Sustainable spending this supports (4% rule)
$1,333 / month
On its own this supports a frugal retirement, but combined with an average Social Security benefit it can cover a modest lifestyle, particularly in lower-cost areas or with a paid-off home. Using the 4% rule, $400,000 supports about $1,333 per month ($16,000 per year) of inflation-adjusted spending — before any Social Security or pension income.
Open the calculator$1,333
4% rule
$16,000
$1,167/mo
about 5 years
"Can I retire?" really means "can my savings cover my spending for the rest of my life?" — so the answer hinges on your budget, not just the account balance. A common shortcut is the 4% rule: withdraw 4% of the portfolio in year one and adjust for inflation after that, which historical US data suggests survives a roughly 30-year retirement most of the time.
The table below flips the question around: pick a monthly spending level and see how long $400,000 would actually last under our assumptions. Remember that Social Security alone replaces a meaningful share of income for most American retirees, so your portfolio rarely has to do all the work.
| Monthly spending | Annual spending | How long it lasts | Verdict |
|---|---|---|---|
| $1,000 | $12,000 | 60+ years | Sustainable — at or below the 4% rule |
| $2,000 | $24,000 | about 29 years | Workable for a shorter or later retirement |
| $3,000 | $36,000 | about 15 years | Only viable with substantial other income |
| $4,000 | $48,000 | about 11 years | Only viable with substantial other income |
| $5,000 | $60,000 | about 8 years | Depletes quickly — likely too high |
| $7,500 | $90,000 | about 5 years | Depletes quickly — likely too high |
Spending is in today's dollars and assumed to rise with inflation. "Sustainable" rows stay at or below the 4% rule, where the portfolio is expected to outlast a 30-year retirement under these assumptions.
The age matters mostly through retirement length and Social Security timing. Retiring at 65 with $400,000 means the money must cover roughly 25–30 years, which is what the 4% rule targets. Retiring at 50 means stretching it over 40+ years, so a lower withdrawal rate (closer to 3–3.5%, or about $1,083 per month) is more prudent.
About $1,333 per month at a 4% withdrawal rate, $1,167 at a conservative 3.5%, and $1,667 at an aggressive 5%. Higher rates raise the odds of depleting the portfolio during a long retirement.
No — these figures are portfolio-only. The average Social Security retirement benefit is in the neighborhood of $2,000 per month (2025), so a couple with two benefits plus $1,333 from savings may have a very different answer to "can I retire?" than the portfolio number alone suggests.
That is the biggest risk to this plan — known as sequence-of-returns risk. A deep downturn in the first few years, combined with fixed withdrawals, depletes a portfolio much faster than the averages imply. Common defenses are keeping one to three years of spending in cash or short-term bonds, and being willing to cut spending temporarily after bad years.
Early retirement lengthens the drawdown period and delays Social Security, so the bar is higher. FIRE-style planning typically targets 25–33× annual spending. At 25×, $400,000 supports about $16,000 per year; at a more conservative 33×, about $12,121 per year. If your annual budget is below those numbers, early retirement is at least arithmetically plausible.
The full calculator lets you set your actual age, planned retirement age, ongoing contributions, and withdrawal strategy on top of the $400,000 starting point — with a year-by-year projection chart.
Open the calculator with $400,000Disclaimer: This page is an educational estimate based on simplified assumptions, not financial advice. Market returns vary, and your taxes, fees, and personal circumstances will change the outcome. Consider consulting a qualified financial advisor before making retirement decisions.