What is operating income?

Operating income is the profit generated from core business operations, calculated as gross profit minus operating expenses. For professional service firms, operating income is Revenue minus Cost of Services minus Operating Expenses (rent, marketing, software, administrative salaries, insurance). Also called EBIT (Earnings Before Interest and Taxes), operating income measures business profitability before financing costs and taxes. A consulting firm with $500,000 in revenue, $250,000 in COGS, and $180,000 in operating expenses has $70,000 in operating income (14% operating margin).

Key characteristics of operating income

1. Formula: Gross Profit - Operating Expenses = Operating Income

2. Alternative formula: Revenue - COGS - Operating Expenses = Operating Income

3. Excludes: Interest expense, taxes, one-time gains/losses, non-operating income

4. Operating margin: Operating Income / Revenue × 100

5. Industry benchmarks: Consulting (15-25%), IT services (12-20%), Creative agencies (10-18%)

Why operating income matters for service firms

Operating income reveals whether core business operations are profitable before considering financing decisions and tax strategy. A firm with $100,000 operating income but $150,000 interest expense is operationally profitable but financially unprofitable due to excessive debt. Operating income enables comparison across firms with different capital structures: one firm might be debt-free, while another carries debt, but operating income shows the underlying business profitability. Improving operating income requires either increasing gross profit (higher revenue, lower COGS) or reducing operating expenses (overhead efficiency). Operating margin trending from 12% to 18% indicates operational improvement.

Example: Operating income calculation and analysis

Monthly P&L for consulting firm:

1. Revenue: $285,000

Cost of services:

1. Salaries (billable staff): $105,000

2. Contractors: $38,000

3. Benefits (billable): $18,000

4. Payroll taxes: $16,000

5. Direct project costs: $4,500

6. Total COGS: $181,500

7. Gross profit: $103,500 (36.3% margin)

Operating expenses:

1. Rent & facilities: $12,000

2. Software & technology: $8,200

3. Marketing & advertising: $11,500

4. Administrative salaries: $22,000

5. Professional services: $6,800

6. Insurance: $3,200

7. Office expenses: $2,400

8. Total operating expenses: $66,100

9. Operating income: $37,400 (13.1% operating margin)

Below operating income (not included):

1. Interest expense: -$1,800

2. Income before tax: $35,600

3. Net income: $35,600 (S-Corp, pass-through)

Analysis:

1. The operating margin of 13.1% is acceptable, but room to improve

2. Operating expenses are 23.2% of revenue (target: under 20%)

3. Opportunities:

4. Reduce marketing spend by 20% → saves $2,300/month

5. Renegotiate software licenses → saves $1,200/month

6. Outsource admin functions → saves $8,000/month

7. Potential operating income: $48,900 (17.1% margin)

8. Operating income focuses leadership on controllable profitability