02 Mar 2026
For most organisations, expense policies are already in place. They are reviewed, signed off by finance and HR, and intended to bring clarity, fairness and cost control. On paper, they appear robust.
In practice, however, many businesses still struggle with unpredictable spend, inconsistent approvals and time-consuming disputes. Finance teams often find themselves resolving issues after the event, rather than preventing them in the first place.
It’s tempting to attribute these challenges to carelessness or bad intent. In reality, the root cause is usually more complex. Many expense policies are built on assumptions about behaviour that simply do not reflect how people make decisions in real working environments.
To understand why policies break down, we need to look beyond the wording of the document and consider the psychological and social dynamics that shape everyday decisions at work. That’s quite a hefty task, so we’ve parachuted in the aid of expense management software specialists to assist with exploring this topic further.
The gap between policy and reality
Most policies are written for an idealised employee: rational, attentive, well-rested and operating in a calm environment. They assume that staff will read the rules carefully, remember them and apply them consistently at the point of purchase.
That is rarely how decisions are made.
Expense choices often happen at the end of long days, between meetings or while travelling. Time is limited. Attention is stretched. By the time a claim is submitted, the decision has already been made, often quickly and with incomplete information.
Behavioural economists describe this as “bounded rationality”. When mental bandwidth is constrained, people do not optimise decisions. They simplify them. They rely on habit, prior approvals and social cues rather than consulting formal documentation.
From a governance perspective, this matters. Expense policies are not operating in isolation. They are competing with faster, more intuitive decision-making processes, and those processes usually win.
Ambiguity creates inconsistency
Many policies rely on terms such as “reasonable” or “appropriate”. While designed to offer flexibility, these words introduce ambiguity.
Ambiguity forces interpretation. And interpretation is shaped by context, culture and precedent, not just policy wording.
When boundaries are unclear, employees look for signals elsewhere: what their manager approved last time, what colleagues typically claim, or what seems acceptable within their team. Informal practice can quickly override formal guidance.
Over time, these unwritten norms become the real rules. Different teams develop different interpretations of the same policy, influenced by seniority, culture and past approvals.
For finance leaders, this fragmentation has tangible consequences. Inconsistent interpretation makes spending harder to forecast, harder to benchmark across departments and harder to challenge without appearing arbitrary. Disputes are not removed, they are simply pushed further down the process, after the money has already been spent.
Social pressures often outweigh financial rules
Expense decisions are rarely just financial calculations. They are tied to perceptions of professionalism, status and competence.
Choices about travel, accommodation and client hospitality carry social weight. In client-facing roles especially, employees may feel pressure to meet unspoken expectations about what is suitable for the occasion. Spending can become a way of signalling professionalism or representing the organisation appropriately.
Booking the lowest-cost option may feel prudent from a policy standpoint, but it can also feel misaligned with expectations in certain contexts. Upgrading travel or selecting a more premium venue may be framed as protecting the brand or strengthening relationships.
When policies do not acknowledge these social dynamics, employees are left balancing formal rules against informal expectations. In the moment, the risk of appearing unprofessional can feel more immediate than the abstract risk of breaching policy.
Research shows that a significant one in four employees admit to bending expense rules at some point. While deliberate misconduct does occur, it is often not the primary driver. More commonly, people are navigating competing pressures without clear, context-sensitive guidance.
Inconsistent enforcement erodes trust
Even well-written policies can falter when enforcement varies.
If similar claims receive different outcomes depending on who approves them, perceptions of inconsistency quickly take hold. Once employees believe the system is unpredictable, behaviour shifts. Claims become defensive and over-justified, or disengaged and minimal. Neither outcome supports effective governance.
Delays in reimbursement compound the problem. When staff are frequently left out of pocket, expense processes can feel adversarial rather than administrative.
Trust plays a critical role here. When employees perceive the system as fair and predictable, they are more likely to self-regulate. When trust erodes, formal rules lose authority and administrative costs increase.
Modern working patterns have outpaced older policies
Hybrid working, remote travel and digital transactions have created scenarios that many legacy policies were never designed to address. Grey areas multiply. Employees are forced to rely on judgement because the policy does not speak directly to their circumstances.
At the same time, technology has altered the risk landscape. Digital documentation and AI-generated receipts present new verification challenges that traditional, manual controls struggle to manage.
In many cases, policy failure reflects misalignment rather than misconduct. When controls do not reflect how work is actually carried out, compliance becomes more difficult to sustain.
Why adding more rules is rarely the answer
When issues emerge, the instinctive response is often to tighten control by adding further detail and additional exceptions.
However, lengthy and complex documentation increases cognitive load. The more complicated the policy, the less likely it is to be consulted in real time. Employees fall back on memory, precedent or informal advice.
Effective policies prioritise clarity over volume. They focus on common scenarios, provide concrete examples and outline predictable outcomes. Simplicity in this context is not a lack of rigour. It is a deliberate design decision that supports compliance.
Designing policies that reflect real behaviour
Expense policies work best when they are grounded in how people actually think and operate.
This means:
Technology also plays a role. Digital expense management platforms, such as those developed by specialists including Webexpenses, can help standardise processes, improve visibility and reduce reliance on manual checks. When systems are designed around real-world behaviour rather than idealised assumptions, compliance becomes easier and governance more effective.
A broader governance lesson
At their core, expense policies are not simply financial controls. They signal how an organisation balances trust, accountability and practicality.
When policies reflect lived reality, they support cost control without creating friction. When they are detached from how decisions are actually made, they risk becoming well-written documents that quietly fail in practice.
For organisations across Glasgow and beyond, revisiting expense policy through the lens of behavioural insight is not just an administrative exercise. It is an opportunity to strengthen governance, rebuild trust and create systems that work with people rather than against them.
