How Much Cash Is Enough to Sleep at Night?

A fat bank balance can still leave you broke by Friday. Payroll, taxes, and three supplier payments have a way of clearing up the misunderstanding.

The useful question isn’t “How much money is in the account?” It’s “How long can this business keep its promises if cash stops arriving?”

Count the cash you can actually use

A cash reserve is money available to keep the business running when collections slow, equipment fails, or sales take a punch. It isn’t your sales tax money wearing a fake mustache.

Start with your bank balances. Subtract money held for taxes, customer deposits needed to fulfill jobs, and other restricted or committed funds that aren’t available for general operations. Don’t count an unused credit line as cash. That’s borrowing capacity, with conditions attached.

Illustrative example:

• Bank balances: $190,000.
• Taxes collected or already owed: $20,000.
• Customer deposits committed to upcoming job materials: $30,000.
• Available operating cash: $140,000.

That $140,000 covers operations and emergencies. It is not automatically available for an owner distribution.

Accounts receivable isn’t cash either. A customer owing you $45,000 is nice. Payroll prefers money.

Turn that balance into runway

Runway means how long your available cash lasts at a given spending rate.

For a conservative stress test, divide available cash by essential monthly cash outflows, assuming no new collections. Include the core payroll you intend to retain, employer payroll costs, rent, insurance, utilities, minimum debt payments, and other unavoidable bills.

Include the owner’s working salary if it must continue. Exclude optional distributions. Don’t pretend you’ll instantly eliminate every expense when sales drop.

Suppose essential monthly outflows are:

• Payroll and employer costs: $34,000.
• Rent, utilities, and insurance: $8,000.
• Debt payments: $5,000.
• Essential software, vehicles, and other bills: $3,000.

That’s $50,000 per month. With $140,000 available, you have 2.8 months of zero-collection runway.

This is not net profit. Loan principal consumes cash without being a profit-and-loss expense. Depreciation reduces accounting profit without sending money out today. Cash flow tracks when money actually moves.

Your gross margin and labor percentage affect how quickly cash disappears when revenue slips. Thin margins leave less room to absorb trouble.

Pick a target that fits your risks

Use these as planning targets, not commandments:

• Two to three months of essential outflows for a stable business with reliable collections and flexible costs.
• Four to six months when demand swings hard, customers pay slowly, a few accounts dominate sales, or fixed commitments are heavy.

These aren’t industry averages. They’re starting points for deciding how much protection you need.

At $50,000 per month, three months means $150,000. Six months means $300,000. That difference deserves a reason, not a shrug.

A repair shop paid at pickup has a different cash problem from a contractor waiting 60 days after invoicing. Both might report healthy profits. Only one is routinely financing its customers.

A usable credit line can provide backup. It shouldn’t be your entire emergency plan. Borrowing limits and terms can change, and repayments still need funding.

Give the slow season its own budget

January arriving is not an emergency. It does this every year.

Seasonality needs a forecast, not a bigger dose of optimism. Map monthly cash receipts and payments for the next year. Use collection dates, not invoice dates. Include annual insurance bills, tax payments, and planned equipment purchases.

Suppose your forecast shows cash shortfalls of $30,000, $35,000, and $25,000 across three consecutive slow months. That’s a $90,000 seasonal drawdown.

If you want at least $100,000 left for genuine emergencies at the bottom, you need $190,000 before the slowdown starts.

Don’t blindly add that $90,000 to every other buffer. Your ordinary runway target may already cover some of the same spending. Here, the seasonal plan raises your earlier $150,000 target to $190,000—not $240,000.

Test a worse version too: collections arrive a month late, or sales fall further. Watch the lowest projected balance. An annual total can hide a February disaster.

Build the reserve without strangling growth

Saving every spare dollar while neglecting productive equipment, pricing problems, or proven marketing can make the business weaker. Spending every spare dollar because “we’re growing” is bullshit too.

Build a reserve contribution into your cash plan, after operating bills, taxes, and necessary maintenance.

Say the business generates $20,000 a month after those obligations. You could assign:

• $5,000 to reserves.
• $8,000 to measured growth projects.
• $7,000 to additional reserves or owner distributions, depending on the forecast.

Moving from $140,000 to $190,000 takes ten months at $5,000 a month. If the slow season starts in four months, that plan fails. You need $12,500 monthly instead, earlier collections, or smaller discretionary outflows.

Keep growth spending specific. Know the cost per lead, average ticket, and cash contribution from additional jobs. Revenue that arrives after your cash runs out doesn’t rescue you.

Fix the cash target first

Monday morning, calculate available cash and essential monthly outflows. Set a minimum balance and a date for reaching it.

Then build a rolling 13-week cash forecast, updated weekly, alongside your seasonal plan. Put reserve money in a separate accessible savings account—not something volatile or locked away.

Set an automatic transfer the forecast can support. Pause optional distributions when cash falls below your floor.

Give the money a job before it quietly becomes spending money.