What Are Operating Expenses? Business Costs Explained

What Are Operating Expenses?

Operating expenses (OpEx) are the day-to-day costs of running your business — everything you spend to keep the doors open that is not the direct cost of making your product. Rent, employee salaries, marketing, software subscriptions, insurance, and utilities are all operating expenses. They appear on your profit and loss statement between gross profit and operating income.

Think of it this way: if you stopped selling tomorrow, the costs that would linger while you wind down — the lease, the salaried team, the insurance — are operating expenses. The costs that would vanish instantly because nothing is being produced — raw materials, production labor — are cost of goods sold instead. Sellers can see both layers interact in our Shopify Profit Calculator.

Common Operating Expense Categories

Category	Examples
Payroll	Salaries, wages, benefits, payroll taxes for non-production staff
Facilities	Rent, utilities, maintenance, cleaning, property insurance
Marketing & sales	Advertising, content, SEO tools, sales commissions
Technology	Software subscriptions, hosting, phones, IT support
Professional services	Accounting, legal, bookkeeping, consultants
Admin & other	Office supplies, bank fees, licenses, travel

Operating Expenses vs. COGS: The Key Split

The dividing line is directness. COGS (cost of goods sold) covers costs directly tied to each unit sold — the fabric in a shirt, the barista making a latte. Operating expenses cover everything else needed to run the business. Why does the split matter? Because it produces two different margins that diagnose two different problems:

• Gross margin (after COGS) reveals pricing and production efficiency.
• Operating margin (after OpEx) reveals whether the business itself is run lean.

A company can have a fantastic 70% gross margin and still lose money with bloated operating expenses — the classic story of startups that "can't miss" on product but drown in overhead. The other half of this split is cost of goods sold: the direct cost of each unit produced, which our companion COGS guide in this series covers in detail.

Worked Example: Operating Margin

A small marketing agency's monthly numbers:

Healthy gross margin, solid operating margin. But imagine OpEx crept to $38,000 — operating margin would collapse to 6.7% with gross margin untouched. When profit falls but gross margin holds, operating expenses are always the suspect.

OpEx Looks Different in Every Business Model

What counts as "normal" operating expense structure depends entirely on how the business works:

Business Model	Dominant OpEx	What to Watch
Freelancer / solo	Software, home office, insurance	Subscription creep; keep OpEx minimal
SaaS startup	Payroll (engineering, sales)	Headcount growth vs. revenue growth
E-commerce	Marketing, fulfillment staff	Ad spend efficiency (ROAS)
Restaurant / retail	Rent, hourly labor	Labor as % of revenue; lease terms
Agency	Salaries, client acquisition	Utilization rate of billable staff

The pattern: every model has one OpEx category that dominates, and that's where 80% of cost control happens. A SaaS founder obsessing over software subscriptions while payroll doubles is guarding the wrong door. Identify your dominant category, benchmark it against similar businesses, and put your cost discipline there first — the small categories take care of themselves.

Three questions to ask every month, whatever your model:

• Which single OpEx line grew fastest — and did revenue grow faster?
• What are we paying for that nobody used in 60 days?
• If revenue dropped 30% tomorrow, which costs could we cut within a week?

The third question is the important one: it maps your flexible versus committed costs before a crisis forces you to learn the difference.

5 Ways to Trim Operating Expenses

1. Audit subscriptions quarterly. Unused software seats are the most common silent leak — cancel anything untouched for 60 days.
2. Benchmark marketing spend. Tie every channel to return using our ROAS guide; cut what doesn't pay back.
3. Renegotiate annually. Rent, insurance, and vendor contracts are all negotiable — calendar a review, don't auto-renew.
4. Automate admin work before hiring for it: invoicing, bookkeeping, and scheduling tools are cheaper than headcount.
5. Track OpEx as a % of revenue monthly. A rising ratio is the early warning; a flat or falling one means growth is funding itself.

The Bottom Line

Operating expenses are the cost of being in business. You can't eliminate them, but separating them from COGS, watching operating margin monthly, and auditing the quiet leaks will keep them from silently eating a healthy gross margin. Schedule a 30-minute OpEx review on the same day each month — the habit matters more than the spreadsheet, because costs you look at regularly stay controlled while costs you ignore compound quietly.