This is because all fixed costs are not deducted from revenues unless all of the company's manufactured products are sold.
The absorption costing method is accepted by Inland Revenue as stock is not undervalued. On the debate between variable costing and absorption costing.
It is not practical to hold a manager accountable for costs over which he has no control. In addision, it is not particularly helpful for analysis designed to improve operational and financial efficiency, or for comparing product lines.
Besides, absorption costing is promoted by the advocates for the future benefits provided. This means that some companies will find variable costing extremely useful while other companies will find it less meaningful.
This is because the fixed costs are included into the product cost directly and is not deducted from the revenues until the sale is realized and products are actually sold.