Interim controlling, for the three to six months the seat cannot be empty.
The controller left. Or the ERP is being replaced and the close is slipping. Or the board asked a question the current cost model cannot answer. Interim controlling puts a senior cost and profitability practitioner in the seat for a fixed term: running the close and the reporting that has to keep happening, and rebuilding the model underneath it, so the permanent hire inherits something that works instead of a folder of spreadsheets.
Interim controlling is a fixed-term engagement, typically three to six months, in which an experienced controller takes operational responsibility for a company's controlling or FP&A function. It covers the recurring work that cannot pause, meaning the monthly close, variance analysis, the budget and forecast cycle and board reporting, and in a transformation mandate it also rebuilds the cost model underneath, so that product, customer and channel profitability can actually be measured. Cost and Profitability Consulting runs the rebuild on Time-Driven Activity-Based Costing, deployed in CostCtrl, so what the interim leaves behind is a running system rather than a set of files.
Hold the function, and leave it better than you found it.
What it covers
- Monthly close, variance analysis and the management reporting pack
- Budget and rolling forecast cycles, with the assumptions written down
- A rebuilt cost model on TDABC time equations, not revenue-based allocation
- Product, customer and channel profitability that survives a board question
- Controlling through an ERP or reporting migration, so the numbers keep arriving
- Documentation and handover to the permanent hire or the standing team
What you get
- A senior practitioner productive in the first weeks, not ramping for six months
- A recruitment process you can run calmly, because the function is covered
- A cost model the next controller can extend rather than rebuild
- An end date agreed in writing before the start date
Deliverables
- A working TDABC cost model in CostCtrl, on your own data
- Whale curve, margin cascade and customer profitability, refreshed each period
- A documented close calendar and reporting pack your team can run
- A written handover note: what was built, what was assumed, what is still open
Two different problems. Picking the wrong one wastes a quarter.
They are often used as synonyms. They are not, and the difference is load and end date.
Interim controlling
- You are short a function, right now. The seat is empty or the work has outgrown who is in it.
- Close to full load, three to six months, with a fixed end date.
- Usually triggered by a departure, a system migration, a carve-out or a covenant conversation.
- Success is a functioning controlling team you no longer need us for.
Fractional profitability controller
- You never needed a full-time senior. You need the capability a few days a month, indefinitely.
- A monthly retainer rather than a fixed-term mandate.
- Usually a company below the size that justifies a senior controller's salary.
- Success is a model that stays current without a permanent hire.
Why the interim window opens, in this quarter's own words.
Every item below is something the company or the buyer put into the public record, with the link. None of these organisations is a client of ours, and nothing here should be read as implying otherwise. We cite them because they show, in their own published words, the moment a controlling function comes under load.
Announced the appointment of a new chief executive and guided full-year adjusted EBITDA to between GBP 15m and GBP 18m, citing higher logistics costs, production issues at its Feltre facility and sales deferred into the second half. A leadership change and a guidance reset in one announcement is the classic moment finance is asked to re-explain the cost base.
Source: company RNS via Investegate →Reported that it is targeting CHF 25m of cost base reduction by the end of 2026 through consolidation of sites in Europe and overseas, with an interim group leader in place. A cost programme and an interim leadership arrangement, running at the same time, in the same company.
Source: ad-hoc-news →Stated in its half-year report that its programme aims for a permanent cost-base reset of approximately EUR 50m while mitigating the cost burden from the Tech Services divestment and reducing overcapacity, primarily in the consulting business. A permanent reset is a modelling problem before it is a cutting problem, and someone has to hold the model while it is built.
Source: company release via Cision →Reported H1 2026 results confirming that its Beyond Excellence efficiency programme had delivered EUR 112m of accumulated savings, 93 per cent of the three-year objective, and that the target has been raised to EUR 120m. Programme accounting at that level of precision is a standing controlling workload, not a one-off exercise.
Source: Estrategias de Inversión →Posted a Controller Financeiro vacancy in Braga whose first listed task is to design and implement a product costing system with clear identification of margins and cost drivers. The model does not exist yet, and the company is looking for one person to both build it and run it.
Source: Net-Empregos advertisement →Through Juan Luna S.L.U., posted a vacancy in Sollana, Valencia for a Controller de Costes Logísticos covering logistics cost budgeting, variance analysis, and route and centre profitability. Route and centre profitability is a cost-to-serve model. It is being scoped as a job description.
Source: InfoJobs advertisement →Sourcing note, because it matters more than the numbers. Four of the six items above come from a company release or an official filing channel; the Komax and Acerinox items come from financial press coverage of the company's own reporting. We link what we read. Where a figure is a company's own published statement we say so, and where it is not, we do not present it as one.
Evidence cut-off 3 Aug 2026Published 6 Aug 2026Next review 3 Feb 2027TDABC for the model, CostCtrl for the machinery, AI for the speed.
An interim mandate is short. What makes three to six months enough is not working faster by hand, it is not starting from a blank page.
TDABC
- Time-Driven Activity-Based Costing, formalised by Kaplan and Anderson in Harvard Business Review in 2004.
- Time equations instead of a forest of drivers, so the model is maintainable by the people who close the books.
- Capacity is modelled explicitly, so unused capacity shows up as unused capacity rather than being buried in unit cost.
CostCtrl
- Our costing platform. The model is built in it from the start, so there is no migration at handover.
- It runs from the exports your systems already produce. No integration project sits between you and a first result.
- Whale curve, margin cascade and multidimensional profitability come as outputs, not as a separate reporting build.
AI
- Used where it is genuinely faster: reading and reconciling messy financial data, drafting time equations from process descriptions, and stress-testing assumptions.
- Not used to invent numbers. Every figure in the model traces to an activity, a time and a rate.
- The published costing prompt library shows exactly how, including how to stop a model hallucinating.
Common questions
How quickly can an interim controller start?
Weeks, not months, and that is most of the point. The scoping conversation establishes the close calendar, the systems and the reporting obligations that cannot slip. What we do not do is arrive and spend the first month discovering the chart of accounts, because the diagnostic work runs in parallel with holding the function.
Do you replace our finance team or work with it?
Work with it. An interim mandate is usually a company whose finance team is capable and under-resourced, or whose senior seat is empty. The team stays and is trained on the model as it is built, because they are the ones who will run it after the end date.
What happens at the end of the mandate?
You hold a documented cost model in CostCtrl, a close calendar and reporting pack your team runs, and a written handover note listing what was built, what was assumed and what is still open. If you want a second pair of eyes afterwards, that is Advisory, and it is a separate and much smaller commitment.
Can you run controlling through an ERP migration?
Yes, and it is one of the more common reasons the window opens. The model is built on the exports the business produces rather than on a live system integration, which is precisely why it survives the migration: when the source system changes, the extract changes, and the model does not have to be rebuilt.
Is this the same as a fractional controller?
No. Interim is close to full load for a fixed term because you are short a function. Fractional is a few days a month, indefinitely, because you never needed a full-time senior. If the second description fits better, read the fractional profitability controller page instead.
Who would actually do the work?
A senior partner. Cost and Profitability Consulting was founded in Porto in 2010 and has built more than 150 cost models across more than 30 countries. Miguel Guimarães, the founding partner, has spent 25 or more years building cost and profitability models and leads the development of CostCtrl.
Find out what the interim would inherit. Start with a Profit Check.
No data upload. No sales call. Fourteen questions, twelve to fifteen minutes, and a personalised report scoring your organisation across the seven dimensions of a cost model that works. It is the same framework we use on day one of a mandate.
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. Lectured alongside Professor Robert S. Kaplan at the CFO conference in Amsterdam (2009).
Call +351 910 313 731
