How Much Cash Should You Keep? The Answer Most People Get Wrong
By Rodrigo Rincón
Mar 17, 2026Keeping the right amount of cash is one of the most overlooked decisions in personal finance. Too little and a single unexpected event — a job loss, a medical bill, a broken car — forces you to sell investments or take on debt at the worst moment. Too much and your money quietly loses value to inflation while sitting idle. The right answer depends on your situation, not a universal rule.
Most financial advice on this topic gives you a number: keep three months of expenses. Or six. Or twelve.
But Rodrigo Rincón raises a more useful point in Wealth and Family: cash gives you the greatest possible flexibility — the ability to convert it into any other asset or cover any need the moment you want to. And yet, that flexibility comes at a real cost. Keeping money available generates one of the poorest long-term returns that exist.
So the real question is not just "how much?" It is: how much flexibility do I actually need to protect the money I worked hard to earn — and what am I giving up to have it?
Why Most People Get This Wrong
There are two common mistakes, and they pull in opposite directions.
The first is keeping too little. This is more common than people think — not because they are reckless, but because they are optimistic. They invest aggressively, they pay down debt quickly, or put all their money to work. And then something unexpected happens. Without accessible savings, they are forced to sell investments — often at a loss — or take on high-interest debt to cover the gap. What looked like smart financial behavior becomes a trap.
Rodrigo identifies this directly in Wealth and Family as one of the real risks to a person's wealth: not having enough cash to respond to an emergency — either because it is invested in illiquid assets or because the time it takes for those investments to mature is longer than expected.
The second mistake is keeping too much. This one is less obvious but equally costly. Cash sitting in a checking account, or even most savings accounts, earns a return that rarely keeps up with inflation. Over years, the purchasing power of that idle money quietly erodes. Keeping a year's worth of expenses in cash when three months would be enough is not conservative — it is expensive. Even so, this may be appropriate depending on each person's circumstances and preferences.
What Cash Is Actually For
Before deciding how much to keep, it helps to understand what cash is actually doing in your financial picture.
Cash has two jobs. The first is protection — covering emergencies and unexpected expenses without disrupting the rest of your finances. The second is opportunity — having resources available to act when something worth acting on appears, whether that is a business opportunity, an investment, or simply a good deal on something you actually need.
As Rodrigo writes in Wealth and Family, cash and other easily liquidated assets are an important component of being prepared — not just for emergencies, but to take advantage of opportunities when they appear. The entrepreneur who has no accessible savings cannot act when a good opportunity arrives. The professional who invested everything in illiquid assets cannot respond when something unexpected hits.
What cash itself is not useful for is growth. Holding cash expecting it to build wealth is a slow way to lose ground. That is a job for your investments.
How to Think About the Right Amount for You
Rather than a fixed rule, think about your situation across four factors:
How stable is your income?
An employee with a fixed monthly salary can generally plan their cash needs better than a business owner or freelancer whose income varies significantly from one month to the next. Variable income means variable risk — and your cash reserves should reflect that. Even so, someone who depends on a salary is exposed to the risk of unemployment, and it's wise to maintain reserves that account for that possibility.
How many people depend on you financially?
A single professional with no dependents can operate with a smaller cushion than someone supporting a family. More dependents means more potential obligations — and more reason to keep a larger buffer.
How liquid are your other assets?
If you have investments that can be sold within a few days with minimal loss, your effective liquidity is higher than it appears. If your main assets are a business, real estate, or other things that take time to convert to cash, you need a larger emergency reserve to compensate.
How secure does your income feel right now?
This is one of the most difficult questions. If your job or business feels stable, a smaller buffer may be sufficient. If there is genuine uncertainty — an industry in transition, a business going through a difficult period — a larger cushion makes sense.
A Practical Starting Point
For most working professionals with reasonably stable income: at least 3 to 6 months of regular expenses in a savings account or something similarly accessible.
For business owners, freelancers, or anyone with variable income: 6 to 9 months.
For anyone going through a period of professional uncertainty — a career transition, a business restructuring, an economic downturn in your sector: lean toward the higher end, or even beyond it temporarily.
These are starting points, not rules. The right number for you is the one that lets you sleep at night without keeping so much idle that it significantly costs you in the long run.
The Question Nobody Asks
Rodrigo raises something in Wealth and Family that is worth sitting with: if for whatever reason you had to leave your home — or even your country — quickly, what assets could you convert to cash and take with you, and what would you have to leave behind? What would you have access to?
It is not a scenario most people expect to face. But the question is useful precisely because it is uncomfortable — it forces you to think honestly about the real liquidity of your wealth, not just the liquidity on paper. Cash passes that test. Most other assets do not.
Frequently Asked Questions
How much cash should I keep in my savings account?
A practical baseline for most people is at least 3 to 6 months of your regular expenses — rent or mortgage, food, utilities, insurance, and any fixed loan payments. This is your emergency fund: money you do not invest and do not touch unless something unexpected happens. If your income varies or you have dependents, lean toward 6 to 9 months.
Is it bad to keep too much cash?
Yes, in the long run. Cash in a savings account typically earns a return that does not keep up with inflation — which means its real purchasing power decreases over time. Keeping significantly more than you need as a buffer means your money is quietly losing value instead of working for you. The goal is not to minimize cash — it is to keep the right amount and put the rest to work.
Should my emergency fund be in a savings account or invested?
The whole point of your emergency fund is that you are able to handle an emergency or seize an opportunity, your fund needs to be accessible within a very short timeframe (hours or days, not weeks or months). A savings account — or something similarly liquid and stable — is the right place for it. Investments are for money you will not need for at least 3 to 5 years.
What counts as "liquid" when thinking about my cash reserves?
For practical purposes, liquid means: accessible within a day or two, with no significant penalty or loss for accessing it. A savings account is liquid. A fixed-term deposit with an early withdrawal penalty is less so. Stocks can be sold within days, but their value can drop significantly right when you need the money most. Your home, a business, or a private investment is illiquid — it cannot be converted to cash quickly without significant effort or potential loss.
How does Ona help me figure out the right cash level for my situation?
Ona helps you look at your full financial picture — your income stability, your obligations, your other assets, and your life circumstances — and think through what level of cash reserves actually makes sense for you. Not a generic rule, but a conversation about your specific situation. Try Ona free for 3 days at onawealthmentor.com.
Rodrigo Rincón is founder of FOA Family Office Advisors, author of Wealth and Family*, and co-creator of Ona Wealth Mentor. With 25+ years in finance and family office leadership, advising families and professionals on wealth strategy, he built Ona to make conflict-free financial thinking accessible to everyone. Connect with Rodrigo on LinkedIn.*
