Calculator
Savings Distribution Calculator
Savings Distribution Calculator
Ending Balance
$85,939.67
Distribution Analysis
$1,500 a month gradually draws the $250,000 down to $85,939.67 over 15 years. You take $270,000 in distributions while interest adds $105,939.67. The fund survives the full horizon with a comfortable cushion.
*Assumes a constant rate and fixed periodic withdrawals. Real savings rates vary, and this tool does not model tax, inflation, fees or investment returns. Educational only, not financial advice.
How Long an Income Stream Really Lasts
Saving is only half the equation; spending it back down is the other half. A savings distribution calculator answers the decumulation question: if you start with a balance, earn interest and draw a fixed amount every month or year, how long does the money last, and what is left at the end of your horizon? It is the mirror image of a compound interest projection, and for anyone living off savings, it is arguably the more important half of the maths. The question is everywhere in Australian financial life. Retirees bridging from super to the Age Pension need to know whether the balance survives the gap. Parents budgeting private school fees from a lump sum need a runway that outlasts year twelve. Anyone taking a career break and living off a cash pile is running a drawdown without calling it one. Withdraw too fast and the balance evaporates years before it should; withdraw too slowly and you leave lifestyle on the table. The arithmetic of interest versus withdrawals is not intuitive, which is why every serious income plan starts with this calculation.
Interest Accrues, Then the Withdrawal Comes Out
The simulation runs period by period. Each period the balance first earns its interest, calculated as the balance times the annual rate divided by the number of periods per year, using monthly compounding for monthly withdrawals and annual for annual ones. The interest is added to the balance and then the fixed withdrawal is subtracted, never more than the balance itself. The cycle repeats across the full horizon, tracking the running balance, total withdrawn and total interest earned. Depletion is detected the moment the balance hits zero, and the tool reports exactly when it happened rather than just the end state. One relationship drives everything: if the withdrawal is smaller than one period's interest, the balance grows forever; if it equals the interest, the balance holds flat; if it is larger, the balance declines. But the decline is not linear. As the balance shrinks, the interest shrinks with it, so the same withdrawal takes a proportionally bigger bite and the final stretch collapses quickly. That accelerating tail is why drawdown answers surprise people, and why the tool iterates month by month instead of trusting a rough multiple.
Expert Insights
The Interest-to-Withdrawal Ratio Is the Only Rule You Need
Compare your periodic withdrawal to one period of interest on the starting balance. Withdraw less than the interest and the fund never dies; withdraw exactly the interest and it holds flat indefinitely; withdraw more and it declines. At four percent on two hundred and fifty thousand dollars, monthly interest is about eight hundred and thirty dollars, so a fifteen-hundred-dollar draw exceeds it and the fund runs down. Compute that ratio before choosing any withdrawal amount, because everything else is detail.
The End Collapses Faster Than the Beginning
Drawdowns are deceptive: the early years look gentle because the large balance keeps throwing off interest, but as principal shrinks, interest falls too and the same fixed withdrawal takes a bigger bite. Balances routinely survive eighty percent of a planned horizon only to vanish in the final stretch. Do not read a healthy mid-point balance as safety. The runway shortens exactly when you can least afford it, so build the plan around the depletion date, not the halfway checkpoint.
Treat the Rate as a Moving Target, Not a Constant
Australian savings rates follow the RBA and can fall several percentage points within a couple of years, while term deposit rates lock only for the term. A drawdown plan that barely survives at four percent can fail quickly at two. This calculator holds the rate constant precisely to force you to choose an assumption. Run the plan at a conservative rate rather than today's promotional one, and keep a cushion above the smallest balance you can tolerate, because sequence and rate risk both bite hardest late in the drawdown.
Actionable Tips
- 1
Start From the Interest, Not the Spending
Before setting a withdrawal, calculate one period of interest on your balance and see how much of your budget it covers. The gap between interest and spending is the rate at which you are consuming principal. Making that number explicit turns an emotional decision into an arithmetic one, and often reveals that a modest spending trim flips the plan from depleting to sustainable without touching the balance at all.
- 2
Ladder Term Deposits for Known-Date Spending
For money with a fixed job, such as six years of school fees, splitting the balance across term deposits maturing each year removes reinvestment risk while typically beating an everyday savings rate. Model each year's draw against the maturing tranche, and keep the near-term money liquid. The projection here shows whether the blended rate supports the plan, or whether the draw is quietly eating into principal you expected to preserve.
- 3
Coordinate the Draw With Your Other Income Layers
Most Australians do not live on savings alone: super pensions, part-time work, rent and eventually the Age Pension stack together. Model the savings draw as the gap-filler between those layers rather than the whole budget, and re-run the numbers whenever a layer changes. Drawing less from savings while a part-time income lasts can extend the runway by years, and deferring drawdown lets compounding work while other sources cover the bills.
Real-World Examples
Jenny Bridges to Her Pension Age
Jenny retired at sixty with two hundred and fifty thousand dollars in cash and super she could not yet access tax-free, planning to live on savings until her Age Pension age. Drawing fifteen hundred a month against four percent interest, the projection showed the fund lasting just past her pension eligibility with a small remainder. She trimmed the draw by a hundred and fifty dollars a month, bought herself a comfortable margin, and entered the pension system with her buffer intact.
The O'Briens Fund Six Years of Fees
With two kids starting at a private college, the O'Briens had forty-eight thousand dollars earmarked for fees and wanted it to survive all six years without new contributions. The calculator showed their planned six-hundred-dollar monthly draw outpacing interest at four and a quarter percent, exhausting the fund in year five. Splitting the difference, a five-hundred-dollar draw with the shortfall covered by salary, kept the runway past graduation and taught them to check the interest-to-draw ratio before every school year.
Raj Learns Why His Super Kept Shrinking
Raj drew twenty-six thousand a year from a four-hundred-thousand-dollar account-based balance and was puzzled that the balance still fell despite what he considered a decent return. At three point eight five percent, annual interest was about fifteen thousand four hundred, leaving roughly ten and a half thousand of principal consumed each year, and accelerating as the balance shrank. Seeing the tail risk, he shifted part of the balance to growth assets for the long term and kept a five-year cash bucket for the drawdown, smoothing both problems at once.
Glossary of Terms
- Drawdown
- The phase of retirement or spending in which you withdraw regular income from an accumulated balance rather than contributing to it. The withdrawal rate versus the interest rate determines whether the balance survives.
- Depletion Date
- The point at which a balance under drawdown reaches zero. Knowing it precisely, rather than guessing, is the core purpose of a distribution calculation.
- Sustainable Withdrawal
- A withdrawal level at or below the interest the balance generates, meaning the principal is never consumed and the income stream can continue indefinitely.
Frequently Asked Questions
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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 Australian tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.