TDABC software runs time-equation cost models that spreadsheets and ERP modules cannot maintain at scale. We have built TDABC models in all three environments for 15 years – this page is the comparison we wish clients had read before calling us. It ends with why we built our own platform, CostCtrl.
What TDABC actually demands from software
Time-driven activity-based costing is computationally simple but operationally demanding. Whatever tool you choose has to:
- Evaluate time equations per transaction – every order, shipment or case gets its own cost, not an average;
- Recalculate continuously – a cost model that updates quarterly is a historical document;
- Track capacity – TDABC’s signature output is the cost of unused capacity, which means the tool must know theoretical vs. practical capacity per resource;
- Run scenarios – “what if we consolidated deliveries?” should take minutes, not a re-implementation;
- Stay legible – controllers must be able to trace any number back to its drivers, or trust dies.
The three realistic options
| Spreadsheet | ERP costing module | Purpose-built (CostCtrl) | |
|---|---|---|---|
| Time equations | Manual formulas; fragile beyond ~2 cost pools | Rarely supported – most modules allocate by rates | Native – the core engine |
| Refresh cycle | Manual, monthly at best | With the close (monthly) | Every transaction, every night |
| Idle capacity | Possible, rarely done | Usually invisible | Explicit per resource |
| Scenarios | Copy of the file (then chaos) | Limited | Side-by-side simulation |
| Whale curve / treemaps | Hand-built charts | No | Built-in |
| Who maintains it | The one analyst who built it | IT + consultants | Your controllers, certified |
| Honest verdict | Right for pilots and small scopes | Right if you only need standard costing | Right when complexity drives your cost |
The honest part: a spreadsheet is the correct tool for a first TDABC pilot – one department, two or three cost pools, quarterly refresh. We build pilots that way ourselves. It stops being the right tool the day the model needs to survive its author.
Why we built CostCtrl
After a decade of building TDABC models in clients’ spreadsheets and BI stacks, the failure pattern was always the same: the model was right and the operating of the model was wrong – refreshes slipped, capacity data went stale, the analyst left. CostCtrl is our answer: a SaaS platform purpose-built for TDABC, not a generic BI tool with costing dashboards.
- Time-equation engine: every transaction costed nightly against practical capacity;
- Multidimensional treemaps and whale curves as first-class views, not exports;
- Scenario simulation: reprice, re-route, consolidate – compared side by side before you commit;
- AI narration: the model explains itself in plain language – what moved, why, and what to look at next;
- SAF-T and ERP connectors for fast data onboarding in European deployments.
Software without method is a faster way to be wrong
One warning from 150+ implementations: tooling is the second decision, not the first. A TDABC platform fed by a badly designed model produces beautiful, precise, wrong numbers every night. That is why CostCtrl deployments ship with model design and team certification – the consulting method and the software are one product.
Frequently asked questions
Can I run TDABC in Excel?
Yes – and for a pilot you should. Up to roughly two or three cost pools and a quarterly refresh, a spreadsheet works. Beyond that, maintenance costs explode and the model becomes hostage to its author. That is the point to move to a platform.
Doesn’t our ERP already do this?
ERP costing modules do standard costing and rate-based allocation well. Very few evaluate time equations per transaction or make idle capacity visible – the two things that define TDABC. Check those two features specifically before assuming coverage.
What is CostCtrl?
CostCtrl is our SaaS platform purpose-built for TDABC profitability modelling: a time-equation engine, treemaps, whale curves, scenario simulation and AI narration. It is developed by Cost & Profitability and deployed with model design and team certification included.
How long until a live model?
After the three-week diagnostic, a typical CostCtrl deployment takes 4 to 8 weeks to a nightly-recalculated model, depending on data readiness – SAF-T and standard ERP exports shorten it considerably.
See CostCtrl on your own data
Book a demo with your data, or start with the free Profit Check to see if you’re ready for a platform at all.