Net Income Formula: How to Calculate Your Bottom Line
By ToolNimba Editorial Team June 20, 2026 5 min read
Quick answer
Net income = total revenue minus all expenses, including the cost of goods sold, operating costs, interest and taxes. It is the final profit figure, often called the bottom line, that tells you what a business actually keeps after paying for everything.
Net income is the single most quoted number in finance. Investors check it, lenders study it and business owners live or die by it. Yet many people confuse it with revenue, gross profit or cash in the bank. This guide breaks the net income formula down into plain language, walks through a full example and shows you exactly where each dollar disappears between the top line and the bottom line.
What is the net income formula?
At its core the formula is simple. You start with everything you earned and subtract everything it cost you to earn it:
The formula
Net Income = Total Revenue minus Total Expenses
Total expenses is the key phrase. It is not just the obvious costs. It includes the cost of goods sold, salaries, rent, marketing, depreciation, interest on any loans and the taxes you owe. Once all of those are removed, whatever remains is net income. If expenses are larger than revenue, the result is negative and you have a net loss instead.
Accountants often write out the longer version that mirrors an income statement: Net Income = Revenue minus Cost of Goods Sold minus Operating Expenses minus Interest minus Taxes. Both versions describe the same journey from the top line to the bottom line.
Revenue vs gross profit vs net income
These three terms sit at different levels of the income statement, and mixing them up is the most common source of confusion. Think of an income statement as a staircase that steps down from the largest number to the smallest.
How profit narrows from the top line to the bottom line
| Level | What it means | What is subtracted |
|---|---|---|
| Revenue | All money earned from sales (the top line) | Nothing yet |
| Gross profit | Profit after direct production costs | Cost of goods sold |
| Operating income | Profit from core operations | Operating expenses, depreciation |
| Pre-tax income | Profit before the tax bill | Interest expense |
| Net income | The bottom line you actually keep | Income taxes |
Notice that net income sits at the very bottom. Every other figure above it is still missing one or more categories of expense. That is why a company can post huge revenue and still report a tiny net income, or even a loss, if its costs are heavy. If you also want to express net income as a percentage of sales, see our guide on how to calculate profit margin.
Worked example: net income step by step
Imagine a small online furniture store called Maple Lane for one year. Here is how to take its raw numbers and arrive at net income.
- Start with total revenue. Maple Lane sold 200,000 dollars of furniture during the year. This is the top line.
- Subtract the cost of goods sold. The wood, fabric and shipping for those products cost 90,000 dollars. Revenue minus COGS gives a gross profit of 110,000 dollars.
- Subtract operating expenses. Salaries, rent, software and marketing came to 60,000 dollars. That leaves operating income of 50,000 dollars.
- Subtract interest. The business pays 5,000 dollars in interest on a startup loan, leaving pre-tax income of 45,000 dollars.
- Subtract taxes. At a 20 percent tax rate, the tax bill is 9,000 dollars. Pre-tax income minus tax gives a net income of 36,000 dollars.
So Maple Lane kept 36,000 dollars out of 200,000 dollars in sales. That is the bottom line. The owner can reinvest it, save it or pay it out, and it is also the figure that flows into retained earnings on the balance sheet.
Net income for individuals
The same idea applies to personal finances, just with different labels. For a person, net income usually means take home pay: your gross salary minus taxes, retirement contributions, health insurance and other payroll deductions. It is the amount that actually lands in your bank account.
- Gross income is your salary or wages before anything is taken out.
- Deductions include income tax, social security, health premiums and retirement savings.
- Net income is what remains, the money you can budget and spend.
If you are paid annually but budget monthly, you may want to convert that figure. Our walkthrough on how to calculate monthly income shows how to turn a yearly net figure into a clean monthly number you can plan around.
Common mistakes to avoid
Net income looks simple, but a few errors trip people up again and again. Watch for these:
- Confusing net income with cash flow. Net income includes non cash items like depreciation, so a profitable company can still be short on cash, and vice versa.
- Forgetting taxes and interest. Stopping at operating income overstates what you keep. Net income only counts after interest and taxes are removed.
- Mixing up revenue and net income. Revenue is the top line; net income is the bottom line. A high revenue figure says nothing about profitability.
- Ignoring one time items. Large one off gains or losses, such as selling equipment, can distort net income for a single period.
- Using the wrong tax rate. Apply the effective rate that actually hits the business, not a guessed headline percentage.
Why net income matters
Net income is the foundation for many of the metrics that drive decisions. Earnings per share, profit margin and return on equity all start from this number. Lenders use it to judge whether a business can repay debt, and investors use it to value a company. For an individual, net income is the honest budget number, because you cannot spend gross pay you never received.
Tracking net income over several periods is more useful than any single snapshot. A rising bottom line, even on flat revenue, signals that a business is controlling costs well. A falling bottom line on rising revenue is a warning that expenses are growing faster than sales.
Good to know
Net income is sometimes called net profit, net earnings or simply the bottom line. They all refer to the same final figure: total revenue minus all expenses including interest and taxes.