- The founder-approves-everything model breaks somewhere around thirty to fifty people.
- Cost centres become necessary the moment more than one person owns a budget.
- Delegated administration is what stops finance becoming a ticket queue.
- A documented close calendar matters more than any individual tool.
- Policy should be rewritten, not extended, when headcount doubles.
What breaks, and roughly when
Finance operations fail in a recognisable order. Knowing the sequence lets you fix things one step ahead rather than one step behind.
Predictable breakpoints
| Around | What stops working | The standard fix |
|---|---|---|
| 15–25 people | Founder reviewing every transaction | Per-card limits and an approval threshold |
| 25–50 people | One shared budget | Cost centres with named owners |
| 40–80 people | Finance issuing every card by request | Role templates and delegated administration |
| 60–120 people | Ad-hoc close | A documented close calendar with owners and dates |
| 100–200 people | Policy as folklore | A short written policy enforced by the system |
Cost centres and budget ownership
A cost centre is only useful if a named person is accountable for it and can see the spend without asking finance. Otherwise it is a reporting dimension that produces reports nobody acts on.
The transition worth planning for is the one where budget owners stop asking finance “what have we spent?” and start being asked “why did you spend it?”.
- Every cost centre has one accountable owner, not a committee.
- Owners see committed spend, not just settled transactions.
- The structure mirrors the accounting system exactly, with no translation layer.
- Reallocation between centres has a defined process, however lightweight.
Designing approvals that do not clog
The instinct when a company grows is to add approval steps. In practice this reliably produces rubber-stamping: an approver receiving forty requests a week reads none of them carefully.
Better designs route fewer things to fewer people, with enough context to make a real decision, and rely on after-the-fact review for everything else.
- Set thresholds per cost centre rather than a single company-wide number.
- Always route new vendor relationships, even small ones.
- Give each approver a target volume — if it exceeds a handful a week, the threshold is wrong.
- Measure approval latency and treat slowness as a design defect.
The close calendar
At twenty people, close is a task. At a hundred and fifty, it is a coordinated process with dependencies, and it needs to be written down: what happens on which working day, who owns it, and what blocks the next step.
The most common cause of a slow close is not accounting complexity — it is documentation arriving late, which is a card programme configuration problem rather than an accounting one.
Use our month-end close checklist as a starting structure.
Frequently asked questions
As soon as more than one person owns a budget — commonly between twenty-five and fifty employees. Retrofitting cost centres onto a year of uncategorised history is significantly more work than starting them early.
Usually one, occasionally two for large amounts. Three or more levels almost always means every level trusts the others to have read it properly, and nobody has.
Delegated administration within a finance-set ceiling works well and removes finance from the critical path of onboarding. It requires that role templates already exist so delegation does not mean improvisation.
Most companies bring in controllership — full-time or fractional — somewhere between fifty and a hundred and fifty people, usually triggered by audit requirements, revenue complexity or investor reporting rather than headcount alone.
Keep reading
Sources and further reading
Every factual statement on this page is checked against primary documentation. Terms change frequently, so confirm details with the provider before acting on them.
- Brex — official website Primary source for current product names, availability and terms.
- FASB Accounting Standards Codification Reference point for accrual, expense recognition and close-process statements.
- IRS Publication 463 — travel, gift and car expenses Used for statements about expense substantiation and record keeping in the United States.