Indian Institute of Management Rohtak
Management Accounting
Session 14
Activity Based Costing
By
Prof Archana Patro
Background
• Recall that Factory Overhead is applied to
production in a rational systematic manner, using
some type of averaging. There are a variety of
methods to accomplish this goal.
• These methods often involve tradeoffs between
simplicity and realism
Simple Methods Complex Methods
Unrealistic Realistic
Background
• Historically, firms produced a limited variety
of goods while their indirect costs were
relatively small.
• Allocating overhead costs was simple: use
broad averages to allocate costs uniformly
regardless of how they are actually incurred
Peanut-butter Costing
• The end-result: overcosting and undercosting
Over and Undercosting
• Overcosting – a product consumes a low level
of resources but is allocated high costs per unit
• Undercosting – a product consumes a high
level of resources but is allocated low costs per
unit
Cross-subsidization
• The results of overcosting one product and
undercosting another.
• The overcosted product absorbs too much cost,
making it seem less profitable than it really is
• The undercosted product is left with too little
cost, making it seem more profitable than it
really is
Activity–Based Costing (ABC)
• ABC is designed to provide managers with cost
information for strategic and other decisions that
potentially affect capacity and therefore affect
“fixed” as well a s variable costs.
• ABC is a good supplement to traditional cost
system rather than Replacement
Activity-Based Management
• A method of management that used ABC as an
integral part in critical decision-making
situations, including:
Pricing & product-mix decisions
Cost reduction & process improvement decisions
Design decisions
Planning & managing activities
Learning Objective 1
Understand activity-based costing and how
it differs from a traditional costing system.
How Costs are Treated Under
Activity–Based Costing
ABC differs from traditional cost accounting in three ways.
Manufacturing Nonmanufacturing
costs costs
Traditional ABC
product costing product costing
ABC assigns both types of costs to products.
How Costs are Treated Under
Activity–Based Costing
ABC differs from traditional cost accounting in three ways.
Manufacturing Nonmanufacturing
costs costs
Some
All
Traditional ABC
product costing product costing
ABC does not assign all manufacturing costs to products.
How Costs are Treated Under
Activity–Based Costing
ABC differs from traditional cost accounting in three ways.
Level of complexity
Activity–Based
Costing
Departmental
Overhead
Rates
Plantwide
Overhead
Rate
Number of cost pools
ABC uses more cost pools.
How Costs are Treated Under
Activity–Based Costing
ABC differs from traditional cost accounting in three ways.
Each ABC cost pool has its
own unique measure of activity.
Traditional cost systems usually rely
on volume measures such as direct labor
hours and/or machine hours to allocate
all overhead costs to products.
ABC uses more cost pools.
How Costs are Treated Under
Activity–Based Costing
An event that causes the
Activity consumption of overhead
resources.
A “cost bucket” in which costs
Activity
related to a single activity
Cost Pool measure are accumulated.
$$
$
$ $
$
How Costs are Treated Under
Activity–Based Costing
The term cost driver is
Activity
also used to refer to an
Measure
activity measure.
An allocation base
in an activity-based
costing system.
How Costs are Treated Under
Activity–Based Costing
Two common types of activity measures:
Transaction Duration
driver driver
Simple count A measure
of the number of of the amount
times an activity of time needed
occurs. for an activity.
How Costs are Treated Under
Activity–Based Costing
ABC defines
five levels of activity
that largely do not relate
to the volume of units
produced.
Traditional cost systems usually rely on volume
measures such as direct labor hours and/or machine
hours to allocate all overhead costs to products.
How Costs are Treated Under
Activity–Based Costing
Unit-Level Batch-Level
Activity Activity
Manufacturing
companies typically combine
their activities into five
classifications.
Product-Level Customer-Level
Activity Organization- Activity
sustaining
Activity
Characteristics of Successful ABC
Implementations
Strong top
management support
Link to evaluations
and rewards
Cross-functional
involvement
Baxter Battery – An ABC Example
Baxter Battery Company
Income Statement
Year Ended December 31, 2009
Sales $ 50,000,000
Cost of goods sold
Direct materials $ 15,000,000
Direct labor 12,000,000
Manufacturing overhead 14,000,000 41,000,000
Gross margin 9,000,000
Selling and administrative expenses
Shipping expenses 3,000,000
Marketing expenses 2,000,000
General administrative expenses 6,000,000 11,000,000
Net operating income
loss $ (2,000,000)
Manufacturing overhead is allocated to products using
a single plantwide overhead rate based on machine hours.
Define Activities, Activity Cost Pools,
and Activity Measures
At Baxter Battery, the ABC team, selected the following
activity cost pools and activity measures:
Define Activities, Activity Cost Pools,
and Activity Measures
• Customer Orders - assigned all costs of resources that are
consumed by taking and processing customer orders.
• Design Changes - assigned all costs of resources consumed
by customer requested design changes.
• Order Size - assigned all costs of resources consumed as a
consequence of the number of units produced.
• Customer Relations – assigned all costs associated with
maintaining relations with customers.
• Other – assigned all organization-sustaining costs and
unused capacity costs
Learning Objective 2
Assign costs to cost pools using a
first-stage allocation.
Assign Overhead Costs to Activity Cost
Pools
Assign Overhead Costs to Activity Cost
Pools
Direct materials, direct labor, and shipping are excluded
because Baxter Battery’s existing cost system can directly
trace these costs to products or customer orders.
Assign Overhead Costs to Activity Cost
Pools
At Baxter Battery the following distribution of resource
consumption across activity cost pools is determined.
Assign Overhead Costs to Activity Cost
Pools
Indirect factory wages $6,000,000
Percent consumed by customer orders 30%
$1,800,000
Assign Overhead Costs to Activity
Cost
Pools
Factory equipment depreciation $3,500,000
Percent consumed by customer orders 20%
$ 700,000
Assign Overhead Costs to Activity Cost
Pools
Learning Objective 3
Compute activity
rates for cost pools.
Calculate Activity Rates
The ABC team determines that Baxter Battery will
have these total activities for each activity cost pool
...
– 10,000 customer orders,
– 4,000 design changes,
– 800,000 machine-hours,
– 2,000 customers served.
Now the team can compute the individual
activity rates by dividing the total cost for each
activity by the total activity levels.
Calculate Activity Rates
Activity–Based Costing at Baxter Battery
Direct Direct Shipping
Overhead Costs
Materials Labor Costs
Traced Traced Traced
Cost Objects:
Products, Customer Orders, Customers
Activity–Based Costing at Baxter
Battery
Direct Direct Shipping
Overhead Costs
Materials Labor Costs
First-Stage Allocation
Customer Design Order Customer
Other
Orders Changes Size Relations
Cost Objects:
Products, Customer Orders, Customers
Activity–Based Costing at Baxter
Battery
Direct Direct Shipping
Overhead Costs
Materials Labor Costs
First-Stage Allocation
Customer Design Order Customer
Other
Orders Changes Size Relations
Second-Stage Allocations
$/Order $/Change $/MH $/Customer
Cost Objects:
Unallocated
Products, Customer Orders, Customers
Learning Objective 4
Assign costs to a cost object using a
second-stage allocation.
Assigning Overhead to Products
Baxter Battery Information
SureStart
1. Requires no new design resources.
2. 800,000 batteries ordered with 4,000 separate orders.
3. Each SureStart requires 36 minutes of machine
time for a total of 480,000 machine-hours.
LongLife
1. Requires new design resources.
2. 400,000 batteries ordered with 6,000 separate orders.
3. 4,000 custom designs prepared.
4. Each LongLife requires 48 minutes of machine
time for a total of 320,000 machine-hours.
Assigning Overhead to Products
Assigning Overhead to Customers
Let’s take a look at how Baxter Battery’s system works for just one of the 2,000
customers – Acme Auto Parts who placed a total of twelve orders. Note that
the four orders for Long Lifes required a design change.
Orders
1. Eight orders for 60 SureStarts per order.
2. Four orders for 50 LongLifes per order.
Machine-hours
1. The 480 SureStarts required 288 machine-hours.
2. The 200 LongLifes required 160 machine hours.
Assigning Overhead to Customers
Learning Objective 5
Use activity-based costing to compute
product and customer margins.
Prepare Management Reports
Product Margin Calculations
The first step in computing product margins is to
gather each product’s sales and direct cost data.
SureStarts LongLifes Total
Sales $ 31,300,000 $ 18,700,000 $ 50,000,000
Direct costs
Direct material 9,000,000 6,000,000 15,000,000
Direct labor 7,000,000 5,000,000 12,000,000
Shipping 2,000,000 1,000,000 3,000,000
Prepare Management Reports
Product Margin Calculations
The second step in computing product margins is to
incorporate the previously computed activity-based
cost assignments pertaining to each product.
SureStarts LongLifes Total
Sales $ 31,300,000 $ 18,700,000 $ 50,000,000
Direct costs
Direct material 9,000,000 6,000,000 15,000,000
Direct labor 7,000,000 5,000,000 12,000,000
Shipping 2,000,000 1,000,000 3,000,000
ABC cost assignments
Customer orders 1,808,000 2,712,000 4,520,000
Design changes 3,040,000 3,040,000
Order size 3,120,000 2,080,000 5,200,000
Prepare Management Reports
Product Margin Calculations
The third step in computing product
margins is to deduct each product’s
direct and indirect costs from sales.
SureStarts LongLifes
Sales $ 31,300,000 $ 18,700,000
Costs
Direct material $ 9,000,000 $ 6,000,000
Direct labor 7,000,000 5,000,000
Shipping 2,000,000 1,000,000
Customer orders 1,808,000 2,712,000
Design changes 3,040,000
Order size 3,120,000 2,080,000
Total cost 22,928,000 19,832,000
Product margin $ 8,372,000 $ (1,132,000)
Prepare Management Reports
Product Margin Calculations
The product margins can be reconciled with
the company’s net operating income as follows:
SureStarts LongLifes Total
Sales $ 31,300,000 $ 18,700,000 $ 50,000,000
Total costs 22,928,000 19,832,000 42,760,000
Product margins $ 8,372,000 $ (1,132,000) $ 7,240,000
Less costs not assigned to products:
Customer relations 3,080,000
Other 6,160,000
Total 9,240,000
Nett operating income
loss $ (2,000,000)
Prepare Management Reports
Customer Margin Analysis
The first step in computing Acme Auto Parts’ customer
margin is to gather its sales and direct cost data.
Acme Auto
Parts
Sales $ 29,200
Direct costs
Direct material 7,500
Direct labor 6,700
Shipping 1,700
Prepare Management Reports
Customer Margin Analysis
The second step is to incorporate Acme Auto Parts’
previously computed activity-based cost assignments.
Acme Auto
Parts
Sales $ 29,200
Direct costs
Direct material 7,500
Direct labor 6,700
Shipping 1,700
ABC cost assignments
Customer orders 5,424
Product design 3,040
Order size 2,912
Customer relations 1,540
Prepare Management Reports
Customer Margin Analysis
The third step is to compute Acme Auto Parts’ customer margin of
$384 by deducting all its direct and indirect costs from its sales.
Acme Auto Parts
Sales $ 29,200
Direct costs
Direct material $ 7,500
Direct labor 6,700
Shipping 1,700
Customer orders 5,424
Product design 3,040
Order size 2,912
Customer relations 1,540 28,816
Customer margin $ 384
Product Margins Computed Using the
Traditional Cost System
The first step in computing product margins is to
gather each product’s sales and direct cost data.
SureStarts LongLifes Total
Sales $ 31,300,000 $ 18,700,000 $ 50,000,000
Direct costs
Direct material 9,000,000 6,000,000 15,000,000
Direct labor 7,000,000 5,000,000 12,000,000
Product Margins Computed Using the
Traditional Cost System
The second step in computing product margins
is to compute the plantwide overhead rate.
Manufacturing Overhead Costs at Baxter Battery
Production Department
Indirect factory wages $ 6,000,000
Factory equipment depreciation 3,500,000
Factory utilities 2,500,000
Factory building lease 2,000,000
Total manufacturing overhead $ 14,000,000
Plantwide manufacturing $14,000,000
= = $17.50 per machine-hour
overhead rate 800,000 MH
Machine-hours
SureStarts (800,000 @ 0.60 hours) 480,000
LongLifes (400,000 @ 0.80 hours) 320,000
Total machine-hours 800,000
Product Margins Computed Using the
Traditional Cost System
The third step in computing product margins is
allocate manufacturing overhead to each product.
Machine Overhead Overhead
Hours Rate Allocated
SureStarts 480,000 $ 17.50 $ 8,400,000
LongLifes 320,000 17.50 5,600,000
Total overhead allocated to products $ 14,000,000
480,000 hours × $17.50 per hour = $8,400,000
Product Margins Computed Using the
Traditional Cost System
The fourth step is to actually
compute the product margins.
SureStarts LongLifes Total
Sales $ 31,300,000 $ 18,700,000 $ 50,000,000
Cost of goods sold
Direct materials $ 9,000,000 $ 6,000,000 $ 15,000,000
Direct labor 7,000,000 5,000,000 12,000,000
Manufacturing overhead 8,400,000 24,400,000 5,600,000 16,600,000 14,000,000 41,000,000
Product margin $ 6,900,000 2,100,000 9,000,000
Selling and administrative 11,000,000
Nett operating
operating income
loss $ (2,000,000)
Shipping expenses $ 3,000,000
Marketing expenses 2,000,000
General administrative expenses 6,000,000
$ 11,000,000
Differences Between ABC and
Traditional Product Costs
SureStarts LongLifes
Product margins – traditional $ 6,900,000 $ 2,100,000
Product margins – ABC 8,372,000 (1,132,000)
Change in reported margins $ 1,472,000 $ (3,232,000)
The traditional cost The traditional cost
system overcosts the system undercosts the
SureStarts and reports LongLifes and reports
a lower product a higher product
margin for this product. margin for this product.
Differences Between ABC and
Traditional Product Costs
There are three reasons why the
reported product margins for the two
costing systems differ from one another.
Traditional costing allocates all manufacturing
overhead to products. ABC costing only assigns
manufacturing overhead costs consumed by
products to those products.
Differences Between ABC and
Traditional Product Costs
There are three reasons why the
reported product margins for the two
costing systems differ from one another.
Traditional costing allocates all manufacturing
overhead costs using a volume-related allocation
base. ABC costing also uses non-volume related
allocation bases.
Differences Between ABC and
Traditional Product Costs
There are three reasons why the
reported product margins for the two
costing systems differ from one another.
Traditional costing disregards selling and
administrative expenses because they are
assumed to be period expenses. ABC costing
directly traces shipping costs to products and
includes nonmanufacturing overhead costs caused
by products in the activity cost pools that are
assigned to products.
ABC versus Simple Costing
Schemes
• ABC is generally perceived to produce
superior costing figures due to the use of
multiple drivers across multiple levels
• ABC is only as good as the drivers selected,
and their actual relationship to costs. Poorly
chosen drivers will produce inaccurate costs,
even with ABC
Signals that Suggest that ABC
Implementation Could Help a Firm:
• Significant overhead costs allocated using one or two
cost pools
• Most or all overhead is considered unit-level
• Products that consume different amounts of resources
• Products that a firm should successfully make and
sell consistently show small profits
• Operations staff disagreeing with accounting over
manufacturing and marketing costs
ABC and Service / Merchandising
Firms
• ABC implementation is widespread in a variety of
applications outside manufacturing, including:
Health Care
Banking
Telecommunications
Retailing
Transportation
ABC Limitations
Substantial resources Resistance to
required to implement unfamiliar numbers
and maintain. and reports.
Desire to fully Potential
allocate all costs misinterpretation of
to products. unfamiliar numbers.
Does not conform to
GAAP. Two costing
systems may be needed.
