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CFO, Treasurer, and Controller are three distinct finance roles that often blur in mid-market companies. The CFO sets financial strategy and owns overall direction, the Treasurer manages liquidity and financial risk, and the Controller ensures accuracy and compliance. Understanding where each role begins and ends is critical for companies scaling past £20–50M revenue or expanding internationally.
Picture a 150-person company where a single person signs off on bank mandates, approves payments, and reviews the monthly close. It works until it doesn't. In smaller organisations, these three roles frequently overlap or collapse entirely into a single "Head of Finance” but resilience, regulation and risk management not only demand segregation of duties, but it simply becomes too much when a company grows from a start-up to a scale-up.
Why These Three Finance Roles Are So Often Confused
At the very outset of a start-up or with a micro-business, a single person or two people in finance makes sense. At the smallest scale the core role is often a single bookkeeper or finance manager handling everything from transaction processing to basic reporting, with roles only beginning to separate as revenue grows.
The challenge starts when the business scales, typically past the £2 to 50M revenue mark or into multi-entity structures. At that point, the distinctions stop being academic and start having operational consequences: missed FX exposures, approval bottlenecks, reconciliation gaps that widen close cycles. As the Association of Corporate Treasurers (ACT) notes, the treasurer "may be a separately identifiable role or part of the responsibilities of a broader role depending on the size and complexity of the organisation."
Here's a useful framing to remember:
The CFO asks should we? The Treasurer asks how do we? The Controller asks did we?
What is a CFO? A person with strategic authority over the entire finance function
The CFO (Chief Financial Officer) has the broadest remit of the three functions, providing strategic direction and leadership across the entire finance function. The CFO sets the policy framework within which both the Treasurer and Controller operate, taking a leading role in business strategy formulation and stakeholder management.
The role expanded with a shift from principally historically based cost control to growth optimisation, with the CFO taking a leading role in business strategy formulation and stakeholder management.
In mid-market companies, the CFO often acts as de facto Treasurer, signing off on treasury policy directly. Most treasurers report liquidity risk management as a critical board or CFO mandate, which tells you that treasury operates within a CFO-set framework.
Core CFO responsibilities
The CFO is responsible for financial strategy, forecasting and long-term planning. Their function owns capital structure decisions and capital allocation, manage external financing including debt and equity, and oversee board and investor reporting. They also set the organisation's risk appetite, evaluate M&A and major investment decisions, and own the FP&A function.
When do companies typically hire a dedicated CFO?
Common triggers include Series B/C raises in venture-backed companies, hitting the £20 to 50M revenue threshold in owner-managed businesses, international expansion requiring multi-currency reporting, or new regulatory obligations such as public listing or debt covenants, although this can start much earlier with a series A raise or companies operating in the financial services sector. Strategic responsibilities increase as businesses grow, eventually requiring a dedicated senior finance leader. At this stage, the generic "Head of Finance" title typically formalises into the CFO designation, reflecting the strategic weight of the role.
What is a corporate treasurer? Responsible for liquidity, cash, and financial risk
Where the CFO decides direction, the Treasurer executes within it. The treasurer's role centres on managing the money (the “treasury”) and associated financial risks in a business, provided there is no dedicated financial risk-management function, ensuring the business has the capital it needs to operate day to day.
The key distinction from the management accountant or “controller” is time horizon: the Treasurer is forward-looking (what will our cash position be in 30/60/90 days?), whilst the management accountant is typically backward-looking (what was our position last month?).
Treasurers "sit in the engine room," responsible for ensuring the institution has all the liquidity, capital, and debt funding it needs.
The treasurer role becomes particularly critical when a company operates across multiple banks, currencies or legal entities or if a company operates in the financial services sector where the primary business is concerned with financial flows like for example with payment service providers.
Modern treasury platforms help treasurers centralise cash flow forecasting and debt management across these increasingly complex structures, with these systems acting as assistants and the treasurer staying in control.
Core treasurer responsibilities
The treasurer is responsible for cash position monitoring and daily liquidity management. They handle short and medium-term cash flow forecasting, manage banking relationships, oversee payment operations and approval workflows, and identify and hedge FX exposure. The function also manages debt facilities and covenant compliance, handles intercompany funding and cash pooling, and implements treasury policy.
Treasurer vs CFO: where does the line fall in practice?
Here are three concrete decision scenarios:
- Deciding whether to raise a £5M revolving credit facility: CFO territory.
- Negotiating the terms and managing the drawdown: Treasurer takes over
- Reconciling the interest payments against the general ledger: Controlling.
What is a financial controller? Responsible for accuracy, compliance, and the close
The term “controller” has become a synonym for the management accounting function or the chief management accountant. This role owns financial reporting integrity: making sure the numbers are right, compliant and produced on time. They oversee all accounting functions in a business and ensure accounting records are appropriately kept.
Where the treasurer manages cash flows forward, a controller accounts for what already happened. They anchor operational accuracy and control, distinguishing between operational finance (bookkeeping, payroll, invoicing) and strategic finance (budgeting, forecasting).
In the UK, a compliance dimension may be in scope of the role. Every company must file annual accounts with Companies House. This obligation sits within directors' broader statutory responsibilities.However, in practice, the statutory accounts are typically prepared by the controller, who liaises with auditors, so the Board can review and safely sign them off.
Core controller responsibilities
The Controller is responsible for owning the month-end and year-end close. They prepare management accounts and the board pack, handle statutory accounts and audit support, and oversee AP and AR process management. The Controller often also manages or oversees the broader financial team in GL reconciliation and intercompany eliminations, coordinates VAT and tax filings, maintains internal controls and financial policies, and oversees ERP configuration and chart-of-accounts governance.
Controller vs Treasurer: who owns bank reconciliation?
According to the job description and how the department is constructed, this can vary. But functionally and practically, the treasurer owns the bank position and banking relationships (real-time cash, “treasury”); while the controller owns the accounting reconciliation (matching bank statements to the general ledger). In well-structured finance teams, these two functions work hand in hand; but any gaps are precisely where errors hide.
Automated bank reconciliation can assist in speeding this process up and surface potential errors earlier, built to empower the controller, with transactions auditable and the controller retaining ultimate oversight.
CFO vs Treasurer vs Controller: side-by-side comparison
These three roles form a system rather than a hierarchy of importance:
| Dimension | CFO | Treasurer | Controller |
|---|---|---|---|
| Primary focus | Strategic | Operational (cash & risk) | Accounting & compliance |
| Core question | Should we? | How do we? | Did we? |
| Time horizon | Long-term | Short-to-medium (30/60/90 days) | Historical (last period) |
| Key outputs | Board reports, strategy, capital plan | Cash forecasts, funding, hedges | Management & statutory accounts |
| Key relationships | Board, investors, CEO | Banks, lenders, rating agencies | Auditors, HMRC, internal stakeholders |
| Typical reporting line | Reports to CEO/board | Reports to CFO | Reports to CFO |
The CFO sets direction, the treasurer secures and moves the cash to execute it, and the controller ensures it all happened accurately and compliantly.
How does finance team structure evolve as companies scale?
Three broad stages typically emerge:
Stage 1: Sub £10M, single entity
One finance manager or bookkeeper covers transaction processing, invoicing, payroll, and basic reporting or it is entirely outsourced to an accountancy firm. All three "roles" live in one person.
Stage 2: £10 to 50M, multi-entity or international
A CFO and controller split emerges. AP/AR may become dedicated roles. Treasury responsibilities are often still absorbed by the CFO or the broader finance team.
Stage 3: £50M+, multiple currencies/banks/entities
Finance becomes highly specialised. All three senior roles become distinct, with treasury analysts and AP/AR teams reporting to the treasurer and controller respectively.
Efficiency matters throughout this journey: Well-defined role boundaries are a large part of how that efficiency gets won.
Getting the structure right: What happens when these role boundaries blur?
Blurred boundaries create quite predictable, recognisable failures:
- No dedicated treasurer: Cash flow forecasting gaps, late FX hedging and manual multi-bank reconciliation. Liquidity risk management is a treasury mandate in most organisations, so leaving it un-owned is a material exposure.
- No dedicated controller: Month-end close stretches to 10-15 days, audit preparation becomes chaotic and intercompany eliminations are run in spreadsheets, all of which run directly counter to the statutory-reporting rigour Companies House filing demands.
- CFO doing everything: Strategic thinking gets crowded out by operational execution, and board reporting turns reactive, the opposite of the value-creating, strategy-leading CFO the profession now expects.
Companies that scale their finance function well define these boundaries early and give each role the tools to execute without overlapping.
