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Guide · Pricing & Margin

Revenue, Profit, and Cash Flow: Three Different Numbers

Separate sales, accounting profit, and cash movements with an invoice example, an inventory purchase, and a monthly reconciliation.

By PriceAndProfit Editorial Updated 3 min read

On this page
  1. Worked calculation
  2. Decision checks and limits
  3. Apply the calculation

A profitable sale can leave your bank balance lower at the end of the month. Revenue describes earned sales, profit subtracts the expenses attached to the reporting period, and cash flow records money moving in and out. These measures answer different questions. A price decision needs all three: whether customers buy, whether the business earns enough on those sales, and whether receipts arrive before payments are due.

Worked calculation

Operating profit = earned revenue − cost of goods sold − operating expenses; ending cash = starting cash + cash receipts − cash payments

Consider a studio that finishes and invoices a $12,000 order in October. For this simplified management example, the full amount is October revenue. Materials used on the order cost $4,000, and October operating expenses are $3,000, producing $5,000 of operating profit. The customer pays $2,000 in October and the remaining $10,000 in November. October revenue is still $12,000 under the example's earned-revenue assumption, despite only $2,000 arriving.

The studio pays all $4,000 of the materials bill and its $3,000 of operating expenses during October. Those transactions produce an October cash outflow of $5,000 net of the customer receipt. Starting cash of $8,000 therefore becomes $3,000. A separate $1,500 purchase of unused materials would lower ending cash again, to $1,500, without automatically becoming an expense on the completed order. Inventory timing changes the bridge between profit and cash.

Hypothetical worked example
October measureAmountMeaning
Revenue $12,000 Completed order
Operating profit $5,000 After $7,000 of expenses
Net cash flow −$5,000 Before unused-material purchase
Ending cash $3,000 From $8,000 opening cash

Decision checks and limits

Now suppose the studio offers the customer a $600 reduction for immediate payment. Revenue and operating profit each fall $600 if all other assumptions hold, while October receipts may arrive sooner. Calling that a $9,400 cash-flow improvement would describe timing, not an additional $9,400 of profit. Compare the discount's actual cost with the business's documented timing needs; the calculation itself cannot determine whether the arrangement is worthwhile.

Use a monthly reconciliation that starts with profit and identifies outstanding customer balances, unpaid supplier bills, inventory purchases, and noncash expenses. Do not assume every bank deposit is revenue or every withdrawal is an expense: customer advances, transfers, and asset purchases require separate treatment. This guide illustrates management arithmetic, not revenue-recognition rules for a particular contract. Keep the same period and cost definition on every line so a cash shortage does not get mislabeled as an unprofitable sale.

Apply the calculation

  1. Record the earned sale

    Label the work delivered and the reporting period. Keep the invoice total separate from the amount actually collected.

  2. Map the bank movements

    Enter expected dates for customer receipts and supplier payments. Include inventory and equipment purchases without calling them current-period operating costs.

  3. Reconcile the difference

    Explain each timing adjustment in dollars. Revisit the bridge when a customer pays late or an order uses previously purchased materials.

Method references: SEC: Beginners' Guide to Financial Statements. Accessed October 22, 2026. All dollar figures are hypothetical worked examples.

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