One of the most common questions I get from clients approaching retirement is some version of: how much should I keep in cash?
It seems like a simple question. It is not. The answer depends on your income sources, your spending needs, your risk tolerance, and most importantly, how you think about the purpose of cash in a retirement portfolio.
The Two Failure Modes
There are two ways to get the cash question wrong, and both are costly.
Too much cash: Cash earns very little. Even in a high-rate environment, money market rates rarely keep pace with inflation over the long run. A retiree who keeps $500,000 in cash just to be safe is effectively paying an insurance premium in the form of lost returns. Over a 20-year retirement, the opportunity cost of excess cash can be enormous.
Too little cash: This is the more dangerous failure mode. If you do not have enough liquid reserves, you may be forced to sell investments at a loss during a market downturn to fund your living expenses. This is the mechanism behind sequence-of-returns risk, and it can permanently impair a retirement plan that was otherwise well-constructed.
The goal is to find the middle ground: enough cash and near-cash assets to weather a downturn without selling long-term investments at the wrong time, but not so much that you are sacrificing meaningful returns.
The Income Floor Framework
The right starting point is not how much cash do I need? It is how much of my spending is already covered by guaranteed income?
If you have Social Security, a pension, or annuity income that covers your essential expenses, your need for a large cash buffer is significantly reduced. Your investments are not your primary income source. They are a supplement. You can afford to let them ride through market volatility because you are not dependent on them for day-to-day living.
If you are heavily dependent on portfolio withdrawals to fund your lifestyle, you need a more substantial buffer. The portfolio is doing double duty: generating income and managing risk.
The One-to-Two Year Rule
A common rule of thumb is to keep one to two years of living expenses in cash or cash equivalents. This is a reasonable starting point, but it needs to be calibrated to your situation.
If you have a strong income floor (Social Security plus pension covers 80% or more of your spending), one year of discretionary expenses in cash is typically sufficient.
If you are more dependent on portfolio withdrawals (your income floor covers less than 60% of your spending), two to three years of total spending in cash and short-term bonds provides a more comfortable buffer.
The logic is straightforward: if the market drops 30% in year one of your retirement, you want to be able to fund your lifestyle for two to three years without touching your equity portfolio. By the time you need to draw from equities, the market has historically recovered.
Where to Keep the Cash
Not all cash is equal. Here is a simple tiered approach:
Tier 1 (0 to 6 months of expenses): High-yield savings account or money market fund. Fully liquid. Used for monthly spending and unexpected expenses.
Tier 2 (6 to 18 months of expenses): Short-term CDs, Treasury bills, or short-duration bond funds. Slightly less liquid but earning meaningfully more than a savings account.
Tier 3 (18 months to 3 years of expenses): Intermediate-term bonds or a bond ladder. This is the buffer that protects your equity portfolio during extended downturns.
Everything beyond Tier 3 should be invested for long-term growth. This is the money that does not need to be touched for five or more years, and it should be positioned accordingly.
The Bottom Line
There is no universal right answer to how much cash you should keep in retirement. The right number depends on your income sources, your spending needs, your risk tolerance, and your psychological relationship with uncertainty.
What I can tell you is that the question is worth answering carefully, before you retire, not after. The structure of your retirement income plan determines how much cash you actually need, and getting that structure right is one of the most valuable things a good retirement planner can do.
Book a complimentary retirement brainstorm session and let's figure out the right number for your situation.
Jason Rindskopf is the founder of Two Waters Wealth Management and creator of the SMART Retirement Blueprint®. He works with high-achieving professionals and couples in the Charlotte, NC area who are within 10 years of retirement or recently retired.