Bucket Strategy Calculator
Allocate savings across short, medium, and long-term buckets.
Split a portfolio into near-term cash, medium-term bonds, and long-term growth buckets based on target allocations across each band.
What this tool does
The bucket strategy divides a retirement portfolio into three separate pools based on time horizon: cash for immediate or near-term expenses, bonds for medium-term needs, and growth-oriented holdings for longer-term objectives. This calculator takes your total portfolio value, expected annual spending, and your chosen allocation percentages for cash and bonds, then calculates the monetary amount in each bucket and how many years of spending each bucket can cover. The result shows your portfolio's distribution across time horizons and illustrates the runway each segment provides. Cash and bond percentages are the primary drivers—higher allocations to near-term buckets extend your spending horizon for those periods but reduce capital available for longer-term growth. This calculation assumes a static portfolio and does not account for investment returns, inflation, portfolio rebalancing, or changes in spending patterns. It serves as an educational illustration of how bucketing mechanics work.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Bucket strategy is a drawdown approach that separates money by time horizon. Cash bucket covers 1-2 years of spending. Bond bucket covers 3-10 years. Growth bucket is everything else and funds the long term. The structure aims to avoid drawing from growth assets in a downturn when cash is available instead. A 500,000 portfolio with 40,000 annual spending, split 10/30/60, gives 1.25 years of cash, 3.75 years of bonds, and 7.5 years of growth assets by spending count — roughly 12 years of total cushion.
Quick example
With portfolio total of 500,000 and annual spending of 40,000 (plus cash bucket of 10% and bond bucket of 30%), the result is 12.5 years. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Portfolio Total, Annual Spending, Cash Bucket %, and Bond Bucket %. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
What's happening under the hood
Apply percentages to portfolio total to get each bucket. Divide each bucket by annual spending to show years-of-runway per bucket. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
How to use this beyond the first run
Re-run the calculation once a year. Life changes — pay rises, new expenses, interest-rate shifts — and the figure that looked right 12 months ago often isn't today. Annual recalibration keeps the plan honest.
What this doesn't capture
The calculation assumes a steady savings rate and a stable interest rate. Real saving journeys include emergencies, windfalls, and rate changes — especially in easy-access products. The figure is a direction of travel, not a guarantee.
Allocating £500,000 across cash, bonds, and growth buckets yields 12.5 years per bucket based on your £40,000 spending needs.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator divides a portfolio into three buckets based on user-specified percentages. The cash bucket equals the portfolio total multiplied by the cash percentage; the bond bucket equals the portfolio total multiplied by the bond percentage; the growth bucket comprises the remainder. Each bucket value is then divided by annual spending to compute how many years that bucket alone could sustain withdrawals at the current spending rate. The model assumes a static portfolio allocation, constant annual spending, and treats each bucket independently without considering reallocation, investment returns, or spending flexibility. It does not model inflation, fees, tax effects, or changes in spending patterns over time.
References
Frequently Asked Questions
Common split?
When do I rebalance?
Does this replace the 4% rule?
What about inflation?
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