How much cash should my business keep?
How much cash a business should keep is a calculation, not a feeling: an operating cushion measured in months of operating expenses, sized lower for predictable revenue and higher for seasonal or insurance-dependent revenue; a tax reserve set aside from profit as it is earned; and an opportunity reserve for a hire or a purchase. Cash above those three should be deployed or used to pay down debt.
Key points
- A business should hold three separate cash reserves: an operating cushion, a tax reserve, and an opportunity reserve, each sized for a different job.
- The operating cushion is measured in months of operating expenses, fewer for predictable recurring revenue and more for seasonal or reimbursement-dependent revenue.
- A tax reserve is funded from profit as it is earned so each quarterly estimated payment is already covered when it falls due.
- Cash above the three reserves is idle capital and belongs in reinvestment, retirement plan funding, or debt paydown rather than the operating account.
- Where surplus cash should be invested is a question for a licensed investment adviser, not a matter of tax planning.
How many months of expenses should a business keep as an operating cushion?
Most owners hold either too little cash and lurch from one tight month to the next, or too much and let money sit idle out of anxiety. Neither is a decision; both are the absence of one. The amount of cash a business should keep is a calculation, and it breaks into three reserves that serve three different jobs.
The first is the operating cushion, measured in months of operating expenses rather than a round figure. Total what it costs to run the business in a typical month, meaning payroll, rent, insurance, loan payments, and recurring bills, and decide how many months of that you want on hand if revenue paused. A business with predictable, recurring revenue can hold fewer months safely because the inflow is dependable. A seasonal business, or one that waits on insurance or third-party reimbursement, needs more, because there are stretches when money goes out and little comes in. Medical and dental practices that depend on payer remittance sit at the higher end for exactly this reason.
Why does a business need a separate tax reserve and an opportunity reserve?
The tax reserve is the one owners most often skip until it hurts. As profit is earned through the year, a portion belongs to the estimated taxes that will come due on Form 1040-ES or the corporate equivalent, and setting that portion aside as it is earned turns each quarterly payment into a non-event. Left in the operating account, the same money feels like available cash, gets spent, and the estimate becomes a crisis. This reserve is not yours to deploy; it is already spoken for.
The third reserve is for opportunity. Beyond survival and taxes, a healthy business keeps some cash ready to move on the things that grow it: a key hire, a piece of equipment, a chance to buy inventory or a competitor's book of business on good terms. This reserve is what lets an owner say yes when an opportunity appears instead of watching it pass because every dollar was committed.
What should happen to cash above the three reserves?
Once the three reserves are funded, cash above them is no longer a cushion; it is idle capital, and idle capital quietly loses ground to inflation while earning little. The disciplined move is to put it to work: reinvesting in the business, funding a retirement plan that also carries a deduction, or paying down debt, which is often the most certain return available because it removes an interest cost the business is already carrying.
Treating this as a calculation converts a vague worry into three concrete targets you can fund and monitor. Set the targets with your advisor, review them as revenue and expenses change, and let the numbers rather than nerves decide how much cash the business holds.
What are the limits of this cash calculation?
The three-reserve method tells you how much to hold and why. It does not tell you where cash beyond the reserves should be invested. Choosing the account, instrument, or holding for surplus cash, and the balance between return and liquidity, is investment advice, and it belongs to a licensed investment adviser who can see your full financial picture. A CPA can size the reserves and confirm the tax effect of retirement funding or debt paydown, but should not name products or expected yields.
The targets are also not permanent. A new payroll commitment, a lease, a change in payer mix, or a jump in profit changes both the operating cushion and the tax reserve, so the calculation is revisited at least annually and whenever the business changes shape. A number set once and never reviewed drifts back into guesswork.
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Sources
Related guides: cfo, healthcare
Mena Hemaia, CPA, CIA
Chief Executive Officer, Accountack — West Palm Beach, Florida
If you want to know which of these apply to your business specifically, that is a conversation about your actual numbers — not a seminar example.
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