How Much Cash Should My Business Have?

Short answer. Enough cash to cover three obligations at once: Working Capital Required for the operating cycle, current debt service, and a reserve sized to the volatility of your business. Expressed as days of working capital, most stable SMBs need 30 to 60 days. Volatile or seasonal businesses need 60 to 120. A dollar amount without a days-of-working-capital reading is a number without context, and the 3-to-6-months-of-expenses rule of thumb ignores the two biggest cash consumers on your balance sheet.

Why the Common Answer Is Wrong

Every owner has been told to hold 3 to 6 months of operating expenses in cash. It sounds prudent. It is not defensible for a business that is growing, carries debt, or collects on terms longer than 15 days. That rule of thumb was built for a static business with no debt and immediate collections, which describes almost no SMB in the trades or professional services.

Two structural cash consumers make the rule of thumb wrong. First, the Working Capital Gap scales with revenue. A growing business needs more cash than an idle one, not less, because the operating cycle expands with every additional dollar of sales. Second, debt service does not show up as an operating expense on the P&L. Principal payments consume cash while the income statement stays silent. A business with $12,000 a month in debt service needs roughly $15,600 in profit to cover it after taxes, none of which is captured in a "3 to 6 months of expenses" reading.

The right answer is not a percentage of expenses. It is a stacked calculation that names each obligation directly.

The Three-Part Cash Target

1. Working Capital Required

The cash the operating cycle demands, top to bottom. Daily cash need multiplied by days to collect. If the business spends $10,000 a day to operate and customers pay in 45 days, Working Capital Required is $450,000. That is what the operating cycle consumes before a single dollar of profit shows up. Nothing about that number is optional. It is the price of running the business at all.

This is not a reserve. It is capital in motion, funding receivables, inventory, and payroll between when the work is committed and when the customer pays. It gets reset every day. It grows with revenue, whether the owner plans for it or not.

2. Current debt service

Truck loans, equipment loans, credit cards, lines of credit, SBA loans, and leases all carry principal payments that drain the bank account. A defensible cash target holds 60 to 90 days of debt service liquid, so the account can absorb a slow month without missing a payment. Because taxes must be paid on profit before principal comes out of it, budget roughly $1.30 in profit for every $1.00 of debt service. A $10,000 monthly debt load is a $13,000 requirement. A 90-day reserve on that is $39,000, not $30,000.

3. Volatility reserve

A layer of cash beyond required working capital and debt service, sized to the volatility of the business. A commercial contractor with 45-day collections and lumpy job timing needs more reserve than a repeatable services firm with 15-day billing. Rough guide: 30 to 60 additional days of daily cash need for stable businesses, 60 to 120 days for volatile or seasonal ones. This reserve is what turns a bad month into an inconvenience instead of a crisis.

A cash target without a days-of-working-capital reading is a number that fits nobody. A defensible target is built from your own operating cycle, your own debt, and your own volatility.

Days of Working Capital: The Leading Indicator

A dollar target drifts as the business grows. Days of working capital does not, because it re-anchors to daily cash need every time revenue changes. That makes it the leading indicator owners actually need. Watch the number month over month, and a dropping figure warns that the operating cycle is running ahead of the cash cycle, before the bank balance ever tells the story.

Owners who set a static dollar target and hit it feel safe. Two quarters later the business is 20 percent bigger, the operating cycle now demands a bigger Working Capital Required, and the "safe" target is quietly underfunded again. Days of working capital catches the shift before the shortfall bites.

Where the Cash Target Fits Inside the Doctrine

Cash on the balance sheet does not exist for its own sake. It exists to fund the five sub-layers of Minimum Mandatory Profit (MMP): debt service, working capital, retirement funding, owner's compensation, and exit strategy. When the cash target is underfunded, one of those five is silently being starved to fund the others. Usually it is retirement, equipment reserves, or the owner's own paycheck.

Inside the Return to Owner (RTO) diagnostic, the defensible cash target is quantified as part of a single input pass. It feeds the Layer Cake model, which resolves upward from the MMP foundation to a Breakeven Sales figure the business has to hit to fund the target while still clearing the other sub-layers. Then the Business Biomarker Index (BBI) scores whether the business can actually reach that sales number.

How to Set Your Own Cash Target

1. Calculate daily cash need. Annual operating spend, including debt service at $1.30 per $1.00, divided by 365.
2. Measure days to collect. Weighted average across the last 12 months.
3. Compute Working Capital Required. Daily cash need times days to collect.
4. Add current debt service reserve. 60 to 90 days of monthly debt service times 1.30 for the tax adjustment.
5. Add volatility reserve. 30 to 60 days of daily cash need for stable businesses, 60 to 120 for volatile or seasonal ones.
6. Express as days of working capital. Total target divided by daily cash need. That is the runway number you monitor month over month.

A napkin version tells you if you are close. A defensible version, quantified inside an RTO engagement with the other four MMP sub-layers, gives you a Breakeven Sales figure to hit while funding the target without borrowing from retirement or the exit.

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