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Systematic Withdrawal Plan (SWP) Calculator
Systematic Withdrawal Plan (SWP) Calculator
Money Lasts
37 yr 10 mo
Withdrawal Plan Analysis
The $750,000 corpus runs out in 37 yr 10 mo, short of your 40-year target. That is a 4.80% withdrawal rate — well above the traditional 4% safe-withdrawal guideline. To last the full 40 years with a 2.5%-per-year inflation raise, start at about $2,914.86 per month instead (or $34,978.33/yr).
*Assumes a constant annual return and fixed inflation adjustment; real market returns vary year to year and sequence risk is not modeled. Educational only, not financial advice.
Turning a Nest Egg Into a Paycheck
Saving for retirement is only the first act; spending it back down without running out is the second. A Systematic Withdrawal Plan — SWP for short — is the reverse of a systematic investment plan: instead of contributing monthly and watching a balance grow, you draw a fixed or inflation-adjusted amount each month or year and hope the portfolio lasts the rest of your life. It is the mechanism behind every retiree's monthly income that comes from a 401(k), IRA, or taxable portfolio, and it is exactly what a Roth conversion, RMD schedule, or early-retirement budget is built on top of. The question every pre-retiree asks is simple: if I withdraw this much, how long does my money last? The answer is more delicate than it looks because the withdrawal rate, the portfolio's return, and inflation together decide it — and the margin between 'lasts 35 years' and 'runs out at 84' can be one percentage point. This calculator answers the question directly, with both fixed and inflation-adjusted withdrawals, and tells you the maximum sustainable amount when your chosen draw falls short.
Growth Compounds, Then the Withdrawal Comes Out
Each period the balance earns interest first (balance × rate-per-period, converted to monthly for monthly plans), the interest is added, and then that period's withdrawal is taken — never more than the balance, so depletion is detected the moment the account hits zero. With inflation indexing, the withdrawal itself grows every period by the inflation rate, so a $3,000 first-month draw might be $3,800 by year ten. The simulation runs to your horizon or to depletion, whichever comes first, and reports exactly when. Alongside the simulation the tool solves the sustainable withdrawal analytically: for a fixed draw it is the loan-payment formula in reverse — the amount you can withdraw each period so the balance hits exactly zero at the end of your horizon. For an inflation-raising draw it converts your return to a real rate (return divided by inflation, minus one) and uses the present value of a growing annuity. That gives you not just 'your plan fails' but 'start at this amount instead and it will exactly last your horizon'
Expert Insights
The 4% Rule Is a Floor Discussion, Not a Ceiling
The famous 4% safe-withdrawal rate was derived for a 30-year retirement at a 95% survival level across historical US market sequences. For a 40+ year early retirement the sustainable rate drops toward 3–3.5%; for a 20-year horizon with modest growth tolerance it can rise above 5%. Your withdrawal rate should be set by your horizon and risk tolerance, not by a single famous number.
Inflation Indexing Costs More Than Intuition Suggests
A flat $3,000/month draw over 35 years costs $1.26 million of withdrawals. Raise that $3,000 by 2.5% annually, and total withdrawals balloon to roughly $1.9 million. The inflation adjustment feels small each year but compounds into the single biggest pressure on the plan. That is why the calculator shows both modes — the gap between them is the price of maintaining your standard of living.
Guardrails Beat a Fixed Number
Sophisticated retirees use flexible rules — cut spending 10% after a down year, take a raise after a big up year — rather than a fixed draw no matter what. Those guardrail systems survive meaningfully more market sequences than any fixed rate. This tool's sustainable-withdrawal output gives you the fixed anchor; treat actual spending as a range around it, not a constant.
Actionable Tips
- 1
Set Your Horizon Before You Set Your Draw
Decide the number of years the money must last first (use life expectancy plus a margin, often age 95–100). Then run the calculator backward: if your target draw depletes early, the sustainable-amount output tells you precisely what to trim today so the plan lasts the full horizon.
- 2
Test at One Point Lower Return
Whatever return you assume, run it again one percentage point lower and see if the plan still survives. If the verdict flips, your plan is fragile to a modest market disappointment — lower the draw or add a margin now, not after a bad year.
- 3
Re-run Annually With the Real Balance
Treat the output as a one-year plan. At year-end, plug in the actual balance and repeat. Early trims to withdrawals are cheap; late ones are painful. Annual review converts a static projection into a living income plan that adapts as returns and expenses change.
Real-World Examples
Rita's 4% Reality Check
Rita retired at 60 with $900,000 and took the flat $36,000 (4%) her advisor suggested. This calculator showed that at 6% return with no inflation raises the money lasts 32 years, but with 2.5% annual raises it drops to 26 — running out at 86. She switched to a 3.6% initial draw with inflation indexing, which the tool confirmed survives past 95, and paired it with part-time consulting for the first five years.
Ben and Clara Refuse the Cut
At 62 and 64, the couple wanted $50,000 a year from $1.1 million — a 4.5% withdrawal rate. The tool said the inflation-adjusted plan fails at 89, but it also computed the sustainable amount: $43,400. Rather than cut spending across the board, they identified $6,600 of discretionary travel they could delay until their mid-70s, kept the early years leaner, and the same money now outlives their plan.
The Widow Who Rebuilt Her Income
After her husband passed, Maria inherited a $700,000 portfolio and needed $2,900 a month. The simulation showed that at her conservative 4.5% return the balance lasted only 21 years, but with a modest 5.5% allocation shift it lasted 27. More useful was the sustainable figure of $2,450 her advisor suggested for the fixed draw; she bridged the $450 gap with a small immediate annuity that guaranteed that slice for life.
Glossary of Terms
- Systematic Withdrawal Plan (SWP)
- A schedule for drawing a fixed or inflation-adjusted amount from an investment portfolio at regular intervals — the income mirror image of regular investing contributions.
- Withdrawal Rate
- The annual withdrawal expressed as a percentage of the starting portfolio — the quick gauge used to sanity-check whether an income plan is aggressive or conservative.
- Sustainable Withdrawal
- The maximum periodic amount that, under the assumed return and inflation settings, exactly exhausts the portfolio at the end of the chosen horizon — no more, no less.
Frequently Asked Questions
Everything you need to know about this topic.
Ivy Sinclair-Wren
Financial Chaos Analyst
Ivy Sinclair-Wren is a Financial Chaos Analyst covering investing, AI, wealth psychology, and the emotional consequences of opening finance apps during market crashes. Based in Melbourne, she specializes in demystifying the US tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.