# Operating Income: Formula, Calculation, and What It Tells Investors

Published: 2026-03-04
Author: Warren Team
URL: https://www.heywarren.com/blog/formula-for-operating-income

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Operating income is the profit a company generates from its core business operations after accounting for [cost of goods sold (COGS)](/blog/cost-of-goods-sold-computation) and operating expenses — but before deducting interest and taxes. Also called EBIT (Earnings Before Interest and Taxes) when no adjustments are involved, operating income is one of the most important measures of operational performance because it strips out financing decisions (interest paid on debt) and tax jurisdictions, allowing a clean comparison of how efficiently a business generates profit from its core activities. It is the starting point for enterprise value multiples, the primary driver of operating leverage analysis, and the metric most closely controlled by operational management.

## Operating Income Formula

**Operating Income = Revenue − Cost of Goods Sold (COGS) − Operating Expenses**

![How revenue flows down the income statement to operating income after subtracting COGS and operating expenses.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20660%20125%22%20width%3D%22660%22%20height%3D%22125%22%20role%3D%22img%22%3E%3Ctitle%3EFlow%20diagram%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%2230%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22115%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ERevenue%3C%2Ftext%3E%3Ctext%20x%3D%22115%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3E%2410%2C000%2C000%3C%2Ftext%3E%3Cline%20x1%3D%22205%22%20y1%3D%2262.5%22%20x2%3D%22237%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22244%2C62.5%20235%2C57.5%20235%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22245%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22330%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EGross%20Profit%3C%2Ftext%3E%3Ctext%20x%3D%22330%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3Eminus%20COGS%3C%2Ftext%3E%3Cline%20x1%3D%22420%22%20y1%3D%2262.5%22%20x2%3D%22452%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22459%2C62.5%20450%2C57.5%20450%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22460%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22545%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EOperating%20Income%3C%2Ftext%3E%3Ctext%20x%3D%22545%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3Eminus%20OpEx%3C%2Ftext%3E%3C%2Fsvg%3E)

*How revenue flows down the income statement to operating income after subtracting COGS and operating expenses.*

Or equivalently:

**Operating Income = Gross Profit − Operating Expenses**

Where operating expenses typically include:
- Selling, General & Administrative (SG&A) expenses
- Research & Development (R&D) expenses
- Depreciation and amortisation (D&A)
- Other recurring operating costs

**Note on D&A**: Depreciation and amortisation are non-cash charges included in operating expenses for [GAAP](https://www.fasb.org/) operating income. EBITDA adds them back; operating income (EBIT) does not.

## Step-by-Step Calculation

**Income statement example**:

| Line Item | Amount |
|---|---|
| Revenue | $10,000,000 |
| Cost of Goods Sold | ($4,000,000) |
| **Gross Profit** | **$6,000,000** |
| Gross Margin | 60% |
| [SG&A Expenses](/blog/sg-and-a) | ($2,500,000) |
| R&D Expenses | ($500,000) |
| Depreciation & Amortisation | ($400,000) |
| **Operating Income (EBIT)** | **$2,600,000** |
| [Operating Margin](/blog/calculate-operating-margin) | 26% |
| Interest Expense | ($300,000) |
| Pre-tax Income | $2,300,000 |
| Income Tax (25%) | ($575,000) |
| **Net Income** | **$1,725,000** |

Operating income = $6,000,000 − $2,500,000 − $500,000 − $400,000 = **$2,600,000**

## Operating Income vs. EBIT vs. EBITDA

These terms are related but distinct:

![EBITDA adds back $400,000 in D&A to arrive at a higher cash-flow proxy than GAAP operating income.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20800%20210%22%20width%3D%22800%22%20height%3D%22210%22%20role%3D%22img%22%3E%3Ctitle%3EComparison%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Ctext%20x%3D%22230%22%20y%3D%2257.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EOperating%20Income%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%2225%22%20width%3D%22390%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%232563eb%22%2F%3E%3Ctext%20x%3D%22642%22%20y%3D%2257.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%232563eb%22%3E%242.6M%3C%2Ftext%3E%3Ctext%20x%3D%22230%22%20y%3D%22152.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EEBITDA%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%22120%22%20width%3D%22450%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%237c3aed%22%2F%3E%3Ctext%20x%3D%22702%22%20y%3D%22152.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%237c3aed%22%3E%243.0M%3C%2Ftext%3E%3C%2Fsvg%3E)

*EBITDA adds back $400,000 in D&A to arrive at a higher cash-flow proxy than GAAP operating income.*

| Metric | Definition | Key Difference |
|---|---|---|
| Operating income | Revenue − COGS − OpEx (including D&A) | GAAP definition; includes D&A |
| EBIT | Earnings Before Interest and Tax | Usually = operating income; may include non-operating items |
| EBITDA | Earnings Before Interest, Tax, Depreciation, Amortisation | Adds back D&A to operating income |

In practice, EBIT and operating income are often used interchangeably. Strict EBIT may include non-operating items (e.g., gains on asset sales) that operating income excludes, but many analysts use them synonymously. EBITDA is a cash-flow proxy that adjusts for capital structure and investment cycle differences.

## Operating Margin: The Critical Ratio

**Operating Margin = Operating Income / Revenue**

Operating margin tells you what percentage of revenue the company retains after all operational costs (before interest and taxes). It is the most widely used metric for:
- Comparing profitability across peers in the same industry
- Tracking operating leverage over time
- Identifying businesses with pricing power vs. commodity economics

Industry benchmarks:
- Software/SaaS: 20–35% operating margins (high gross margin + scalable cost structure)
- Pharmaceutical: 25–35% (patent-protected pricing + high R&D)
- Retail: 2–6% (volume-dependent, thin margins)
- Airlines: 5–15% (operating leverage amplifies cycles)
- Consumer staples: 15–25% (stable volume, brand pricing)

## Operating Leverage

Operating leverage refers to how sensitive operating income is to changes in revenue:

![A 20% revenue increase produces a 47% operating income increase, illustrating a DOL of 2.3.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20800%20210%22%20width%3D%22800%22%20height%3D%22210%22%20role%3D%22img%22%3E%3Ctitle%3EComparison%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Ctext%20x%3D%22230%22%20y%3D%2257.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ERevenue%20%2450M%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%2225%22%20width%3D%22306.8181818181818%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%232563eb%22%2F%3E%3Ctext%20x%3D%22558.8181818181818%22%20y%3D%2257.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%232563eb%22%3E%2415M%3C%2Ftext%3E%3Ctext%20x%3D%22230%22%20y%3D%22152.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ERevenue%20%2460M%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%22120%22%20width%3D%22450%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%237c3aed%22%2F%3E%3Ctext%20x%3D%22702%22%20y%3D%22152.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%237c3aed%22%3E%2422M%3C%2Ftext%3E%3C%2Fsvg%3E)

*A 20% revenue increase produces a 47% operating income increase, illustrating a DOL of 2.3.*

**Degree of Operating Leverage (DOL) = % Change in Operating Income / % Change in Revenue**

A business with high fixed costs and low variable costs has high operating leverage: a 10% revenue increase might produce a 30% increase in operating income (DOL = 3.0). This same leverage amplifies losses when revenue falls.

**Example**: A software company with 70% gross margins and $20M fixed costs:
- At $50M revenue: Operating income = $35M − $20M = $15M; margin = 30%
- At $60M revenue: Operating income = $42M − $20M = $22M; margin = 37%
- $10M (20%) revenue increase → $7M (47%) operating income increase → DOL ≈ 2.3

Understanding operating leverage is essential for stress-testing earnings in downturns and understanding why certain industries are more cyclical than others.

## What Reduces Operating Income

- Rising COGS (raw material inflation, labour cost increases, supply chain disruptions)
- Increased SG&A (headcount additions, higher marketing spend, office costs)
- Higher D&A (large capital investments create future depreciation drag)
- Revenue decline without proportional cost reduction (negative operating leverage)

Investors watch for operating income declines even when revenue grows — this signals cost discipline failure and margin compression.

## Conclusion

Operating income is the clean measure of what a business earns from running its operations, excluding financing and tax decisions. The formula is straightforward — gross profit minus operating expenses — but the metric reveals the core economics of the business: how much of every revenue dollar flows through to operational profit. Operating margin benchmarks, operating leverage calculations, and EBIT multiples (used in enterprise value analysis) all flow from this single line item. For related financial metrics, see our guides on [calculating EBIT](/blog/calculating-ebit) and [EBITDA to EV](/blog/ebitda-to-ev).

Warren at [heywarren.com](https://heywarren.com) helps investors build financial models, analyse operating performance, and compare profitability across companies and industries.

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## Related Reading

**More from Warren**:
- [EBITDA to EV: What the Multiple Measures and How to Use It](/blog/ebitda-to-ev)
- [Profit and Loss Statement: How to Read a P&L and What It Tells Investors](/blog/profit-and-loss-statement)
- [Contribution Margin: Formula, Calculation, and How to Use It](/blog/calculation-contribution-margin)

**Authoritative sources**:
- [FASB ASC 225 — Income Statement](https://asc.fasb.org/225)
- [SEC — Income Statement Guidance](https://www.sec.gov/divisions/corpfin/cfguidance.shtml)
- [CFA Institute — Financial Analysis](https://www.cfainstitute.org/en/membership/professional-development/refresher-readings/financial-analysis-techniques)