Cash is the least intellectually exciting asset and the one most likely to save an early-retirement plan from its owner. It does not promise return. It promises that a frightening month does not require an irreversible decision.
Define the job
A cash buffer is not “whatever is left in checking.” Decide what it covers: twelve months of essential expenses, a known home repair, the first year of ACA premiums, or the gap until another income source begins. Once the job is defined, the amount becomes calculable.
Use essential spending, not the full lifestyle budget. Travel can pause. Housing, food, insurance, and basic healthcare cannot. Subtract dependable cash flow. The remainder is the annual draw the buffer must carry.
One year versus two
One year limits inflation drag and is often enough for flexible households. Two years buys more psychological room and reduces the chance of selling equities during a long decline. More than two years can be sensible for a very short horizon or a known obligation, but “I feel safer” eventually becomes expensive.
There is also a valid zero-buffer position: hold the chosen asset allocation, sell periodically, and avoid market timing. It is mathematically clean. It is only behaviorally clean if you will actually sell after a 40% decline without freezing or rewriting the plan.
The refill rule
Write when the buffer will be replenished. Refill from dividends and interest? From equity sales after strong years? On a fixed annual date? Without a rule, the buffer becomes a market-timing device operated by fear.
Compare the result with the expenses that vanish when work ends and the site’s real FIRE number. Cash should purchase time and composure. If it purchases only the pleasant sight of a stable balance, you may be overpaying.
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