Time-Driven Activity-Based Costing is not for everyone, and it is not for every moment in a company’s life. Some businesses are simply too small or too uniform to justify it. Others need it urgently and do not know it yet. After building TDABC models across manufacturing, healthcare, logistics and professional services, we see the same pattern: the companies that get the most value share three recognisable signs. Here is how to know if yours is one of them.
Sign 1: Your P&L looks healthy, but nobody can say where the profit comes from
This is the most common trigger. Revenue is growing, the overall margin is acceptable, and yet the leadership team cannot answer a basic question: which products, services or customers actually generate that profit, and which ones quietly consume it?
If your answer to “what is our margin on client X?” starts with “it depends on how you allocate…”, you have visibility built on averages. Averages hide cross-subsidies. In almost every model we build, 20 to 30 percent of the portfolio turns out to be unprofitable once real resource consumption is measured, and a small group of products or clients is funding the rest. You cannot manage what you cannot see, and an aggregate P&L shows you almost nothing.
Sign 2: Your prices rest on cost figures nobody fully trusts
The second sign shows up in pricing meetings. Someone proposes a discount, someone else objects, and the discussion turns into a debate about whether the cost number on the spreadsheet is even right. Overheads spread as a flat percentage of revenue or direct labour, allocation keys that have not been revisited in years, and complexity that grew faster than the costing logic behind it.
When cost data is not trusted, pricing becomes negotiation theatre. Commercial teams push for volume, finance pushes back with numbers nobody believes, and decisions default to gut feel. TDABC replaces that debate with a simple, auditable logic: what capacity does each product or client consume, and what does that capacity cost per unit of time? Once the number is credible, the pricing conversation changes completely.
Sign 3: Your team argues about costs instead of acting on them
The third sign is organisational. Operations has one version of costs, finance has another, and sales has a third one built in a spreadsheet three years ago. Every management meeting spends its first thirty minutes reconciling numbers instead of deciding anything.
This is not a data problem. It is a model problem. Without a single agreed logic for how resources flow to products and customers, every department builds its own truth. A TDABC model, kept simple and updated on a defined cadence, becomes the shared reference. The argument stops being “whose number is right?” and becomes “what do we do about the clients we now know are losing money?”. That shift is worth more than the model itself.
What readiness does not require
Many companies postpone TDABC because they imagine prerequisites that do not exist. You do not need perfect data: a standard export from your ERP or billing system, headcount by department and a payroll summary are enough to start. You do not need a new IT project: a first model covering your top cost pools and main product families can be built in weeks, not months. And you do not need a large team: one motivated controller with management backing is a better starting point than a committee of ten.
What you do need is honesty about the three signs above. If none of them apply, a simpler costing approach may serve you well for now. If two or three sound familiar, the cost of not knowing is already higher than the cost of the model.
Where to start
Start small and start with a diagnosis, not with software. Our free Profitability Health Check takes a few minutes and shows you where your costing practice stands across seven dimensions, from cost allocation to data and technology. It is the fastest way to turn “I think we have a problem” into a concrete starting point.
And if you want to learn the method hands-on, building a real model step by step, join one of our TDABC workshops. Participants leave with a working model structure they can apply to their own business the following week. The readiness signs are usually clearer from the inside of a model than from the outside.