The first thirty days of an interim CFO engagement
A business that needs an interim finance executive is rarely calling because things are calm. The CFO has resigned, a sponsor has just closed, an integration is running, or a reporting deadline is closer than the numbers are ready for. The instinct in that situation is to ask the new person to start fixing things on day one. That is usually the wrong instruction.
The first week is assessment, not repair
Before anything gets changed, the function has to be described honestly: process, systems, organization and the handful of places where all three fail at once. On a finance and accounting function assessment at a $17B integrated steel producer, that exercise produced $25M+ in efficiency gains identified, with roughly 30% of manual work and cycle time identified for removal.
The word doing the work in that sentence is identified. Nothing had been delivered at that point. The distinction matters more than it sounds, because an assessment that quietly reports identified savings as achieved savings poisons every forecast that follows it.
What gets read in the first week is short and unglamorous: the close calendar and where it actually breaks, the forecast and its variance history rather than its current version, the thirteen-week cash view and who owns it, open audit findings, and the organization chart mapped against the work instead of the titles.
What not to touch
Three things can wait. Do not restructure the team in the first month, because the person who looks like the problem is often the only one holding a broken process together. Do not change the system, because a system change during a leadership gap converts one problem into two. And do not rewrite the reporting pack before finding out who reads it and which number they act on.
The order of operations
Close and controls come before forecasting, and forecasting comes before the long-range plan. Running that sequence at a $3B+ North American subsidiary of an automotive tire manufacturer produced a close 20-30% faster and forecast accuracy within plus or minus 5%, and it surfaced $150M+ in working-capital opportunities identified along the way. At a $2B PE-backed building products business, the same order produced forecast variance to actuals within plus or minus 3% and audit findings down roughly 30%.
Neither result came from a new system. Both came from fixing the sequence, naming an owner for each step, and refusing to forecast on top of a close nobody trusted.
Documented so it survives the handover
An interim engagement that leaves with the interim has failed, whatever the results looked like in month six. Engagements are typically 3-12 months, on-site or hybrid, which means the deliverable is not only the improved close or the tighter forecast but the documented process, the named owners and the calendar that lets a permanent CFO walk in and keep going.
That is also the honest test of the first thirty days. If the assessment was accurate, the sequence was right and the ownership was written down, month twelve is a handover. If the first month was spent fixing whatever was loudest, month twelve is a renewal request.
Related: Interim Finance Executive / CFO engagements.
Further reading: Why value-creation plans die between the deal team and FP&A and Decision rights before systems: what Day 1 readiness actually requires. Engagement records behind this article: finance function assessment, integrated steel producer, finance transformation, automotive tire manufacturer and chief of staff to the CFO, building products.
By Chad Barber, CFA, CPA — Managing Director, Finance, Strategy & Operations, CDB Advisory Services. Published by CDB Advisory Services, July 30, 2026.
Original analysis by the author, drawn from his own engagements. Clients are described by size and industry only, in keeping with confidentiality obligations. No third-party content is reproduced. © 2026 CDB Advisory Services. All rights reserved.