Cash flow is the money that moves into and out of a business over a period of time. Cash coming in (from customers, loans or asset sales) is inflow. Cash going out (to suppliers, staff, rent, lenders and equipment) is outflow. The difference between the two is your net cash flow. When more cash comes in than goes out, cash flow is positive. When more goes out, it is negative. Cash flow tells you whether the business can pay its bills this month, which profit alone does not.
The US Chamber of Commerce puts it the same way: cash flow is “the amount of money coming into (inflow) and going out of (outflow) your business”. This guide covers what cash flow means in practice, its three types, how it differs from profit, what free cash flow is, a worked example, and how a small business can track it week to week. If you want the report that records all of this, our guide to the cash flow statement walks through it line by line.
Cash flow meaning in plain terms
Think of the business bank account. Cash flow is the story of how its balance changed and why. A shop that sells $50,000 of goods in March but collects only $30,000 of it by March 31 had $30,000 of cash inflow from sales that month, not $50,000. The other $20,000 is still owed by customers, and it cannot pay a supplier until it arrives.
Three things make cash flow different from other money measures:
- It is about timing. Cash counts when it actually changes hands, not when a sale is booked or a bill is issued.
- It covers every source. A bank loan is cash in. Buying a delivery van is cash out. Neither is revenue or an operating expense, but both move the balance.
- It is measured over a period. A week, a month, a quarter or a year. The same business can have positive cash flow in December and negative cash flow in February.
The three types of cash flow
Accountants split cash flow into three groups, based on what caused the money to move. The same three groups appear as the three sections of a cash flow statement.
| Type | What it covers | Typical inflows | Typical outflows |
|---|---|---|---|
| Operating cash flow | Day-to-day running of the business | Customer payments | Suppliers, payroll, rent, utilities, taxes, interest |
| Investing cash flow | Buying and selling long-term assets | Sale of equipment or property | Equipment, software builds, a new location |
| Financing cash flow | Money from and to lenders and owners | Loans, credit lines, owner investment | Loan principal repayments, owner draws, dividends |
Operating cash flow
This is the cash the core business generates. For an online store, it is the money collected from orders minus the money paid for inventory, shipping, staff, software and ads. Operating cash flow is the number that says whether the business model pays for itself. A company can survive negative investing or financing cash flow for years. It cannot survive negative operating cash flow forever without new money coming in.
Investing cash flow
This covers long-term assets. When a brand buys warehouse racking or a new packing machine, investing cash flow is negative. When it sells an old vehicle, investing cash flow is positive. Negative investing cash flow is often a healthy sign, because it means the business is putting money into things that should earn more later.
Financing cash flow
This covers money raised from and returned to lenders and owners. Chase describes it as business loans and outside funding, including money received from loans or lines of credit, and debt repayment. A new line of credit is positive financing cash flow. Paying it down is negative.
Positive vs negative cash flow
Positive cash flow means more cash came in than went out during the period. It gives the business room to pay down debt, build a reserve or invest.
Negative cash flow means more cash went out than came in. It is not automatically a problem. As Chase notes, negative cash flow is common for startups, which spend ahead of revenue. It is also normal for a seasonal business that buys inventory in the months before its peak. What matters is the cause:
- Negative because you are investing (new equipment, a planned inventory build before a holiday season): usually fine, as long as there is cash or credit to cover it.
- Negative because customers pay late: a collections problem. The sales exist, the cash does not.
- Negative because costs exceed what the business earns: a business model problem, and the one to act on first.
The US Chamber’s guidance on recovering from negative cash flow lists the usual levers: a loan, faster collections from customers, or agreeing later payment terms with suppliers.
Cash flow vs profit
Profit is revenue minus expenses, recorded when they are earned or incurred. Cash flow is money that actually moved. The two diverge all the time, and a profitable business can still run out of cash.
The common reasons they differ:
- Customers pay on credit. The sale counts toward profit on the invoice date. The cash arrives 30 or 60 days later.
- Inventory is bought before it is sold. Cash leaves when you pay the supplier. The cost only hits profit when the goods sell.
- Loans and equipment. Borrowing brings in cash but is not income. Buying equipment spends cash but is expensed gradually through depreciation.
- Depreciation itself. It reduces profit but no cash leaves the business.
This is why the method of bookkeeping matters. Cash-basis books record income and expenses when money moves, which makes cash flow easy to see. Accrual books record them when earned or incurred, which gives a truer picture of profit. Our guide to cash vs accrual accounting covers which suits which business.
What free cash flow is
Free cash flow is the cash left after the business pays to run itself and to maintain or buy its long-term assets. Bank of America defines it as “the money that is left over after a business pays its operating expenses (OpEx) and capital expenditures (CapEx).” The usual shorthand is:
Free cash flow = operating cash flow minus capital expenditures
So a business with $500,000 of operating cash flow that spends $200,000 on equipment has $300,000 of free cash flow. That is the money it can use to pay down debt, pay owners, or reinvest without borrowing. Lenders and buyers look at free cash flow because it shows what the business produces after keeping itself running.
A worked example: one month at a small online store
Here is an illustrative month for a small direct-to-consumer brand. The numbers are made up to show the mechanics.
In April the store books $80,000 of sales. Most orders are paid by card and settle within days, but $12,000 is owed by a wholesale customer on 30-day terms. It also takes a $25,000 equipment loan and buys a $30,000 packing machine.
| Line | Amount |
|---|---|
| Cash collected from customers | $68,000 |
| Paid to suppliers for inventory | ($34,000) |
| Payroll | ($15,000) |
| Rent, software and shipping | ($9,000) |
| Operating cash flow | $10,000 |
| Packing machine purchased | ($30,000) |
| Investing cash flow | ($30,000) |
| Equipment loan received | $25,000 |
| Loan repayment on an older loan | ($2,000) |
| Financing cash flow | $23,000 |
| Net cash flow for April | $3,000 |
What the example shows:
- The store booked $80,000 of sales, but $12,000 of it is not cash yet.
- Operating cash flow is positive at $10,000, so the core business is paying its way.
- Free cash flow is $10,000 minus $30,000, or negative $20,000. The loan covered the gap.
- Net cash flow is a modest $3,000. Without the loan, the bank balance would have dropped by $22,000 in one month.
That last point is why owners watch cash flow as closely as profit. The machine may pay for itself within a year, but the cash left the account in April.
How a small business tracks cash flow
Tracking cash flow does not need a finance team. It needs clean books and a routine.
- Keep the books current. Every sale, bill, payout and transfer categorized each week, and every bank and card account reconciled each month. Cash flow reporting is only as good as the bookkeeping underneath it.
- Look at the three types separately. A healthy bank balance built on a new loan is different from one built on operating cash.
- Watch receivables. Know who owes you, how much and how late. An AR aging report shows it in one view.
- Forecast forward. A rolling 13-week cash forecast, updated weekly, shows a shortfall before it arrives. The US Chamber notes that keeping the statement current lets you project cash flow and budget for it.
- Plan for seasons. If you buy stock three months before peak, plan the cash for it three months before that.
- Review monthly. Compare actual cash flow to the forecast and ask why it differed.
Most small businesses fall behind on step one, and everything after it depends on it. That is the part Atidiv takes on. Our bookkeeping services for small businesses keep transactions categorized and accounts reconciled, and produce the monthly reports, including the cash flow statement, that owners use to make these decisions. For businesses that need more than the books, our finance and accounting team also covers financial reporting.
Frequently asked questions
What is cash flow in simple words?
Cash flow is the money coming into a business minus the money going out over a period. If more comes in than goes out, cash flow is positive. If more goes out, it is negative.
What is the difference between cash flow and a cash flow statement?
Cash flow is the movement of money itself. A cash flow statement is the financial report that records it, split into operating, investing and financing activities. Our cash flow statement guide explains how to read one.
Is negative cash flow always bad?
No. It can mean the business is investing in equipment or building inventory ahead of a busy season. It is a warning sign when operating cash flow stays negative, because that means the core business is not generating the cash it spends.
How is free cash flow calculated?
Free cash flow equals operating cash flow minus capital expenditures. It is the cash left after running the business and paying for long-term assets.
Can a profitable business have cash flow problems?
Yes. Profit counts sales when they are made and costs when they are incurred. If customers pay late, or cash goes into inventory or equipment, a profitable business can still be short of cash to pay its bills.
How often should a small business review cash flow?
Weekly for the bank balance and receivables, and monthly for a full cash flow statement against forecast. Seasonal businesses should look further ahead before their peak.
Maximilian Straub is the Chief Operating Officer for Guild Capital and oversees all areas of the company's strategic operations and portfolio performance across the world. He is also a board member for Atidiv, supporting its growth initiatives. He served as the Chief Operating Officer and Chief Financial Officer for Spring Place and had previously spent 7 years advising clients in strategy, operational execution and organizational transformation while at McKinsey & Company.