Why a Profitable Business Can Run Out of Cash
Profit and available cash answer different questions. A business can record a successful month while still needing money for bills before customers pay. Understanding that gap is more useful than treating a positive profit figure as permission to spend.
By USCalcly · Updated
Follow one sale through two different timelines
Consider a simplified service business that invoices 12,000 during a month and records 8,000 of related expenses. Ignoring other accounting items, that suggests 4,000 of profit. Suppose customers pay only 3,000 before month-end while the business pays the full 8,000. Cash movement is 3,000 − 8,000 = −5,000.
Starting cash of 10,000 becomes 5,000, even though the month’s simplified profit is positive. The remaining invoices may be valuable, but they cannot pay a bill until collected or otherwise financed. This is a hypothetical timing example, not a description of any particular business.
Separate receipts, commitments and accounting entries
The Australian Government’s cash-flow guidance focuses on money entering and leaving the business and on forecasting future flows. That perspective helps separate a sales target, an issued invoice and an actual receipt. They should not all be treated as money in the bank.
Some outflows also differ from the expenses appearing in a simple profit view. Buying equipment may use cash immediately while accounting spreads its cost over time. A loan principal payment uses cash without being the same as interest expense. Inventory paid for ahead of sales can tie up money before the related revenue arrives. Ask your accountant about the treatment that applies to your records.
Replace a smooth average with a payment calendar
Write down expected receipt dates and the dates payments must leave. Carry the closing balance forward after each interval. The example below begins with 5,000 and uses four weekly movements.
| Week | Opening cash | Receipts | Payments | Closing cash |
|---|---|---|---|---|
| 1 | 5,000 | 1,000 | 4,000 | 2,000 |
| 2 | 2,000 | 1,000 | 3,500 | −500 |
| 3 | −500 | 5,000 | 1,500 | 3,000 |
| 4 | 3,000 | 3,000 | 2,000 | 4,000 |
Look for the first shortfall, not only the final balance
The example ends with 4,000, but week two has a 500 shortfall. A positive month-end total would hide that problem. The negative number is a signal to revise the plan; it does not assume an overdraft is available. A reserve can flag pressure earlier than zero.
Check receipt dates against customer commitments and past collection patterns. Check payment dates against payroll, supplier terms and other obligations. Keep uncertain receipts visibly separate. Do not solve a forecast by assuming suppliers will accept late payment or that new borrowing is already approved.
Use runway as a summary, then inspect the details
The Cash Runway Calculator is useful when a steady monthly net burn is a reasonable summary. It shows how long cash above a chosen reserve would last. It cannot reveal the week-two problem because it deliberately smooths flows through the month.
Use both views: a runway estimate to communicate the overall buffer, and a dated forecast to decide when cash is needed. Revisit the forecast when a large invoice moves, a contract changes or a one-time payment is added. Possible responses include confirming collection dates, changing the timing of optional spending or discussing terms early. The right action depends on real agreements and constraints, not on a calculator alone.
Common questions
Can a cash-positive business still lose money?
Yes. Borrowing or collecting old invoices can increase cash while current operations lose money. Read cash movement and profitability together.
Should I count a promised investment?
Keep it separate until its availability and timing are sufficiently certain for the scenario. An optimistic funding assumption can conceal the need for a contingency.
Sources
For informational purposes only. This guide does not provide financial, tax, legal, or investment advice.