What is throughput accounting?

Throughput accounting is an alternative to traditional internal cost reporting. It stems from the Theory of Constraints, which I won’t detail here, but essentially this theory suggests an organisational can best achieve its goals (e.g. profit) by maximising it use of a constraining resource.  A constraint could be machine capacity for example, and by maximising throughput on the constraint profit is maximised. To report on throughput, a new accounting approach is required, called throughput accounting:

1) Totally variable costs – this means a cost which is incurred only when a product/service is created. This often means only material costs. Labour costs are not totally variable, as employees are typically paid regardless. Some transportation or subcontracting costs may be totally variable. All overhead costs are not totally variable.
2) Throughput – this refers to revenue less totally variable costs.  Contribution using throughput accounting is likely to be higher.
3) Operating expenses – this refers to all costs other than totally variable costs. Operating expenses are not distinguished into categories such as fixed or variable, or allocated to products in any way i.e they are similar to period costs, as they are costs which are more
associated with the passage of time than with products.
4) Net profit – in throughput accounting, the net profit is simply throughput minus operating expenses.

Looking at 1-4 above, you can see no attempt is made to allocate any overhead cost, so throughput accounting does not meet normal GAAP requirements. It does however raise the possibility of selling products/services at a price which is lower than under normal cost accounting, and it may also be useful for short-term decision making.  Below is an example of a profit statements from Burns et al (2013. p. 112), which shows how throughput accounting produces a differing view on costing.

The overall net profit figure is exactly the same, but you can see a much bigger contribution under the throughput method. Arguably, as only material costs (in this example) are totally variable, a report such as the one above is very useful for short term decision-making.

References:

Management Accounting, Burns,Quinn, Warren & Oliveira, McGraw-Hill, 2013 – see burnsetal.com