Throughput accounting focuses on maximizing throughput, which is defined as sales minus material costs. It recognizes direct materials as the only variable cost, and classifies all other direct costs like labor as fixed costs. A key concept is the bottleneck resource, which is the limiting factor that prevents higher output. The objective is to maximize throughput by fully utilizing the bottleneck resource. The theory of constraints states that management should focus on increasing the capacity of the bottleneck to improve throughput. Throughput accounting calculates ratios to evaluate productivity and identify ways to increase throughput, such as by raising prices, improving efficiency, or reducing costs.

1. Lecture Topic:
Introduction

Throughput is the money generated from sales minus the cost of the materials used in making
items
sold. i.e.
Throughput = Sales - Material cost
In throughput accounting all other direct costs except direct material are recognised as
costs. For instance, direct labour is added with indirect materials and other overheads to form
conversion costs.
Throughput accounting recognise direct material only as variable cost. Direct labour and direct
expenses are recognised as fixed costs.
Bottleneck resource

A bottleneck resource is a limiting factor or a constraint that prevent output and throughput
getting higher. So a bottleneck resource can be a production factor such as machine time or
time or it can be lack of product quality etc.. So when they is a bottleneck resource, the objective
of an organisation should be to maximise throughput. Bottleneck resource is also called binding
constraint.
Theory of constraints (TOC)
It is an approach to production management which aims to maximise sales revenue less material
cost. It concentrates on bottlenecks which are constraints or limiting factors that prevent
During the lecture, take notes here. Insert a sub-page for each lecture topic.
Important Points:
 Introduction
 Bottleneck resource and theory of
constraints
 Similarities of throughput accounting
marginal costing
 Difference between conventional cost
accounting and throughput accounting
 Concepts underpinning throughput
accounting
 Factors that affect the value of
throughput accounting
Limitations of throughput accounting

 Throughput accounting ratio (TPAR)
 Ways to improve a throughput
accounting ratio
 Steps in throughput accounting
Today's Topics:
Homework:
Throughput accounting
Sunday, 10 October 2021
1:09 pm
Throughput Page 1

2. cost. It concentrates on bottlenecks which are constraints or limiting factors that prevent
maximisation of throughput. TOC says that they is no need to hold inventory as inventory costs
money in terms of storage space etc..
The theory of constraints states that the aim of management should be to maximise total
throughput and the only way to increase throughput is by increasing the capacity of the
constraint. Management should focus on increasing the capacity of the bottleneck resource.
For example, time on Machine Type X may be a bottleneck resource. The only way to increase
throughput is to increase the output capacity of Machine Type X.
○ Moving from working 5 days a week to working 6 or 7 days a week
○ Moving from working a 12-hour production day to an 18-hour or 24-hour production day
○ Carrying out routine maintenance work on the machine outside normal working hours, so
that maintenance does not disrupt production.
Ways in which this might be done, without buying a new Type X machine, could include:
If the capacity of a bottleneck resource is elevated (increased) sufficiently it will eventually
to be a bottleneck resource. Another resource in the system will become the new bottleneck
resource. The same approach is now going to be used for the new bottleneck resource.
Similarity of throughput accounting to marginal costing terminology

The following are the similarities of throughput accounting to marginal costing terminologies:
Marginal costing Throughput accounting
Variable Cost = Direct Material Cost
Fixed Cost = Total Factory Cost (Including labour cost)
Contribution (Sales – Variable Cost) = Throughput (Sales – Direct Material Cost)
Difference between conventional cost accounting andthroughput accounting

The following are the differences between conventional cost accounting and throughput
accounting:
Conventional cost accounting Throughput accounting
Inventory is an asset Inventory is not an asset. It is a barrier to
making profit.
Costs can be classified as direct or
indirect.
Such classification is no longer useful hence
they is no such classification
Direct labour is a variable cost All labour costs are fixed costs and are part
total factory cost (TFC)
Profitability is determined by deducting a
product cost from selling price.
Profitability is determined by the rate at
which money or throughput is earned.
 Concepts underpinning throughput accounting
Throughput accounting is based on following concepts:
Throughput Page 2

3. Cost behavior
a.
In the short-term all manufacturing cost with the exception of material cost are fixed
These fixed costs include direct labour. It is useful to group all these costs together and
call them Total Factory Costs (TFC).
Inventory
b.
Throughput is only created when a finished output has been sold. So by keeping
items as stock, this prevent throughput from being made. Therefore, managers should
always think of increasing throughput while at the same time tries to reduce inventory
operational expenses. Managers should look for best ways to reduce stock as soon as
possible. Just in Time (JIT) technique may be used which require products to be made
when customers has ordered them to have inventory level at zero.
Throughput accounting is based on following concepts:
The selling price of the item sold. When the price increases this can increase throughput.
a.
b. The purchase of cost of direct materials. The higher the cost of acquiring materials the
lower the throughput.
Efficiency in the usage of direct materials. If direct materials are used efficiently, the
of materials per unit will be reduced.
c.
Machine capacities
d.
e. Human resources
f. Materials in scarcity
Factors that affect the value of throughput accounting

In order to maximise throughput, managers should try their best to find bottlenecks and remove
them. When its impossible to remove the bottlenecks, the managers should ensure that those
bottlenecks are fully utilised.
Limitations of throughput accounting

Selling price may be uncompetitive.
a.
Suppliers of materials may not be reliable. For instance stoppage in supply may affect
production and thereby affecting throughput.
b.
c. Product quality may be low.
d. Need to deliver the goods sold in time. Sometimes goods delivery may be delayed and
goods may become stock and thereby affecting throughput.
e. Very little attention is paid to overhead costs. If overheads are high profits will be
The following are the limitations of throughput accounting:
 Throughput accounting ratio (TPAR)
The throughput accounting ratio (TA ratio or TPAR) is the ratio of the throughput per unit of
bottleneck resource to the factory cost per unit of bottleneck resource. The definition means
we first calculate the throughput and divide it with usage of the bottleneck resource to get
throughput per unit of bottleneck resource. Then we calculate total factory costs and divide it
the limiting factor to get factory cost per unit of bottleneck resource. Finally we divide the
throughput per unit of bottleneck resource with factory cost per unit of bottleneck resource.
The throughput accounting ratio (TA ratio) is a useful ratio and below is the formula for
calculating it:
TPAR = Throughput per unit of bottleneck resource
Throughput Page 3

4. TPAR = Throughput per unit of bottleneck resource
Factory cost per unit of bottleneck resource
(Note: Instead of ‘per unit of bottleneck resource’, you may come across the term ‘per factory
hour’. This means the same thing in this context.)
The factory cost per unit of bottleneck resource (factory hour) is calculated using the following
formula:
Factory cost per unit of bottleneck resource = Total factory costs .
Total units of bottleneck resource
Total throughput should exceed total factory costs; otherwise the organisation will make a loss.
This means that the TA ratio should exceed 1.0. A TA ratio that is below 1.0 is likely not
profitable.
Products can be ranked in order of priority. Higher TA ratios should be given priority over lower
TA ratios.
Note:
Note that ranking products in order of priority according to their TA ratio will always give the
same ranking as putting them in order of throughput per unit of bottleneck resource.
 Ways of improve a throughput accounting ratio for a business
By increasing selling price - when a product has the lowest selling price and they is
little or no inventory for the product it mean that they is potential of selling all the units
even if the price is increased. Hence the price should be increased which will increase
TPAR. But if the business faces tough price competition a price increase could simply
result in lower sales hence they is no need to increase the price.
a.
b. Increase the speed of the machine process or efficiency of the machine - if a machine is
identified as a bottleneck if the capacity or speed of processing is increased this will
increase throughput. This can be achieved by increasing productivity if the workforce
through more training etc.
c. By reducing factory costs - they is a need to investigate the factory costs to determine if
there is any way to make cost savings. Some items can be outsourced or find alternative
cheap supplies to reduce the costs.
d. By reducing material costs - check if they are opportunities to buy the materials from
alternative suppliers that are cheaper. But they is a need to be much careful as cheaper
materials may sometimes be of low quality which may have impact on the quality of the
final product. Sometimes bulk buying may result in discounts but the cost of holding
those materials as inventory may outweigh the benefit gained from the discount.
e. Elevating the bottleneck - sometimes by increasing the capacity of the bottleneck
resource can increase throughput. This can be done by buying a new machine for
instance to increase the hours.
In an exam question on throughput accounting, you may be asked to explain ways in which the
TA ratio for a product might be increased. The following are the ways TPAR can be improved:
Steps in throughput accounting

1. To identify the bottleneck resource.
2. Concentrate on each bottleneck to ensure that they are all being fully and efficiently
The following are the steps in throughput accounting:
Throughput Page 4

5. 2. Concentrate on each bottleneck to ensure that they are all being fully and efficiently
utilised. So they is a need to decide on how to exploit the constraint in order to maximise
throughput.
3. Scale down or rank the throughput of non-bottleneck activities to match what can be
with by the bottleneck.
4. Remove the bottleneck if possible
5. Since throughput accounting is a continues improvement process, return to step 1 and
evaluate the system now that bottlenecks have been removed.
Summary


After the lecture, use this space to summarize the main points of this Lecture
Topic.
Throughput Page 5