Line authority versus advisory position
The structural difference is accountability. An interim executive sits in the line: they hold the budget, manage the team, make the calls and answer for the results while they are in post. A consultancy sits beside the line: it analyses, recommends and often helps deliver, but the decisions and their consequences remain with your executives. Everything else that distinguishes the two routes, from cost shape to cultural impact to what remains afterwards, flows from that one difference in where authority sits.
What an interim executive brings
Immediate, senior, single-point ownership. A good interim has already run the function, often several times, and arrives without the ambitions that make permanent hires cautious: no career to protect internally, no incentive to defer hard calls. They make unpopular decisions at a speed permanent executives rarely can, precisely because they leave when the assignment ends. The team gets a leader rather than an observer, day one. And because interims work inside the organisation rather than on it, the changes they make tend to be embedded in people and process rather than in a document.
What a consultancy brings
Capacity, method and comparative evidence, in parallel. One interim is one person; a consultancy fields a team that can analyse a portfolio, run workstreams simultaneously and draw on specialists as the work uncovers what it uncovers. Its recommendations arrive with cross-client pattern knowledge one individual's career cannot span. A consultancy also survives scrutiny differently: a documented method and an institutional name behind a controversial recommendation can matter in board and investor settings. And when the problem is genuinely analytical rather than managerial, a team beats a chair.
The two routes compared
| Dimension |
Interim executive |
Consultancy |
| Accountability |
In the line; owns outcomes in post |
Advisory; outcomes stay with your executives |
| Capacity |
One senior person |
A scalable team plus specialists |
| Speed to impact |
Days; decisions start immediately |
Weeks of diagnostic before recommendations |
| Knowledge afterwards |
Embedded in the team they led |
Leaves with the engagement unless transferred |
| Cost shape |
Day rate, one person, months |
Team fees, defined scope, extensions likely |
| Cultural footprint |
Leads from inside the structure |
Works alongside it, sometimes resented |
| Best matched gap |
A vacant or failing seat |
A question needing analysis and design |
When each route clearly fits
Choose the interim when a seat is empty or failing and the cost of an unmanaged function compounds weekly, when a turnaround needs decisions made rather than options tabled, or when a defined change (an integration, a carve-out, a function rebuild) needs running by someone who has done it before. Choose the consultancy when the question is what to do rather than who will do it, when the work spans more ground than one person can cover, or when the organisation needs analysis it can hand to a board or buyer with an institution's weight behind it.
The blended routes
- An interim to lead, a small consulting team to analyse: authority and capacity paired under the interim's direction rather than in parallel hierarchies.
- Consultancy diagnostic first, interim to execute: the strategy is designed with breadth, then delivered by someone accountable inside the line.
- An interim with an independent challenge layer: structured external perspectives on the big calls, without a full consulting engagement around them.
- Interim as bridge during a search, with a narrow consulting project reserved for the one analytical question the interim cannot cover alone.
Questions that decide it for your gap
- Is the gap a missing decision-maker or a missing answer?
- Who will own the outcome in twelve months, and which route leaves them stronger?
- Can one exceptional person actually cover this, or are we compressing three problems into one job description?
- What must stay confidential, and how many external people does each route bring inside it?
- If this runs eighteen months instead of six, which cost model and which dependency would we rather hold?
