Internal Controls for Growing Businesses

As a business grows, its internal controls must grow with it, and the failure to keep controls aligned with growth is one of the most common and most costly weaknesses in growing businesses. A small business can often function with informal controls — the oversight that comes naturally when a few people know everything that happens — but as the business grows in size, volume and complexity, these informal controls become inadequate, and the business needs more deliberate, structured controls to manage the risks that growth creates. A growing business that strengthens its controls in step with its growth stays protected; one that lets its controls lag behind its growth becomes increasingly exposed, often without realising it until a problem reveals the gap. For the finance professional in a growing business, building controls that scale with the business is a genuinely important responsibility.

This guide is written for finance professionals and leaders in growing businesses who need to build internal controls appropriate to a business that is scaling. It covers why controls must grow with the business, how the control needs change as a business grows, the controls a growing business particularly needs, how to build controls that scale, and the common control failures of growing businesses. It complements our guidance on designing financial controls, with a specific focus on the challenges of a growing business. The aim is the practical understanding a finance professional needs to build and maintain internal controls that protect a growing business as it scales, which is one of the more important and more often neglected aspects of managing finance through growth.

Why Controls Must Grow With the Business

Internal controls must grow with the business because the risks they manage grow with it, and controls that were adequate for a smaller business become inadequate as the business grows. A small business often manages its risks through informal means — the owner or a few key people overseeing everything, knowing the transactions, and catching problems through their close involvement — which works when the business is small enough for this informal oversight to cover it. But as the business grows, this informal oversight cannot scale: the volume of transactions outstrips what informal oversight can cover, the business becomes too large for a few people to know everything, and the processes become too complex for informal control. The informal controls that protected the small business no longer protect the larger one.

This means that a growing business must replace its informal controls with more deliberate, structured ones as it grows, building the controls that can manage the risks of a larger, more complex business. A business that fails to do this — that grows while relying on the informal controls of its smaller days — becomes increasingly exposed, because its controls no longer match its risks. The exposure often goes unnoticed until a problem — an error, a fraud, a failure — reveals the gap, by which point the damage is done. Understanding why controls must grow with the business — that the informal controls of a small business cannot scale and must be replaced with deliberate ones as the business grows — is the foundation of keeping a growing business protected. The need to strengthen controls in step with growth is one of the most important and most neglected aspects of managing a growing business, and recognising it is the basis for addressing it.

How Control Needs Change as a Business Grows

The control needs of a business change in recognisable ways as it grows, and understanding the changes helps the finance professional anticipate what the business needs. As the volume of transactions grows, the business needs controls that can manage the volume — controls embedded in the systems and processes rather than relying on individual oversight, because individual oversight cannot cover high volume. As the business grows beyond the point where a few people know everything, it needs controls that do not depend on that informal knowledge — structured controls, segregation of duties, defined processes — because the informal oversight no longer covers the business. And as the business becomes more complex — more people, more processes, more locations or entities — it needs controls that manage the complexity.

The growth also creates new risks that the controls must address. As the business hires more people and delegates more, the risks of error and fraud across a larger workforce grow, requiring the controls — particularly segregation of duties and authorisation frameworks — that manage these risks. As the business handles more money and more assets, the controls protecting them become more important. As the processes grow more complex, the controls ensuring they operate correctly become more necessary. The finance professional should anticipate how the control needs change as the business grows — from informal to structured, from individual oversight to embedded controls, addressing the new risks that growth creates — and strengthen the controls accordingly. Understanding how the control needs evolve with growth is the basis for keeping the controls aligned with the business, which is what protects a growing business as it scales. The controls must evolve as the business does, and anticipating that evolution is part of managing growth well.

The Controls a Growing Business Particularly Needs

Certain controls become particularly important as a business grows, and a growing business should ensure it has these in place. Segregation of duties becomes essential as the business grows beyond the point where one person can be trusted to handle a process end to end without oversight — ensuring that no single person controls a process in a way that would allow them to commit and conceal an error or fraud, particularly in the high-risk areas like payments. A small business may not have the people for full segregation, but as it grows it should build segregation into its key processes, because the informal oversight that compensated for its absence no longer suffices.

An authorisation framework becomes important as the business grows and delegates — defining who can commit the business to what, and enforcing it — because the informal control of the owner approving everything cannot scale, and the business needs a structured framework for authorisation as it delegates. Controls over the key processes, particularly payments and the handling of money, become more important as the volume and the value grow. And the reconciliations and checks that catch errors become more necessary as the volume outstrips informal oversight. These controls — segregation of duties, authorisation frameworks, controls over key processes, reconciliations and checks — are the core of what a growing business particularly needs as it scales beyond informal control. The finance professional who builds these into the growing business keeps it protected; one who neglects them leaves the business exposed as it grows. Building the controls a growing business particularly needs is the substance of keeping it protected through growth, and it draws on the broader control design covered in our guide on designing financial controls that actually work.

Building Controls That Scale

Building controls that scale with the business means designing them to grow with the business rather than building controls that will themselves be outgrown, and the finance professional should approach control-building with scalability in mind. Controls that scale are typically those embedded in the systems and processes rather than dependent on individual effort, because embedded controls can handle growing volume while individual-effort controls cannot. As a business grows, building controls into its systems — the authorisation workflows, the validation, the segregation enforced by the system — provides control that scales with the volume, whereas controls dependent on individual oversight or manual effort do not scale and become a bottleneck or a gap as the business grows.

Building scalable controls also means anticipating the growth and building controls ahead of it rather than after the business has outgrown its existing controls, because controls built reactively after a problem reveals the gap arrive too late. The finance professional who anticipates the business’s growth and strengthens the controls ahead of it keeps the business protected as it grows; one who waits until the controls are visibly inadequate leaves a window of exposure. Building scalable controls also means designing them proportionately — strong enough to manage the risks but not so burdensome that they impede the business, because controls that impose too much friction on a growing business may be circumvented or may slow the growth. The finance professional who builds controls that scale — embedded in the systems, anticipating the growth, proportionate to the risks — keeps the growing business protected without impeding it; one who builds controls that are outgrown, or that arrive too late, or that impose too much friction, serves the business less well. Building controls that scale is what keeps a growing business protected as it grows, which is the goal.

The Common Control Failures of Growing Businesses

Growing businesses fail at controls in recognisable ways, and a finance professional who knows the common failures can guard against them. The most fundamental is the failure to strengthen controls in step with growth — the business growing while relying on the informal controls of its smaller days, so that the controls fall progressively behind the risks. The remedy is anticipating the growth and strengthening the controls in step with it. A second common failure is the lack of segregation of duties — the business growing beyond the point where informal oversight suffices without building the segregation that a larger business needs, leaving it exposed to error and fraud. The remedy is building segregation into the key processes as the business grows.

A third failure is the inadequate authorisation framework — the business delegating as it grows without the structured authorisation that delegation requires, leaving unclear or uncontrolled commitment of the business. The remedy is building the authorisation framework. A fourth is the reliance on key individuals — controls that depend on particular people’s knowledge or oversight, which fails as the business grows beyond what those individuals can cover and which creates risk if they leave. The remedy is structured, embedded controls that do not depend on individuals. And a fifth is the failure to notice the growing exposure until a problem reveals it, because the inadequacy of the controls is not visible until something goes wrong. The remedy is the deliberate, anticipatory attention to controls that catches the gap before the problem does. The finance professional who guards against these failures — strengthening controls with growth, building segregation and authorisation, avoiding reliance on individuals, attending to controls proactively — keeps the growing business protected; one who falls into them leaves it exposed as it grows. Avoiding the common control failures of growing businesses is much of what protecting a growing business requires, and it is one of the more valuable, if less visible, things a finance professional does for a scaling business.

Controls Through Specific Growth Transitions

Certain growth transitions are particularly testing for a business’s controls, and a finance professional should give them particular attention. Rapid growth is one of the most testing, because the business can outgrow its controls faster than anyone notices, the volume and complexity increasing quickly while the controls lag, creating a window of exposure that rapid growth widens. A business growing rapidly should pay particular attention to keeping its controls ahead of the growth, because the speed of the growth makes the controls more likely to fall behind. Acquisitions and the integration of new operations are another testing transition, bringing new processes, people and risks that the controls must extend to cover, often quickly.

The transition from owner-managed informality to delegated management is a particularly important one, because it is the point at which the informal controls of the owner-overseen business must give way to the structured controls of a delegated organisation. A business making this transition — growing beyond the point where the owner can oversee everything — must build the structured controls that replace the owner’s informal oversight, and failing to do so at this transition is a common and serious control failure. The finance professional should recognise these testing transitions — rapid growth, acquisitions, the move from owner oversight to delegation — and give the controls particular attention through them, because these are the points at which a growing business’s controls are most likely to fall behind its risks. Attending to controls through the specific testing transitions is part of keeping a growing business protected, and it is where the failure to strengthen controls in step with growth most commonly and most damagingly occurs.