A excessive working margin is clearly higher than a low one. Corporations that borrow to buy property, for instance, need wider margins to allow them to pay the curiosity on the debt and taxes whereas nonetheless having a big quantity left over to depend as internet earnings. Extra essential than a specific share, nevertheless, is to look again on the working margin over time. Various or erratic working margins is usually a signal of issues the corporate has in sustaining output and costs, or in controlling prices.