Profitability forecasting

Forecast the margin, not just the revenue.

Profitability forecasting carries your real, attributed cost structure forward, so you project margin by customer, product and channel, instead of extrapolating the top line and hoping cost behaves.

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Cost and Profitability Consulting · TDABC since 2010 · CostCtrl platform

Same engine

the model that explains last year is the one that projects next year

Flat sales,

falling margin: a forecast that sees a mix shift a revenue line cannot

By dimension

project margin per customer, product, channel or plant, not one blended number

01The problem

A revenue forecast can rise while your margin quietly falls.

Most forecasts grow the top line and assume cost follows in a fixed ratio. But growth rarely arrives evenly. Win a wave of small, high-touch accounts and revenue climbs while margin sinks, because the cost to serve them was never in the ratio. A profitability forecast keeps real cost attached to each line, so a change in mix shows up as a change in margin, before it shows up in the results.

Illustrative. A flat history of margin, then a widening range of modelled outcomes: higher with deliberate re-pricing, flat if nothing changes.

02How we build it

Start from an attributed cost model.

Cost-to-serve already lands on each customer and product. The forecast inherits that logic rather than inventing a new one.

Project the drivers, not just the totals.

Volume, mix, price and cost-to-serve each move on their own. The forecast combines them, so the margin reacts the way the business actually does.

Show a range, not a single line.

Best case, base case, do-nothing. A forecast that admits uncertainty is one a board can actually plan against.

Hand you a model you re-run.

Each month actuals refresh the projection. The forecast stays alive instead of expiring the day it is presented.

03Where it connects

Forecasting is the forward-looking face of the same model behind cost-to-serve. One explains the past, this one projects the path.

See profit-driven budgeting →

04Frequently asked questions

Questions a CFO asks.

What is profitability forecasting?

Profitability forecasting projects future margin by carrying a real, attributed cost structure forward, rather than extrapolating revenue and applying a flat cost percentage. It tells you where margin is heading, by customer, product and channel, not just where sales are heading.

How is it different from a revenue forecast?

A revenue forecast projects the top line and usually assumes cost moves with it in a fixed ratio. A profitability forecast keeps the true cost-to-serve attached to each customer and product, so a shift in mix changes the margin even when revenue is flat.

Do we need a perfect cost model first?

You need a defensible one, not a perfect one. Once cost-to-serve is attributed at the transaction, the same model that explains last year becomes the engine that projects next year. The forecast inherits the model logic.

References

Sources

Canonical works behind this method. Each opens in a new tab.

Book
Forecasting: Principles and Practice (3rd ed.)Hyndman, R. J. & Athanasopoulos, G. (2021). OTexts.
Canonical open-access forecasting textbook on methods, evaluation and time-series models.
Book
Forecasting: Methods and Applications (3rd ed.)Makridakis, S., Wheelwright, S. C. & Hyndman, R. J. (1998). John Wiley & Sons.
Classic business forecasting reference on quantitative and judgmental methods.
Paper
Time-Driven Activity-Based CostingKaplan, R. S. & Anderson, S. R. (2004). Harvard Business Review 82(11).
The founding article defining TDABC and its two-parameter model.

Start with the Profit Check

Where is your margin actually heading?

The Profit Check gives you a first read in 10 minutes.

Take the Profit Check See the cost method behind it

Workshops

Bring the method into the room.

One working profitability model, built from real data, that you take home at the end.

Reserve a seat

Reviewed by

Miguel Guimarães

Founding Partner, Cost and Profitability Consulting

More than 150 Time-Driven ABC engagements across 11 sectors since 2010, working within the Kaplan and Anderson framework.

About the author →

Published 16 June 2026

Proof

A distributor in New Zealand. €1.335M of cost-to-serve made visible, then halved, and 830 loss-making customers brought down to 295.

Read the case study →

Who you would be talking to

Miguel Guimarães, Founding Partner

Cost and profitability practitioner for 25+ years. Presented the Damco cost-to-serve case at Managing for Profit (Amsterdam RAI, December 2009), on the same programme as Robert S. Kaplan.

Call +351 910 313 731