Expense approval is the process by which a designated reviewer evaluates, authorizes, or rejects a business expense submission based on corporate spending policies, budget limits, and documentation requirements.
Expense approval is the process by which a designated reviewer evaluates and authorizes business expense submissions before reimbursement or payment is processed. It serves as a financial control that prevents unauthorized spending, ensures policy compliance, and maintains an audit trail.
The ACFE's 2024 Report to the Nations found that expense reimbursement fraud accounts for 11% of all occupational fraud cases, with a median loss of $50,000 per scheme [1]. Approval workflows are the primary preventive control.
Most organizations use tiered approval hierarchies where the required approver level escalates based on the expense amount, with thresholds commonly set at $500, $2,500, and $10,000.
Navan automates expense approvals by routing submissions through policy-defined workflows, auto-approving compliant expenses below set thresholds, and flagging exceptions for manual review.
Delayed approvals are a top employee complaint in expense management. Approvals that take more than five business days reduce employee satisfaction and increase the likelihood of late or incomplete submissions.
What is Expense Approval?
Expense approval is the review and authorization step in the expense management process where a designated person, typically a manager, finance team member, or department head, evaluates a submitted expense against the company's expense policy and either approves or rejects it.
The approval step exists for three reasons. First, it prevents unauthorized or fraudulent spending by requiring a second pair of eyes on every purchase. Second, it ensures expenses align with budget allocations and project codes. Third, it creates an audit trail that documents who authorized each expenditure.
Without an approval process, companies rely entirely on after-the-fact auditing to catch policy violations, which means non-compliant spending is only discovered after the money has already been spent and reimbursed.
How Do Expense Approval Workflows Work?
An expense approval workflow defines the path an expense submission follows from the employee to final authorization. The complexity of the workflow depends on the organization's size, industry, and risk tolerance.
Single-level approval: The employee's direct manager reviews and approves all expenses. This works for small teams with low expense volume but creates bottlenecks when managers travel or are unavailable.
Tiered approval: Different approval levels are triggered based on expense amount. For example, a manager approves expenses under $500, a director handles $500-$2,500, and a VP is required for anything above $2,500. This distributes the approval workload and applies heavier scrutiny to higher-value expenses.
Policy-based auto-approval: Expenses that fall within predefined policy parameters (correct category, within spending limits, receipt attached, approved vendor) are automatically approved without human review. Only exceptions are routed to a reviewer. This dramatically reduces approval cycle time while maintaining control.
Pre-approval for high-value expenses: Some organizations require approval before the expense is incurred, not after. This is common for travel bookings, conference registrations, and purchases above a certain threshold. Pre-approval prevents out-of-policy spending rather than catching it after the fact.
Best Practices for Expense Approval Processes
Set clear approval thresholds. Define specific dollar amounts that trigger each approval level. Ambiguity in thresholds leads to inconsistent enforcement. Publish the thresholds in the expense policy template so employees know the rules before they spend.
Keep approval chains short. Every additional approver adds days to the cycle. Research consistently shows that approval processes requiring more than two levels of authorization experience significantly higher abandonment rates, where employees stop submitting expenses entirely and absorb the cost.
Enable mobile approvals. Managers who can review and approve expenses from their phone clear queues faster than those who must wait until they're at a desktop. Mobile approval capability is particularly important for organizations with traveling managers.
Separate pre-trip and post-trip approvals. For travel expense reports, consider requiring pre-trip approval for the estimated trip cost and a simplified post-trip approval for the actual expenses. This catches out-of-policy travel before it happens.
Track approval cycle time. Measure the average time from submission to approval. If it exceeds three business days consistently, investigate whether the bottleneck is too few approvers, unclear policies, or technology limitations.
Approver bottlenecks. When a single manager is the approver for a large team, their queue backs up during busy periods. Delegate or backup approver rules prevent one person from blocking dozens of reimbursements.
Inconsistent enforcement. Two managers applying different standards to similar expenses creates employee confusion and policy erosion. Automated policy checks before the approval step ensure consistent baseline compliance regardless of who reviews the expense.
Rubber-stamping. When approvers feel overwhelmed, they approve everything without review, defeating the purpose of the control. Policy-based auto-approval for compliant expenses lets human reviewers focus their attention on the exceptions that actually need judgment.
Delayed reimbursement. Slow approval cycles delay employee reimbursement, creating dissatisfaction and eroding trust in the expense process. For companies using Navan, automated policy checks and configurable auto-approval rules reduce the average approval cycle from days to hours.
Approval Workflow: The defined routing path that expense submissions follow from employee to authorized approver, including escalation rules and auto-approval triggers.
Expense Policy: The corporate rules governing business spending that define what expenses are allowed, required documentation, and approval thresholds.
Expense Tracking: The broader process of recording and monitoring business spending, which feeds into the approval workflow with categorized expense data.
Frequently Asked Questions About Expense Approval
Expense approval is the process where a designated reviewer evaluates and authorizes a business expense submission before reimbursement is processed. It ensures spending aligns with corporate policies, budget allocations, and documentation requirements, serving as a preventive control against unauthorized or fraudulent expenditures.
Best practice targets are two to three business days from submission to approval. Approval cycles exceeding five business days are associated with lower employee satisfaction and higher rates of incomplete expense submissions. Automated policy checks and auto-approval for compliant expenses can reduce cycle time to hours.
Auto-approval is a policy-based feature that automatically approves expense submissions meeting all predefined criteria: correct category, within spending limits, receipt attached, and approved vendor. Navan's auto-approval engine processes compliant expenses instantly, routing only exceptions and flagged items to human reviewers.
Common tiered thresholds include manager approval for expenses under $500, director approval for $500-$2,500, and VP or finance approval for amounts above $2,500. The specific thresholds depend on the organization's size, industry, and risk tolerance. Some companies also set category-specific limits.
Key strategies include implementing backup or delegate approvers for when primary reviewers are unavailable, enabling mobile approval so managers can review on the go, using auto-approval for policy-compliant expenses, and keeping approval chains to two levels or fewer. Navan supports all of these through configurable approval workflows.
Pre-approval authorizes an expense before it is incurred, commonly used for travel bookings and large purchases. Post-approval reviews an expense after the employee has already spent the money. Pre-approval is more effective at preventing out-of-policy spending, while post-approval catches violations after the fact.
Accrual accounting is a method of recording financial transactions when they occur, regardless of when the cash transactions happen, ensuring that revenue and expenses are matched in the period they arise.
