How do you learn business cash flow quickly and correctly without confusing money in the bank with business profit? Begin with a calendar and a simple question: when does money actually come in, and when must it go out? Cash flow is about the movement of money over a period. A business might report a sale today but receive payment next month, while rent and supplier bills may be due this week. This eduKateSG Business Quick Notes lesson helps beginners track the opening balance, receipts, payments and closing balance using an easy example.
- Start with available cash: record the opening balance at the beginning of a period.
- List cash coming in: note money actually received, not merely invoices sent.
- List cash going out: note payments and their due dates.
- Calculate the closing balance: opening cash + cash receipts − cash payments.
- Check the timing: an affordable total can still fail when a bill is due too early.
- Practise a short forecast: test what happens if a customer pays late or a cost arrives sooner.
Teaching step 1 — draw a simple cash movement line. Imagine a small stall begins the week with S$200 in available business cash. During the week it receives S$300 from customers and pays S$150 for supplies and S$100 for a stall fee. Its closing balance, assuming no other transactions, is S$200 + S$300 − S$150 − S$100 = S$250. The movement during the week is positive S$50, but the closing cash balance is S$250 because the business already had S$200 at the start. Always distinguish the change in cash from the amount of cash on hand.
Teaching step 2 — learn why a sale may not be a cash receipt. A customer orders S$500 of services on terms that allow them to pay next month. The business may have completed the work this month, but no cash from that invoice has arrived yet. Under accrual accounting, revenue recognition depends on the applicable rules and when the work has been performed; cash receipts are recorded when money arrives. These are related but different views. If the business needs S$300 for wages this week, a S$500 unpaid invoice cannot be spent as though it were already in the bank.
Teaching step 3 — test a late-payment scenario. Suppose the owner starts Monday with S$250, expects S$400 from a customer on Tuesday and must pay a S$300 supplier bill on Wednesday. If the customer pays on time, the Wednesday balance after the bill is S$250 + S$400 − S$300 = S$350. But if the customer pays on Friday, the Wednesday balance would be S$250 − S$300 = minus S$50, assuming no overdraft or other available funds. This signals a funding gap: the business cannot simply make a negative payment from money it does not have. It may need an agreed payment arrangement, more available cash or another lawful funding option before Wednesday.
The four-line business cash flow note
- Opening cash: money available at the beginning of the period.
- Receipts: money that actually comes into the business during the period.
- Payments: money that actually leaves the business during the period.
- Closing cash: opening cash + receipts − payments, after any other cash movements.
Make the period explicit: today, this week or this month. A cash balance from Monday cannot be compared directly with an annual profit figure without understanding the timing and purpose of the two reports.
Profit, revenue, bank balance and cash flow
Revenue describes income from sales under the relevant recognition rules. Profit is revenue less relevant expenses for an accounting period. A bank balance is an amount held in an account at a particular point, subject to restrictions, uncleared items and other adjustments. Cash flow tracks the movement of cash over a period. None of these numbers is automatically a substitute for the others.
For example, a business might pay cash to purchase inventory today but sell that inventory next week. Its cash falls today even though the inventory remains an asset; the purchase is not necessarily the same as an expense recognised immediately. Likewise, borrowing cash raises the bank balance but also creates a liability. Learning these differences is a good foundation for accounting.
A cash calendar prevents timing surprises
- Write starting cash: check what money is genuinely available for payments.
- Record confirmed receipts: include the expected payment date and mark any uncertainty.
- Record planned payments: put their actual due dates on the calendar.
- Calculate daily or weekly balances: look for the earliest shortfall.
- Plan a response: update the forecast if a payment or cost changes.
Forecasts are not promises. A customer may pay late, a supplier may require a deposit, or expenses may be higher than expected. Label confirmed dates and tentative dates separately. Do not use an optimistic forecast to hide an actual shortage.
Simple working capital: cash can be tied up
A shop may need to buy stock before customers pay. Money tied up in stock cannot also be used to pay a bill unless the business has other funding. Some suppliers offer credit terms, which may postpone the cash payment, but the obligation remains. Other businesses receive deposits or advance payments, which bring cash in early but create responsibilities to deliver the promised goods or services.
Ask which steps make cash move first: order stock, take payment, deliver the order or pay the supplier? Drawing those events on a timeline makes working capital easier to understand than starting with a complicated financial ratio.
A ten-minute cash flow routine
- Minutes 1–2: write a hypothetical opening cash balance for one week.
- Minutes 3–4: list money expected to arrive, with dates.
- Minutes 5–6: list payments and their due dates.
- Minutes 7–8: calculate the cash balance after each event.
- Minute 9: move one receipt three days later and check for a shortfall.
- Minute 10: explain which number changed and what action might be needed.
Quick practice: a five-day cash forecast
A business starts Monday with S$600. It pays S$240 for supplies on Tuesday, receives S$300 from a customer on Wednesday and pays S$180 in rent on Friday. Assuming these are the only cash movements, what is the balance at the end of the week? What is the lowest balance during the week?
Answer: Monday S$600. Tuesday after supplies: S$360. Wednesday after the receipt: S$660. Friday after rent: S$480. Closing cash = S$480. The lowest recorded balance after these events is S$360. Checking only the weekly total would not show when that low point occurred.
Cash flow mistakes to correct
- Counting an unpaid invoice as received cash: record it as a forecast receipt until it arrives.
- Calling a loan cash receipt ‘profit’: borrowing raises cash and creates an obligation.
- Ignoring due dates: place receipts and payments in chronological order.
- Mixing personal and business money: label transfers properly and keep suitable records.
- Omitting tax, wages or irregular bills: include obligations that matter for the forecast.
- Assuming a positive closing balance means no cash shortage: check intermediate dates.
Check your understanding
1. Starting cash is S$100, receipts are S$80 and payments are S$120. What is closing cash? S$60. 2. Is S$500 owed by a customer the same as S$500 already received? No. 3. What should you examine if next Friday’s bills exceed Thursday’s available cash? The payment dates, available funds and lawful options to address the gap.
Continue the Business Quick Notes learning path
Begin with Business Fundamentals. Connect the numbers to Business Sales, understand prices in Business Pricing, read the records in Business Accounting, and prepare contingencies with Business Risk Management. For a wider plan, continue to Business Planning.
The U.S. Small Business Administration business finance resources provide a broader introduction to financial management and record keeping. This lesson uses hypothetical simplified transactions for education; real cash forecasts must reflect actual bank data, payment arrangements and legal obligations.
Remember: Cash flow is a dated story of money moving. Write the opening amount, follow each receipt and payment, and notice the first moment when cash may be insufficient.