How big should my cash buffer be in retirement?

How much cash should a retiree actually hold, and why does it matter so much more once the paychecks stop? Enough to live on for one to three years without touching your portfolio. The buffer isn’t there to earn a return. It’s there to buy you the one thing a falling market tries to take away: the freedom to not sell.

What the buffer is really for

A working person’s emergency fund covers a job loss or a broken furnace. A retiree’s cash buffer does something deeper. It’s the tool that lets you skip portfolio withdrawals in a down year and spend from safe money instead, so you’re never a forced seller at the bottom.

That’s the entire game against sequence-of-returns risk, the danger that early losses plus steady withdrawals do damage you can never earn back. The buffer is the off-switch for forced selling.

How to size it

Start from your withdrawal need, not a round number. Take the annual spending your portfolio actually has to cover, after Social Security and any pension, and hold one to three years of that in cash and short, safe bonds.

• One year if you have other flexible income or you can cut spending fast.
• Two to three years if the portfolio is doing most of the heavy lifting and you want to ride out a long downturn without selling a single share of stock.

The cost of the buffer is real and worth naming. Cash drags on long-run returns, so a buffer that’s too big quietly taxes your growth for decades. Too small and the whole defense collapses the first time the market drops 30%. The right size is the smallest one that lets you sleep through a bear market.

If your accounts are large

With $3M+ the buffer stops being a meaningful drag. Three years of spending might be a rounding error against the whole portfolio, so you can hold a deep cushion and barely feel it. That’s a genuine edge, and it slots cleanly into a bucket strategy as the near-term tier. It lets you treat market crashes as something that happens to other people’s spending, not yours.

The trap at this level is the opposite one. It’s tempting to let cash pile up far past three years because it feels safe, and then inflation eats it while your stocks do the real work without you. A buffer is a tool with a job. Size it to the job, refill it from gains in good years, and let the rest of the portfolio run.

Your buffer is permission, not insurance. It’s the standing order that says you will never sell into a panic. That order, more than any forecast, is what carries a retirement through.