How to Calculate a Three-Bucket Retirement Income Strategy

What the Bucket Strategy Actually Does

The bucket strategy is a time-segmentation framework. It splits your retirement portfolio into three pools, each assigned a specific time horizon and matching asset type. You spend from Bucket 1. You refill Bucket 1 from Bucket 2. Bucket 3 grows without interruption.

The core problem it solves is sequence-of-returns risk. When you retire into a bear market and sell equities to fund living expenses, you lock in losses permanently. Those shares never recover in your portfolio. They are gone. The bucket strategy eliminates forced equity sales during downturns by keeping 2 to 3 years of cash and equivalents in Bucket 1 at all times.

This is not a theoretical benefit. Research from Morningstar and Vanguard consistently shows that portfolios subject to large early-retirement withdrawals during negative markets underperform equivalent portfolios by 10% to 18% over a 20-year horizon.

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The Three Buckets: Definition and Sizing

Bucket 1: The Spending Reserve (Years 1 to 2)

Bucket 1 holds liquid, stable assets. Think FDIC-insured high-yield savings accounts, money market funds, and short-term Treasury bills. The goal is zero principal risk and immediate accessibility.

What to hold: High-yield savings (currently 4.5% to 5.1% APY as of mid-2026), money market funds, 3-month to 6-month T-bills.

How to size it: Multiply your annual after-tax spending need by 2. If you need $72,000 per year, Bucket 1 holds $144,000.

Do not hold more than 3 years here. Cash drag is real. At a 4.8% average money market rate versus a 7.1% long-term equity return, every extra dollar you park in cash costs you 2.3 percentage points annually.

Bucket 2: The Income Bridge (Years 3 to 10)

Bucket 2 funds years 3 through 10 of retirement. It holds income-generating, lower-volatility assets. Bond ladders, dividend-paying equities, TIPS, and short-to-intermediate bond funds belong here.

What to hold: A 5-year Treasury ladder, investment-grade bond funds, dividend ETFs with yields above 3.0%.

How to size it: Multiply your annual spending need by 8. For the same $72,000 annual need, Bucket 2 holds $576,000.

The job of Bucket 2 is not to grow aggressively. Its job is to generate enough yield to refill Bucket 1 during market downturns without requiring you to sell Bucket 3 assets at depressed prices.

Bucket 3: The Growth Engine (Years 10 and Beyond)

Bucket 3 holds your long-term growth assets. Broad equity index funds, international diversification, REITs, and small allocations to alternatives live here. You do not touch this bucket for at least a decade.

What to hold: Total market index funds, international equity ETFs, REIT funds.

How to size it: Everything remaining after Buckets 1 and 2 are funded.

For a retiree with a $1.2 million portfolio and $72,000 annual needs: Bucket 3 holds $1,200,000 minus $144,000 minus $576,000, which equals $480,000, or 40% of total assets.

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Worked Example 1: The $1.2 Million Retiree

Scenario: Janet, age 65, has $1.2 million in retirement assets. She needs $72,000 per year after tax. Social Security provides $28,000, so her portfolio must fund $44,000 annually.

Revised bucket sizing at $44,000 annual portfolio draw:

• Bucket 1: $44,000 x 2 = $88,000
• Bucket 2: $44,000 x 8 = $352,000
• Bucket 3: $1,200,000 minus $88,000 minus $352,000 = $760,000

Bucket 3 now represents 63.3% of total assets. That is the appropriate equity weight for a 65-year-old with significant guaranteed income reducing portfolio dependency.

Bucket 2 at $352,000, invested in a 5-year Treasury ladder currently yielding approximately 4.4%, generates $15,488 per year in interest. That interest alone covers 35.2% of Janet's annual portfolio draw without selling a single bond or equity.

Over a 10-year bear market scenario where Bucket 3 returns 0%, Janet's portfolio survives intact. Bucket 1 covers years 1 and 2. Bucket 2 carries years 3 through 10. Bucket 3 has a full decade to recover before she touches it.

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Worked Example 2: The $2.5 Million Retiree

Scenario: David and Susan, both age 62, retire with $2.5 million combined. They need $110,000 per year from their portfolio. No Social Security for 5 more years.

Bucket sizing:

• Bucket 1: $110,000 x 2 = $220,000
• Bucket 2: $110,000 x 8 = $880,000
• Bucket 3: $2,500,000 minus $220,000 minus $880,000 = $1,400,000

Bucket 3 represents 56% of total assets. That equity exposure is reasonable given their 30-plus-year time horizon.

Now consider the cost of not bucketing. If David and Susan held a single 60/40 portfolio and the market dropped 30% in year one (as it did in 2022 and 2008), their portfolio would fall to $1,750,000. They would still need to sell $110,000 worth of assets, now at deeply depressed prices. Those sold shares represent 6.3% of the new portfolio value, permanently eliminated.

With buckets in place, they draw from $220,000 in cash and short-term instruments. Bucket 3 sits undisturbed at its depressed value of $980,000, waiting to recover. When markets rebound 40% two years later, Bucket 3 returns to $1,372,000, within 2% of original value. The unbucketed portfolio, having sold into the decline, does not recover proportionally.

The cumulative 10-year difference in this scenario exceeds $340,000.

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The Refill Mechanism: When and How to Replenish

The strategy only works if you execute the refill discipline. Here are the rules.

Refill Bucket 1 annually under normal conditions. Each year, transfer one year of spending from Bucket 2 income (dividends, bond maturities, interest) into Bucket 1. Do this in October or November before calendar-year distribution decisions.

Suspend refills during down markets. If Bucket 3 is down more than 15% from its peak, pause Bucket 2 to Bucket 1 transfers. Live on Bucket 1 reserves. Resume transfers only after Bucket 3 recovers to within 10% of its peak value.

Refill Bucket 2 from Bucket 3 in up years. When Bucket 3 has gained more than 12% in a calendar year, transfer one year of Bucket 2 spending back into Bucket 2. This resets your income bridge and extends its coverage horizon.

Set a minimum floor for Bucket 1. Never let Bucket 1 fall below 12 months of spending. If it reaches that floor and markets are still down, consider a temporary spending reduction of 10% to 15% rather than selling Bucket 3 assets.

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Common Sizing Mistakes

Undersizing Bucket 1. Some advisors recommend only one year of cash. That works in theory but fails psychologically. One bad quarterly statement causes panic selling. Two years of visible cash prevents that.

Oversizing Bucket 1. Holding 5 years of cash at 4.8% when Bucket 3 historically returns 7.1% costs 2.3 percentage points per year on excess cash. On $150,000 of unnecessary Bucket 1 assets, that costs $3,450 annually in foregone growth.

Ignoring inflation in Bucket 2. A bond ladder paying 4.4% looks adequate against a $44,000 annual draw today. At 3.2% inflation over 10 years, that same $44,000 need becomes $60,700. Size Bucket 2 based on inflation-adjusted spending, not today's dollar figures. Multiply your current annual draw by a 1.03 inflation factor per year to project forward.

Failing to rebalance Bucket 3. Bucket 3 is not a set-and-forget account. Rebalance annually to maintain your target equity allocation. An equity-heavy portfolio that ran from 65% to 80% equities without rebalancing faces far sharper losses in a correction.

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How to Run Your Own Numbers

The variables that drive bucket sizing are annual portfolio draw, time to Social Security or pension income, expected portfolio return by bucket, and inflation rate. Small changes in these inputs produce large differences in final allocation.

A retiree who underestimates inflation by 1 percentage point across a 25-year retirement will arrive at age 90 with 22% less purchasing power than projected. A retiree who oversizes Bucket 1 by $100,000 gives up approximately $57,000 in cumulative growth over 10 years at a 4% return differential.

These are not rounding errors. They are the difference between a comfortable retirement and one that requires spending cuts at age 80.

Use the CalcMoney Retirement Calculator to input your specific annual draw, Social Security income, expected return assumptions by bucket, and inflation rate. The calculator outputs exact dollar allocations for all three buckets and models your portfolio balance across a 30-year horizon under multiple return scenarios.

The math is not complicated. The discipline is. Build the structure now, before your first year of distributions forces you to make decisions under pressure.

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