Approval Workflow

What is an Approval Workflow?

An approval workflow is a predefined routing path that a request, document, or transaction must follow before it is considered finalized or authorized. In business travel and expense management, it means the structured process that routes trip bookings and expense reports through one or more designated reviewers who accept, reject, or request changes before authorization is granted.

The workflow exists to enforce accountability. Rather than leaving every spending decision to individual judgment, it encodes rules into a repeatable process: who reviews a submission, in what order, and under which conditions. When those rules are configured in software, the process becomes automated. The system reads the submission, checks it against policy, and routes it to the correct approver (or auto-approves it) without requiring human direction at each step.

At its core, an approval workflow answers three questions: who reviews a request, in what sequence does it proceed, and under what conditions is it approved or escalated.

Types of Approval Workflows in T&E

Corporate travel and expense programs use two primary workflow types, each applied at a different stage in the spending cycle.

Pre-trip authorization

Pre-trip workflows require employees to submit travel requests before confirming a booking. A manager, travel manager, or designated approver reviews the proposed itinerary against the company's expense policy and either approves it, requests changes, or declines. Some organizations require pre-trip authorization only when a request falls outside policy parameters. Others require it for all trips above a certain cost threshold.

Pre-trip workflows give organizations control over travel spend before any money changes hands. Reviewing requests at the planning stage prevents out-of-budget trips rather than managing disputes or refunds after travel is complete.

Post-trip expense reimbursement

Post-trip workflows handle expense report submissions after travel is complete. An employee submits itemized expenses and receipts. The workflow routes the report to a direct manager, then finance, then accounting. If all items fall within policy, the workflow may bypass human reviewers entirely through automated approval.

Post-trip workflows are where most T&E compliance issues surface. Incomplete receipts, miscoded expense categories, and duplicate expense submissions are common friction points. Automated policy checks catch these issues before the report reaches an approver, reducing back-and-forth between employees and reviewers.

Manual vs. automated workflows

Manual workflows rely on email chains, spreadsheets, or paper-based routing. Approval decisions happen at each reviewer's discretion, with no system-enforced deadlines or escalation rules. Automated workflows encode the routing logic into software. The system reads the submission, applies rules, and sends it to the correct approver (or auto-approves it) without requiring human direction for each routing step.

How an Approval Workflow Operates

A standard T&E approval workflow moves through five stages.

Step 1: Submission. An employee submits a travel request or expense report, including purpose, receipts, cost estimates, and any required supporting documentation.

Step 2: Policy check. The system (or a manual reviewer) compares the submission against the company's T&E policy, verifying spend category, amount, vendor eligibility, and receipt completeness.

Step 3: Routing. The submission is directed to the appropriate approver or queue. Compliant submissions may be auto-approved. Out-of-policy submissions go to a manager, finance team member, or other designated approver based on the configured routing rules.

Step 4: Review and decision. The approver accepts, rejects, or requests additional information. Multi-level workflows escalate submissions to a second or third approver when the initial reviewer lacks sufficient authority for the transaction size. For example, expenses above a defined threshold might route automatically to a VP of Finance.

Step 5: Record-keeping. Each decision, whether an approval, rejection, or modification, is logged with a timestamp and the approver's identity. This creates the audit trail that supports internal controls and external compliance requirements.

Escalation and fallback rules are critical design elements. Well-designed workflows define what happens when an approver is unavailable, when a submission exceeds a dollar threshold, and when a report is flagged for suspected policy violation.

Why Automated Approval Workflows Matter for Finance Teams

Manual approval processes create predictable bottlenecks. According to GBTA's 2025 "The Perfect Business Trip" survey of U.S. and Canada-based travel managers, 50% of travel managers cite expense reports as a significant source of program friction, and 63% identify a manual, time-consuming expense submission process as the leading pain point. [1] Finance teams relying on email-based approvals face delayed reimbursements, inconsistent enforcement, and limited visibility into real-time spend.

Automated workflows address these issues in three ways.

Consistent policy enforcement. Rules are applied the same way every time, regardless of which manager reviews the submission. An expense that exceeds a per diem limit, lacks a receipt, or uses an unapproved vendor gets flagged automatically. This matters especially for organizations managing programs across multiple departments or regions, where manual review creates inconsistency.

Faster reimbursements. Removing manual routing steps compresses approval cycles. Compliant submissions that previously waited days in email queues can move through in hours. Faster approvals also support tighter expense reconciliation and help finance teams close books on schedule.

Improved auditability. Every automated workflow generates a complete record of who approved what, when, and at what dollar amount. Finance teams use this data in expense analytics to identify spending patterns, measure policy compliance rates, and inform spend forecasting.

Approval Workflow Best Practices for T&E Programs

Match routing depth to risk level. Not every expense needs multiple levels of review. Low-value, in-policy submissions should auto-approve or require only one approval. Reserve multi-level escalation for high-value transactions, exceptions to policy, or first-time vendor charges. This keeps approval queues manageable and prevents approver fatigue.

Define escalation and fallback rules. Build in automatic escalation to a backup approver if the primary reviewer hasn't responded within a defined period (such as 48 hours). Workflows without fallback rules create delays and stalled requests that hold up reimbursement cycles.

Use thresholds rather than blanket approvals. Configure approval triggers based on transaction amount, spend category, or deviation from historical patterns. This focuses approver attention on submissions that carry real financial risk rather than requiring sign-off on every small purchase.

Integrate booking and expense approvals. Workflows are most effective when pre-trip authorization and post-trip reimbursement connect in a single system. When a corporate card transaction is automatically matched to a pre-approved trip, post-trip expense review becomes faster and less error-prone.

Navan Expense supports configurable approval workflows that apply these principles: automating compliant submissions, routing exceptions to the designated approver, and escalating high-value transactions to senior reviewers based on preset thresholds.

Getting Approval Workflows Right

Approval workflows are foundational to any T&E program that balances employee autonomy with financial oversight. The difference between a functional workflow and an effective one often comes down to automation depth: whether the system enforces policy consistently, routes exceptions intelligently, and creates the records that compliance and finance teams rely on. Organizations that invest in well-designed approval logic spend less time managing exceptions and more time acting on the spend data those workflows produce.

Sources

[1] GBTA (Global Business Travel Association), "The Perfect Business Trip," 2025. https://www.gbta.org

Related Terms

• Expense Approval: The act of reviewing and authorizing a business expense submission, one key step within an approval workflow.
• Expense Policy: The corporate rules that define which expenses are allowed, what documentation is required, and what spending thresholds trigger different approval levels.
• Audit Trail: The timestamped record of approval decisions, approver identities, and status changes that approval workflows generate for compliance and financial review.