Backflush costing is a traditional and standard costing systems track costs as products pass from raw materials, to work in progress, to finished goods, and finally to sales. Such systems are called ’sequential tracking systems’ because the accounting system entries occur in the same order as purchases and production. Sequential tracking is common where management desires to track direct material and labor time to individual operations and products.

Backflush costing is a method of costing a product that works backwards: standard costs are allocated to finished products on the basis of the output of a repetitive manufacturing process. Used where inventory is kept at minimum this method obviates the need for detailed cost tracking required in absorption costing, and usually eliminates separate accounting for work-in-process. It also called backflush accounting. Backflush costing is in the Accounting and Auditing and Industries, Manufacturing, and Technology subjects. It is also an accounting system in which costs are applied to products when production is completed.

Backflush accounting is a product costing approach, used in a Just-In-Time (JIT) operating environment, in which costing is delayed until goods are finished. Standard costs are then flushed backward through the system to assign costs to products. The result is that detailed tracking of costs is eliminated. Journal entries to inventory accounts may be delayed until the time of product completion or even the time of sale, and standard costs are used to assign costs to units when journal entries are made, that is, to flush costs backward to the points at which inventories remain. It can be argued that backflush accounting simplifies costing since it ignores both labor variances and work-in-progress. Backflush accounting is employed where the overall cycle time is relatively short and inventory levels are low.

The implementation of a just-in-time philosophy necessitates changes. Backflush is a single step inventory process that typically occurs and the end of a production line.  To trigger the transactions a Work Order or Kanban card with a bar code or RFID tag are used.  When a product is packaged into a box or carton the operator wands the bar code. This triggers several events:    a)  A Carton Label is printed  b)  Open Quantity on the Work Order is reduced  c)  Materials on the bill of material are deducted from Raw Material Inventory  d)  Finished goods inventory is increased by the carton quantity and standard cost  e) Cost of the Finished Goods is based on Standard Cost of materials, labor and     overhead.

Backflush costing describes a costing system that delays recording some or all of the journal entries relating to the cycle from purchase of direct materials to the sale of finished goods. Where journal entries for one or more stages in the cycle are omitted, the journal entries for a subsequent stage use normal or standard costs to work backward to flush out the costs in the cycle for which journal entries were not made.  Backflushing simplifies costing and inventory transactions since it ignores both labor variances and work-in-progress. While in a true just-in-time environment there would be no work-in-progress at all, there will, in practice, be a small amount of work-in-progress at any point in time. It is important that standard costs are close to actual costs to keep inventory costing reasonable accurate. Back flush accounting is ideally suited to a just-in-time philosophy and is employed where the overall cycle time is relatively short and inventory levels are low. Material Variances are calculated regularly through physical counts and the resulting inventory adjustments. Labor Variances are calculated monthly by comparing the labor absorbed at standard cost to the actual payroll expenditures listed in the GL accounts.

There are some differences between backflush costing and inventory costing system using sequential tracking. These are as follows - Traditional normal and standard costing systems use sequential tracking, which is any product-costing method where recording of the journal entries occurs in the same order as actual purchases and progress in production. Backflush costing omits the recording of some or all of the journal entries relating to the cycle from purchase of direct materials to sale of finished goods.  Where journal entries for one or more stages in the cycle are omitted, the journal entries for a subsequent stage use normal or standard costs to work backward to flush out the costs in the cycle for which journal entries were not made.