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Time-Driven Activity-Based Costing

18 Pages Posted: 14 Jan 2004  

Robert S. Kaplan

Harvard Business School

Steven R. Anderson

Acorn Systems, Inc.

Date Written: November 2003

Abstract

The traditional ABC model has been difficult for many organizations to implement because of the high costs incurred to interview and survey people for the initial ABC model, the use of subjective and costly-to-validate time allocations, and the difficulty of maintaining and updating the model as (i) processes and resource spending change, (ii) new activities are added, and (iii) increases occur in the diversity and complexity of individual orders, channels and customers.

Time-driven ABC requires estimates of only two parameters: (1) the unit cost of supplying capacity and (2) the time required to perform a transaction or an activity. A time-driven ABC model:

- can be estimated and installed quickly
- is easily updated to reflect changes in processes, order variety, and resource costs
- can be data fed from transactional ERP and CRM systems
- can be validated by direct observation of the model's estimates of unit times
- can scale easily to handle millions of transactions while still delivering fast processing times and real-time reporting
- explicitly incorporates resource capacity and highlights unused resource capacity for management action
- exploits time equations that incorporate variation in orders and customer behavior without expanding model complexity

The paper uses simple numerical examples to articulate the fundamentals of time-driven ABC and provides several examples of companies that have implemented the approach and enjoyed rapid and significant profit improvements.

Keywords: Activity based costing, customer profitability, management accounting, cost management

JEL Classification: M40, M46

Suggested Citation

Kaplan, Robert S. and Anderson, Steven R., Time-Driven Activity-Based Costing (November 2003). Available at SSRN: https://ssrn.com/abstract=485443 or http://dx.doi.org/10.2139/ssrn.485443

Robert S. Kaplan (Contact Author)

Harvard Business School ( email )

Soldiers Field
Accounting & Control
Boston, MA 02163
United States
617-495-6150 (Phone)
617-496-7363 (Fax)

Steven R. Anderson

Acorn Systems, Inc. ( email )

4150 Westheimer, Suite 300
Houston, NY 77027
United States

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