Manufacturing overhead can be a bit tricky to understand at first, but basically it includes all the indirect costs associated with the production process. This means things like electricity, water, and gas that power your machinery are part of it, as well as depreciation on your equipment and factory maintenance costs. Labor costs, however, are usually considered direct costs if they're directly involved in producing the product, but if you have supervisors or quality control staff, their salaries might be included in manufacturing overhead. Rent is also typically part of it, as well as insurance on your factory and equipment.