- Most small businesses should keep 3 to 6 months of fixed expenses in reserve, plus the cost of their most likely big repair.
- The median US small business held only 27 days of cash in a JPMorgan Chase Institute study of about 597,000 firms; restaurants held 16.
- Score five risks (revenue concentration, seasonality, equipment age, debt, owner buffer) to decide where in the 3-to-6-month range you belong.
- Build it with a fixed percentage of every deposit, Profit First style, into a separate account you do not see every day.
- Park it in a high-yield savings account or short T-bills; both paid roughly 4% to 4.1% in late September 2026. Not financial advice.
How much cash reserve should a small business keep? For most small operators the answer is three to six months of fixed expenses, plus enough to cover the single most likely big repair. Stable, diversified businesses with little debt can sit near three months. Businesses with one big customer, seasonal swings or heavy loan payments should aim for six. That sounds conservative until you see how thin most businesses actually run.
Part of our complete guide: scale a vending machine business.
Nothing here is financial advice. It is the method we would use to size a reserve for a vending, ATM or other route business, and it works for most small service businesses too. Where to hold the money gets a short section below; we go deeper on that in where to keep business cash.
How thin most businesses really run
The JPMorgan Chase Institute studied the bank accounts of about 597,000 small businesses and measured cash buffer days: how long each could keep paying its bills if all revenue stopped. The median business had 27 days. A quarter of businesses had 13 days or fewer. The top quarter had 62 days or more. The median restaurant held only 16 days, while the median real estate business held 47.
The data is from 2015, and your business is not the median, but the pattern still rings true: most small businesses are one bad month away from a problem. A month where a big location closes, a compressor dies and a card processor holds funds at the same time is not rare. It is just unscheduled.
The common rules of thumb
| Rule | What it means | Where it comes from | Weakness |
|---|---|---|---|
| 3 months of expenses | Enough to survive a quarter of zero revenue | Profit First suggests building its Vault account to about 3 months of expenses | Ignores big one-off repairs |
| 3–6 months | The range most accountants quote | General small-business guidance | No way to pick a point in the range |
| 6+ months | For volatile or debt-heavy businesses | Conservative lending and advisory practice | Can leave cash idle that should be growing the business |
| Buffer days | Cash divided by daily outflows | JPMorgan Chase Institute research | A measurement, not a target |
The problem with every rule of thumb is that it treats all businesses as equally risky. A route with twenty machines across fifteen locations and no debt does not need the same cushion as a single laundromat with a big equipment loan. So score it.
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Start building free →Score your risk to pick your number
Give yourself 0, 1 or 2 points on each factor.
- Revenue concentration. 0 if no single customer or location is more than 15% of revenue. 1 if one is 15–30%. 2 if one is above 30%.
- Seasonality. 0 if monthly revenue varies less than 15%. 1 for noticeable seasonal dips, like a school or office location in summer. 2 if one season makes most of the year.
- Equipment age and cost. 0 if equipment is newer and cheap to fix. 1 for a mix. 2 if a single failure could cost more than a month of profit.
- Debt load. 0 for no business debt. 1 if loan payments are under 20% of monthly gross. 2 if above that.
- Owner buffer. 0 if you have a separate personal emergency fund and other income. 1 if the business is a major but not the only income. 2 if the household depends on it.
Then read off your target:
| Total score | Target reserve | Who this usually is |
|---|---|---|
| 0–2 | 3 months of fixed expenses + one big repair | Diversified route, little debt, owner has a job |
| 3–5 | 4–5 months + one big repair | Growing business with some financing and one or two big accounts |
| 6–10 | 6 months + one big repair | Concentrated, seasonal or leveraged; household relies on it |
Use fixed expenses, not total expenses. If revenue stops, many variable costs stop with it: you do not buy product for a machine that is not selling. What keeps going is loan payments, insurance, software and telemetry fees, storage or warehouse rent, phone, vehicle costs and any payroll you want to keep.
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A worked example
Here is an illustrative example, not a real operator. Terrence (illustrative) runs nine vending machines across seven locations. One hospital location brings in about a quarter of his revenue. He financed four machines, and he has a day job and a separate personal emergency fund.
- Fixed monthly costs: equipment loans $520, insurance $90, card-reader and telemetry fees $160, storage unit $110, phone and software $60, vehicle share $250. Total about $1,190.
- Risk score: concentration 1 (hospital near 25%), seasonality 0, equipment 1, debt 1, owner buffer 0. Total 3.
- Target: 4 months of fixed costs ($4,760) plus one big repair. A compressor or board replacement on a cold-drink machine can run about $1,000 or more, so he plans on $1,500.
- Reserve target: roughly $6,300.
If he adds a smart cooler on a larger loan next year, his debt score and his repair number both go up, and so does the target. The reserve is not a number you set once. Recalculate it every quarter or whenever you add debt or a big machine.
How to build it: the Profit First way
The fastest way to never build a reserve is to wait for a month with money left over. The Profit First system, from Mike Michalowicz’s book, flips that: every deposit is split by percentage into separate accounts before you pay bills. One of the accounts he recommends as a business stabilizes is the Vault, a no-touch reserve he suggests building to about three months of expenses. Our Profit First setup for vending operators covers the full account structure; the reserve piece works like this:
- Pick a percentage. Somewhere between 3% and 10% of gross deposits is common while you are filling it.
- Move it on a schedule. Twice a month, on the same days, whether it feels like a good month or not.
- Put it at a different bank. Out of sight is the point. If the reserve sits one tap away from the operating account, it becomes inventory money the first time a supplier runs a sale.
- Stop when it is full. Once you hit your target, redirect the percentage to profit, debt payoff or growth.
At Terrence’s volume, roughly $6,000 a month in gross sales, 7% of deposits is about $420 a month. His $6,300 target fills in about fifteen months, a little faster with interest.
Where to park the reserve
A reserve has two jobs: be there when needed, and not lose value. That rules out stocks and anything volatile. The two practical homes:
- High-yield savings. Top online savings accounts were paying up to about 4.2% APY in September 2026. Marcus by Goldman Sachs listed about 4.0% to 4.1% APY on its pages in late September 2026, with no fees and no minimum. Rates are variable. Marcus savings is a personal account, so if your business has its own EIN and bank relationship, check whether a business savings product fits better.
- Short Treasury bills. The 3-month bill yielded about 4.11% on September 22, 2026, and T-bill interest is exempt from state and local income tax. A brokerage such as Charles Schwab lets you buy new-issue bills and set them to roll automatically. Keep a few weeks of expenses in savings anyway, since a bill sold before maturity can come back slightly above or below what you paid.
On a $6,300 reserve, 4% is about $250 a year. Not life-changing, but it is money checking would not pay you, and it grows with the reserve.
When a reserve gets too big
Cash has a cost. A reserve earning 4% while a well-placed machine could return far more is money not working. Once you are comfortably above your target, the surplus has better jobs:
- Kill expensive debt first. A loan at 12% or a card balance beats any savings rate.
- Buy the next cash-flowing asset, but only for a location you have already secured.
- Pay yourself. Owner distributions are the point of the business.
- Move it to long-term investments you will not need for years.
That second step is where the reserve and growth connect. The reserve lets you say yes to a new placement without borrowing in a panic, and each new location adds cash flow that makes the next reserve easier to fill. If you are ready to line up the next one, VendBuddy finds properties and businesses in any ZIP code with the decision-makers’ contact details, and you can buy credits one pack at a time with no subscription.
If you are not sure where to start, most people pull a free list of the businesses near them in the before they do anything else. Five contact reveals are free and there is no card, so it costs you a search and about ten minutes.
A reserve is not exciting. It is the thing that lets you stay in business long enough for the exciting parts to happen. In a downturn, the operators still standing tend to be the ones who had cash, which is also why the businesses in our recession-proof ranking hold up best when the owner kept a cushion.
Frequently Asked Questions
How many months of expenses should a small business keep in savings?
Most small businesses should keep three to six months of fixed expenses, plus the cost of their most likely big repair. Diversified businesses with little debt and an owner who has other income can sit near three months. Businesses with a big customer, strong seasonality, heavy loan payments or a household that depends on them should aim for six.
What is the Profit First vault account?
In Mike Michalowicz's Profit First system, the Vault is a separate, hard-to-reach reserve account for true emergencies. He suggests building it to about three months of business expenses. It is funded by a fixed percentage of each deposit, moved on a schedule, rather than whatever happens to be left over.
How much cash does the average small business have on hand?
A JPMorgan Chase Institute study of about 597,000 small businesses found the median held 27 days of cash buffer, meaning it could pay its bills for 27 days with no revenue. A quarter held 13 days or fewer, and the median restaurant held just 16 days. The data is from 2015 but is still widely cited.
Should a business emergency fund be in a high-yield savings account or T-bills?
Either works. A high-yield savings account is simpler and instant; short Treasury bills paid a similar yield in late September 2026 (about 4.1% for the 3-month bill) and their interest is exempt from state income tax, which helps in high-tax states. Many owners keep a few weeks in savings and the rest in a short T-bill ladder. This is not financial advice.
Is a separate business reserve needed if I have a personal emergency fund?
Yes. The personal fund protects your household if you lose your job or get sick; the business reserve protects the business from a lost location, a big repair or a slow quarter. If they are the same pot, one emergency can empty both, and you end up choosing between your mortgage and your equipment loan.
General information, not legal, tax or financial advice. Rules change, so check the official source. Revenue and income figures are examples, not promises. See our terms.