Operating Expenditures (OPEX) are the ongoing expenses and costs associated with running a business. This includes salaries, utilities and other day-to-day expenses. It also includes taxes, insurance, marketing, and R&D. OPEX can have a big impact on the bottom line of your business since they are often recurring costs. That’s why it’s important to understand the difference between operating and capital expenditures so you can manage them appropriately and maximize profitability.