Allocation. Definition: An allocation is the process of shifting overhead costs to cost objects, using a rational basis of allotment. Allocations are most commonly used to assign costs to produced goods, which then appear in the financial statements of a business in either the cost of goods sold or the inventory asset.If financial statements are not to be distributed outside of an entity, then there is less need to use allocations.llocations are most commonly used to assign costs to produced goods, which then appear in the financial statements of a business in either the cost of goods sold or the inventory asset. If financial statements are not to be distributed outside of an entity, then there is less need to use allocations.