What Is Revenue? The Formula, When It Counts as Earned and Why It Isn't Cash

That's how CFI (the Corporate Finance Institute) defines it, and the next line of its definition is the one that matters most for a small business: expenses are deducted from revenue to arrive at profit, or net income. So revenue is what you sold. It isn't what you kept, and as you'll see below, it isn't always what you've been paid either. If you want the profit side of the story, I've covered gross profit vs net profit separately.

The revenue formula for products, services and contracts

CFI gives three versions of the formula, depending on what you sell. The maths is the same in whatever currency you trade.

Business type	Revenue formula (CFI)
Product business	Number of units sold x average price
Service business	Number of customers x average price of your services
Contract business	The value of contract 1 + contract 2 + contract 3, and so on

CFI notes that finance teams often forecast revenue right down to the individual product or customer. For a small business that's a useful habit. A single total tells you very little, but revenue split by product or by client shows you where the sales are coming from.

When revenue counts: the recognition principle

Revenue is recorded when you've done what you promised. CFI calls this satisfying your performance obligation, and in practice it means the moment the customer obtains control of what they bought. For a product, that's when the item is delivered. For a service, it's when the promised work is completed, or as the service is performed, depending on the terms of the contract.

The catch: revenue isn't the cash in your bank

Here's the part people don't expect. CFI points out that the recognition principle says nothing about getting paid. A card payment lands almost immediately, but a business client you've invoiced might not pay for several weeks. The revenue still belongs to the period you delivered in.

This is how CFI says it plays out when you deliver now and let the customer pay later:

1. You deliver the product or finish the work.
2. You record the full sale as revenue straight away.
3. The unpaid amount goes on your balance sheet as accounts receivable.
4. When the customer pays, you record no extra revenue. Your cash goes up and your receivables go down by the same amount.

So a month can show strong revenue and an empty bank account at the same time. That's not an error in your books. It's the gap between earning and collecting, and it's why I'd never judge a business on revenue alone.

Gross revenue vs net revenue

CFI's page on operating income describes sales revenue, or net sales, as the amount from selling goods and services excluding merchandise that's returned and any allowances or discounts given to customers. It counts whether the sale was made for cash or on credit. Read the other way round, gross is the figure before returns, allowances and discounts come off, and net is what's left after them. Don't confuse this with gross and net income, which are profit measures. I've explained the difference between gross and net income in another guide.

A real income statement: CFI's NVIDIA example

CFI walks through NVIDIA's 2024 income statement to show where revenue sits. These are CFI's figures for a large public company, in US dollars, as of October 2026:

Line on the income statement	NVIDIA, 2024 (CFI's example)
Total revenue (the top line)	$60.9 billion
Operating income, after operating expenses (also called EBIT)	$33.0 billion
Net income, after interest and taxes (the bottom line)	$30.0 billion

Notice the order. Revenue comes first, then operating expenses come off to give operating income, then interest and taxes come off to give net income. Your own income statement follows the same shape, just with smaller numbers.

Where revenue comes from in different sectors

Revenue doesn't only mean sales of products. CFI lists different sources depending on the kind of organisation:

Sector	Typical sources of revenue (CFI)
Businesses (corporate finance)	Sale of goods, sales of services, dividends and interest
Non-profits	Membership dues, fundraising and product or service sales
Personal finance	Salaries, bonuses, wages, dividends, interest and rental income
Public finance	Income tax, corporate tax, sales tax, duties and tariffs

Why revenue matters, and what happens when there isn't enough

CFI says revenue shows a business's financial health and growth potential, helps you judge how well operations are working, and tells you about profitability once you pair it with your costs. It also drives decisions about expansion and investment, and it's what investors and lenders look at to see your earning power.

When revenue falls short of what you need to pay staff, buy stock, pay suppliers and invest, CFI says the business has to draw on an existing cash balance. That cash comes from financing: borrowing (debt) or raising funds by selling a share of the business (equity). That's why forecasting matters. CFI lists the inputs a revenue model can include: website traffic, conversion rates, product prices, the volume of different products, discounts, and returns and refunds. Those forecasts then guide hiring, production scheduling and capital investment.

How to work out your revenue for a period

1. Decide whether you sell products, services or contracts.
2. Count the units, customers or contracts for the period.
3. Multiply by the average price, or add up the contract values.
4. Record it when you deliver, not when you're paid.
5. Track anything still unpaid as accounts receivable.

My verdict

Revenue is what you sold. It isn't what you banked, and it isn't what you kept. You need all three numbers, because each one tells you something different. Watch revenue to see if the business is growing, watch your receivables so you know who still owes you, and watch your profit to know whether the growth is worth having. Once you've got revenue straight, the next number to learn is your net profit margin.

Frequently asked questions

Is revenue the same as profit?

No. Revenue is the value of everything you sell in a period. Profit, or net income, is what's left once expenses are deducted from it.

When is revenue recognised?

When you've satisfied your performance obligation, which CFI says means when the customer obtains control. For a product that's on delivery; for a service it's when the work is done or as it's performed.

If a customer pays late, do I record revenue when the cash arrives?

No. You record the revenue when you deliver and the unpaid amount as accounts receivable. When the payment arrives, cash goes up and receivables go down, with no extra revenue.

What is the formula for revenue?

For products, units sold x average price. For services, customers x average price. For contract work, add up the value of each contract.

What is the difference between gross and net revenue?

CFI describes net sales as sales excluding returns, allowances and discounts. Gross is the figure before those come off.