Net Income Calculator (business income statement)

Understanding the net income calculator — concept and principle

This calculator builds a simple multi-step income statement, from net sales down to net income. It shows gross profit, operating income (EBIT), income before tax, income tax, net income, the net profit margin, EBITDA and the effective tax rate. Small-business owners, students and analysts use it to see how each layer of cost reduces revenue to the bottom line.

From sales down to the bottom line — with the default inputs: $96,380.

How it is calculated

Gross profit = net sales − cost of goods sold
Operating income (EBIT) = gross profit − operating expenses − depreciation and amortization
Income before tax = operating income − interest expense + other income
Income tax = income before tax × tax rate (no tax on a loss)
Net income = income before tax − income tax
Net profit margin = net income ÷ net sales × 100; EBITDA = EBIT + D&A

The principle

A multi-step income statement separates profit into layers so you can see where money is earned and lost. Gross profit shows what is left after the direct cost of the products. Operating income adds the costs of running the business. Interest and other income sit below operations because they depend on financing and side activities. Tax comes last. Using one flat tax rate is a simplification: real tax depends on brackets, credits, losses carried forward and local taxes. The page's default of 21% is the US federal corporate rate.

Worked example

Defaults: net sales 850,000; COGS 420,000; operating expenses 260,000; D&A 35,000; interest 18,000; other income 5,000; tax rate 21%.

Gross profit = 850,000 − 420,000 = $430,000.
Operating income = 430,000 − 260,000 − 35,000 = $135,000; EBITDA = $170,000.
Income before tax = 135,000 − 18,000 + 5,000 = $122,000.
Income tax = 122,000 × 21% = $25,620; effective rate 21%.
Net income = 122,000 − 25,620 = $96,380; margin = 96,380 ÷ 850,000 = 11.3%.

Each point is the calculator re-run with only “Net sales (revenue)” changed; the gold point is the default example. Change the inputs above and this chart follows your numbers.

Net sales (revenue)	Net income
212,500	-$515,500
425,000	-$303,000
637,500	-$90,500
850,000	$96,380
1.06e+06	$264,255
1.28e+06	$432,130
1.7e+06	$767,880

How to read the result

Compare each layer with revenue. Here roughly half of sales is left after COGS, 15.9% after operating costs and 11.3% after interest and tax. If net margin is low, the layers show where to look: product costs, overheads, debt or tax. Margins vary widely by industry, so compare with similar businesses and with your own past years.

Common mistakes

Counting depreciation inside operating expenses and again on its own line.
Entering other losses as a positive number; use a minus sign.
Applying tax to a loss.
Treating net income as cash; timing and non-cash items differ.

Keep in mind: The tax line uses one flat rate. Real tax calculations are more complex; this is not accounting or tax advice.

Frequently asked questions

What is the difference between net income and operating income?

Operating income is profit from the business itself; net income is what remains after interest, other items and tax.

What is a good net profit margin?

It depends on the industry. Compare with similar businesses rather than a single benchmark.

Why does the effective rate equal the tax rate here?

Because the calculator applies one flat rate to positive pre-tax income; real effective rates differ.

Sources: OpenStax, Principles of Accounting, Volume 1: Financial Accounting, section 6.6 (multi-step income statement) · U.S. Internal Revenue Code §11(b) (21% corporate rate)

Checked 9 Nov 2026. Multi-step income statement (net sales − COGS = gross margin; − operating expenses = income from operations; ± other revenue and expenses): OpenStax, “Principles of Accounting, Volume 1: Financial Accounting”, section 6.6. US corporate rate 21%: Internal Revenue Code §11(b).

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