The market doesn't know your retirement date. If it drops hard in your first year or two of drawing on your savings, the damage can outlast the drop itself, because money you sell at a loss early never gets the chance to recover.
Financial planners call this sequence of returns risk, and it's one of the few retirement risks you can largely plan around before it happens. The fix isn't complicated: keep a few years of spending somewhere the market can't touch it.
Decision
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Pick the option closest to your situation.
What a Down Market Actually Costs You Early in Retirement
A portfolio that drops 20 percent the year before you retire is a paper loss if you don't sell anything. The same drop the year after you retire is different, because you're pulling money out on top of the decline, selling more shares to generate the same income while prices are down.
That mix, withdrawals plus a down market, is what can shrink a retirement account faster than the math on a good year ever suggested. A cash reserve exists to break that combination by giving you an income source that doesn't require selling anything while prices are low.
Calculator
Find your monthly gap
Enter your guaranteed income and essential spending. If the result is negative, that's roughly what your savings need to cover every month, the number a reserve is sized against.
Enter your numbers to see the total.
If you want to see how a full withdrawal plan holds up over decades, not just the next year or two, 4% Withdrawal Rule: Check Your Number walks through that separately.
Build the Reserve With Something Stable, Not Your Growth Investments
The reserve only works if it holds its value exactly when your other investments don't. That means short-term, high-quality instruments like Treasury bills or a high-yield savings account, not anything that chases a higher return by taking on more risk.
A common approach is to ladder short-term Treasury bills so a portion matures every few months, keeping the money liquid without giving up all the yield. Three to five years of the monthly gap you calculated above is a reasonable range to target, adjusted for how much flexibility you have elsewhere in your spending.
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Checklist
Set up the reserve
A few decisions now save a scramble later.
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Timeline
Put the rule in writing
Check off each step as you complete it.
Write the exact rule for when you'll draw from the reserve instead of your investments.
Draw your income from the reserve, not the investments that just dropped.
Rebuild the reserve back to its target size before the next downturn arrives.
Save your numbers and your rule so you're not deciding from scratch in a down year.
Decide Now When You'll Actually Use It
A reserve without a rule tends to sit untouched during the exact year it was built for, because selling from savings still feels safer than watching a number go down. Decide the trigger before you retire, while you can think it through calmly.
A simple rule works better than a complicated one. Many retirees use something close to this: draw from the reserve, not the portfolio, in any year the diversified investments are down from their last peak, and refill the reserve in the years they aren't.
If required withdrawals complicate the timing, Turning 73: What Your First Required Minimum Distribution Means for Your Taxes covers how those deadlines interact with a down year.
Common questions
What is sequence of returns risk?
It's the risk that a market drop early in retirement does more lasting damage than the same drop later, because you're withdrawing money on top of the decline instead of letting a paper loss recover on its own. A cash reserve exists to give you an income source during those years that doesn't require selling investments while prices are down.
How big should my cash reserve be?
Start with the monthly gap between your essential spending and your guaranteed income, then multiply it by 3 to 5 years of coverage. That range gives your investments time to recover from a downturn without you needing to sell them at a loss.
Should I use Treasury bills or a savings account for the reserve?
Either can work, since both are stable and don't lose value when the market drops. A short-term Treasury bill ladder, where a portion matures every few months, often pays more than a savings account while keeping the money liquid. Ask your bank or brokerage, or open a TreasuryDirect account directly, to compare the two for your numbers.
When should I actually draw from the reserve instead of my investments?
Decide this before you retire, not during a down year. A common rule is to draw from the reserve in any year your diversified investments are down from their last peak, then refill the reserve in the years they aren't.
