What is TDABC and Why Does It Matter for Your Business?

Time-Driven Activity-Based Costing (TDABC) is a methodology developed by Robert S. Kaplan and Steven R. Anderson that fundamentally changed how organizations understand and manage their costs. Unlike traditional costing methods, TDABC uses time equations to assign resource costs to activities and cost objects, providing a clearer picture of profitability.

The Problem with Traditional Costing

Most businesses still rely on volume-based costing methods that allocate overhead costs using simple metrics like direct labor hours or machine hours. While easy to implement, these methods create significant distortions. A high-volume, straightforward product may subsidize a low-volume, complex one without anyone realizing it.

Activity-Based Costing (ABC) was developed to address these distortions, but it came with its own challenges: complex employee surveys, expensive maintenance, and difficulty scaling across an entire organization.

How TDABC Solves These Challenges

TDABC simplifies the process by requiring only two parameters for each resource group: the cost per time unit of supplying resource capacity, and the time required to perform each transaction or activity. This makes the model dramatically easier to build, maintain, and update.

Time equations capture the complexity of real-world operations. Instead of creating a separate activity for every possible variation, TDABC uses conditional logic within time equations to handle different scenarios. For example, a shipping department time equation might account for domestic vs. international orders, standard vs. expedited shipping, and special packaging requirements.

Benefits for SMEs

Small and medium enterprises benefit enormously from TDABC because it reveals which customers, products, and services are truly profitable and which are destroying value. With this insight, management can make informed decisions about pricing, process improvement, customer portfolio management, and resource allocation.

At Cost and Profitability Consulting, we have implemented TDABC models across diverse industries including logistics, healthcare, ports, and financial services. The results consistently show that 20-30% of customers or products generate more than 100% of profits, while the remaining ones erode that value.

Getting Started

Implementing TDABC does not require expensive software or a massive consulting engagement. With the right methodology and tools like CostCTRL, organizations of any size can build and maintain a TDABC model that delivers actionable profitability insights.