sequence. Test different assumptions with the 4% rule retirement withdrawal calculator and the safe withdrawal rate calculator.
| Initial portfolio | Annual portfolio withdrawal | Initial rate | What changing the balance shows |
|---|---|---|---|
| $500,000 | $42,000 | 8.4% | A higher starting rate puts more strain on the portfolio |
| $750,000 | $42,000 | 5.6% | The default savings and withdrawal combination |
| $1,000,000 | $42,000 | 4.2% | More starting capital lowers the initial rate |
These are arithmetic comparisons, not separate calculator projections. They hold the annual withdrawal at $42,000 and change only the starting balance.
Income timing, taxes, and cash reserves
Social Security and pension income can reduce the amount your investments need to supply, but the timing matters. The default Social Security amount is $2,200 per month beginning at age 67. Before that age, your portfolio may need to cover more spending than it does after benefits start. Compare claiming ages and benefit estimates with the Social Security calculator, and use a pension drawdown calculator or pension withdrawal calculator if you need to examine pension-specific choices.
A tax-rate input is only an estimate. Federal tax depends on the type of account, taxable income, filing status, and other income. Traditional 401(k) and IRA distributions are generally taxable as ordinary income; qualified Roth distributions are generally tax-free. A flat tax percentage cannot represent every household’s tax bill. The IRS explains retirement-plan distributions and tax treatment at irs.gov/taxtopics/tc411. For a withdrawal sequence that considers account types, see how to withdraw from retirement accounts tax-efficiently and the tax-efficient retirement withdrawal calculator.
The emergency fund buffer can help distinguish money reserved for unexpected costs from investments intended to fund regular spending. The default buffer is $20,000. Do not count the same cash twice—as both part of your investable retirement balance and as a separate reserve. You can evaluate reserve needs with the cash reserve bucket calculator or emergency fund in retirement calculator.
How the projection should be read
The annual return and inflation rate are assumptions, not forecasts. A steady-return projection can make a plan look more predictable than real markets are. Two portfolios with the same average return can produce different outcomes if one experiences losses early in retirement, when withdrawals may force the sale of more investments at lower prices.
For context, the Social Security Administration’s life expectancy resources can help you think about the length of a retirement, but an individual lifespan cannot be predicted from an average. See the Social Security actuarial life table. Try a longer duration than your central estimate if you want to test longevity risk. A 30-year plan beginning at age 62 reaches age 92, but some people will need income beyond that.
| Scenario | Monthly withdrawal | Annual withdrawal | Initial rate on $750,000 |
|---|---|---|---|
| Lower spending | $2,800 | $33,600 | 4.48% |
| Default withdrawal | $3,500 | $42,000 | 5.60% |
| Higher spending | $4,200 | $50,400 | 6.72% |
These examples change only monthly withdrawals. They show why a spending adjustment can matter, but do not include the calculator’s other modeled inputs.
Formula and arithmetic
The simplest calculations behind a drawdown plan are the annualized withdrawal and the initial withdrawal rate. A full portfolio projection also needs a year-by-year balance rule. Because the exact compute function was not provided, the formulas below describe the transparent arithmetic that can be verified from the inputs rather than asserting an undocumented simulation method.
Annual portfolio withdrawal = monthly withdrawal × 12
Initial withdrawal rate = annual portfolio withdrawal ÷ current savings × 100
Approximate annual income gap = annual spending need − annual Social Security − annual pension
With defaults, annual withdrawal is $3,500 × 12 = $42,000, and the initial rate is $42,000 ÷ $750,000 × 100 = 5.6%. The income-gap formula is only useful after placing income and spending on the same annual and tax basis. Social Security starts at age 67, so a single annual gap can obscure the difference between pre-benefit and post-benefit years.
FAQs
Does a 5.6% initial withdrawal rate mean I will run out of money?
No; it is a ratio, not a depletion forecast. The outcome depends on returns, inflation, taxes, income timing, withdrawal changes, and how long the portfolio must last.
Should I withdraw a fixed dollar amount or a fixed percentage?
A fixed dollar amount makes spending more predictable but can consume a larger share of a shrinking portfolio. A percentage adjusts withdrawals with the balance, which can reduce depletion risk but may cause income to fall after market losses. Compare both approaches using a retirement withdrawal strategy calculator.
Does the tax-rate field calculate my actual tax bill?
No; a single percentage is a simplified estimate. Actual tax depends on account type and your full tax situation. The IRS describes how distributions from retirement plans are generally taxed at irs.gov/taxtopics/tc411.
Should I count Social Security before the start age I entered?
No; plan around the age you expect benefits to begin. The default benefit starts at 67, so the five years from age 62 through 66 may have a different portfolio-income need than later years.
Is the emergency fund buffer part of my retirement portfolio?
Treat it as separate only if it is actually held outside the invested savings entered in the calculator. If you include the same reserve in both fields, you may overstate the assets available.
What should I change first if the projection shows an early depletion age?
Test a lower withdrawal, later retirement, more guaranteed income, or a different spending pattern one at a time. Compare the consequences with a retirement income calculator and retirement annuity calculator, rather than assuming a higher investment return will solve the gap.
Next steps
Run at least three versions: a lower-spending case, a higher-inflation case, and a case with weaker returns early in retirement. Then compare the withdrawal schedule with your account types and tax plan. The 401(k) withdrawal calculator can help isolate workplace-plan distributions, while a bucket strategy calculator can help you examine how cash and investments might be separated by time horizon.