How managers use this information
Managerial accounting is much more customizable than financial accounting, and therefore, it can provide many more practical tools for managers. That's particularly true when used in selling and administrative expenses.
As you can probably tell already, selling and administrative expenses are a bit of a mixed bag. They include highly variable expenses such as marketing as well as mostly fixed expenses such as rent. Because of this dynamic, a manager analyzing these numbers should make sure to distinguish between the company's baseline fixed costs and the incremental variable costs that rise and fall over time. The variable expenses could correlate to sales, headcount, or capital spending. A proper analysis must dive into this level of granularity to fully understand how the company's strategy and tactics will influence its expenses.
Part of this process is subdividing the broad "selling and administrative" expenses into smaller, more useful subgroups. For example, a company's marketing budget will certainly be reviewed independently of its engineering expenses. However, it could be useful to review marketing and sales expenses together as one group relative to sales or sales growth. These choices are at the management's discretion based on the company's business model and objectives. Again, with managerial accounting, there are no regulated standards; the reports and modeling should be designed to fit what the company's management needs to run the business, not what investors need to understand its performance.
That said, don't underestimate the significance of these managerial decisions on how the company drives investor returns. These reports frame management's view of the business. How management decides to group and analyze its expenses implicitly defines how they view and understand the company. Management makes decisions based on the data they have available, and these managerial accounting decisions give context to the data. A poorly structured selling and administrative expense budget can affect not just tactics but also strategy.
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