How to Set Up Expense Approval Workflows for Your Team

When it's just you and a spreadsheet, expense management is simple: you spend, you record, you move on. But the moment your team starts incurring expenses, everything changes. Without a structured approval workflow, spending creeps up, receipts go missing, and you have no visibility over where the money is going until it's already gone.

Setting up an expense approval workflow for your team doesn't have to be complicated. A simple, actually-used system beats a perfect one nobody understands. Here's how to build one that protects your business without creating the bureaucratic friction that makes employees reluctant to incur necessary expenses.

Why approval workflows matter

Spending control

Without approval requirements, there's no check on whether an expense is necessary, reasonable, or within budget. An approval step forces a conscious decision about every expenditure. You're not creating busywork — you're creating a pause point where someone asks "is this the best use of company money?"

Fraud prevention

Expense fraud — inflated mileage claims, fictitious receipts, personal items submitted as business expenses — is one of the most common types of workplace fraud reported to Action Fraud, the UK's national reporting centre. An approval workflow with receipt requirements makes fraud harder to commit and easier to detect. You're not accusing anyone of dishonesty; you're creating a system where dishonesty is visible.

Budget adherence

When approvers can see how much has already been spent against budget, they make informed decisions before approving the next expense. This prevents the month-end surprise where you've blown past budget because no one was watching the running total. (Spoiler: it's always the travel and entertainment categories.)

Accurate financial records

A structured workflow ensures every expense is recorded, categorized, and supported by documentation. This makes your accounts more accurate, simplifies tax preparation, and provides evidence if expenses are questioned by HMRC. Better records mean better profit and loss visibility, which means better business decisions.

Tax compliance

To claim tax deductions for business expenses, you need proper documentation — receipts, business purpose, and authorization. HMRC's guidance on allowable business expenses and guidance on expenses and benefits for employers set out what can and cannot be claimed. An approval workflow creates this documentation systematically, not as an afterthought.

Building your expense policy

Before setting up workflows, define the rules. Your policy should cover:

What can be expensed

List allowable categories:

• Travel (flights, trains, taxis, mileage)
• Accommodation
• Meals and client entertainment (with per-person limits)
• Office supplies and equipment
• Software and subscriptions
• Professional development and training
• Client gifts (with value limits)

Be specific. "Reasonable travel expenses" invites interpretation and arguments. "Economy class for domestic flights, business class for international flights over six hours" is clear.

Spending limits

Set limits at multiple levels to distribute approval authority:

• Per-transaction limits — Maximum for a single expense without escalation (e.g., invoices under £50 auto-approve with a receipt)
• Per-category limits — Monthly or quarterly caps for higher-risk categories
• Per-person limits — Monthly spending authority by role

Receipt requirements

Specify what's needed:

• Receipts required for all expenses above a minimum (typically £10–25)
• Itemized receipts for meals (not just the total)
• Mileage logs for vehicle expenses
• Pre-approval for expenses above a certain threshold

Approval hierarchy

Define who approves what:

• Line manager approval for routine expenses within policy
• Department head approval for expenses above a threshold
• Finance director approval for exceptional or high-value expenses
• No self-approval — this is non-negotiable

How to set up the workflow

Step 1: Configure expense categories

In your accounting software, create categories that match your policy:

• Travel — flights / ground transport / mileage
• Accommodation
• Meals — client entertainment / team working meals
• Office supplies
• Software and subscriptions
• Professional development

Align these with your chart of accounts so expenses post to the correct GL code automatically.

Step 2: Define approval rules

Configure rule-based routing in your software:

• Under £100: auto-approve (with receipt)
• £100–500: route to line manager
• £500–2,000: route to department head
• Over £2,000: route to finance director
• All entertainment expenses: always require approval regardless of amount
• Equipment purchases over £500: route to IT manager

This removes guesswork and ensures consistency across approvers.

Step 3: Set submission requirements

Specify exactly what must be provided:

• Date of expense
• Amount and currency
• Category
• Business purpose (two sentences minimum — "coffee" doesn't cut it; "client meeting with XYZ Ltd to discuss Q2 contract" does)
• Receipt (digital photo or scan)
• Project or cost-centre code (if applicable)

The clearer your requirements upfront, the fewer times expenses bounce back for more information.

Step 4: Enable notifications

Set up automatic alerts:

• Approvers notified when expenses are waiting (and reminded after 2 days)
• Submitters told when approved or rejected
• Finance notified of approved expenses ready for processing
• Escalation alerts for expenses pending over 3 business days

Notifications are what keep the system moving. Without them, expenses sit in a queue and employees get frustrated.

Step 5: Train your team

Provide clear guidance on:

• How to submit (with screenshots)
• What documentation is required
• Timelines for approval and reimbursement
• What happens if an expense is rejected
• When they can expect reimbursement (aim for 5 business days)

A 10-minute onboarding video saves weeks of support questions later.

Approval patterns that actually work

Linear approval (teams under 20 people)

Employee submits → Manager reviews → Finance processes

Everyone follows the same path. Simple. Fast. Works when you don't need multiple approval levels.

Threshold-based approval (medium teams with clear spending authority)

Under £100: Auto-approve
£100–500: Line manager
£500–2,000: Department head
Over £2,000: Finance director

Routine expenses move quickly; bigger spending gets appropriate scrutiny. This is the sweet spot for most 10–50 person teams.

Category-based approval (when different risks need different reviewers)

Travel / accommodation → Line manager
Client entertainment → Department head (always)
Software purchases → IT manager
Equipment purchases → IT manager

Route each category to the person best positioned to assess whether it's a good use of money.

Pre-approval for large expenses

Planned expense over £500 → Submit request → Manager approves
→ Make purchase → Submit receipt

This prevents post-hoc submissions where an employee spends £2,000 and then asks for approval. Pre-approval creates intentionality.

Making it work in practice

Keep controls proportionate

Focus controls on material expenses and higher-risk categories. Requiring three sign-offs for a £5 parking receipt wastes everyone's time and breeds resentment.

Set approval deadlines

Define how quickly approvers should respond — two to three business days is reasonable. Expenses sitting in an approval queue for weeks frustrate employees and delay accurate record-keeping.

Provide constructive feedback on rejections

When rejecting an expense, explain why:

❌ Don't: "Rejected" ✓ Do: "Rejected — exceeds per-meal limit of £25. Please resubmit within policy or provide justification for the excess."

Constructive feedback helps people understand the policy rather than feel shut down.

Reimburse promptly

Once expenses are approved, process reimbursement within 5 business days. Employees who wait weeks become reluctant to incur necessary business expenses, which hinders their effectiveness and damages morale.

Review quarterly

Pull expense reports each quarter and ask:

• Which categories consistently overspend against budget?
• Are certain expenses rejected repeatedly? (Suggests unclear policy.)
• Where are approval bottlenecks slowing things down?
• Are there patterns suggesting policy abuse or misunderstanding?

Use this data to refine policy and adjust workflows.

How software simplifies this

Modern accounting platforms handle most of the expense process automatically:

• Mobile receipt capture — Employees photograph receipts; the app extracts amount, date, merchant
• Auto-categorization — Software suggests the right category based on merchant name
• Rule-based routing — Expenses automatically route to the right approver without manual intervention
• Approval anywhere — Managers approve on their phone while travelling; no need to wait until back at a desk
• Auto-posting — Approved expenses post to the correct GL accounts automatically
• Mileage tracking — Built-in calculator replaces spreadsheets and guesswork
• Integration with your full accounting system — No re-entry, no sync errors

This automation removes the tedium that makes expense management feel like busywork and lets your team focus on running the business.

Frequently Asked Questions

Q: Can employees approve their own expenses? No. Self-approval defeats the purpose by removing the check on whether spending is necessary. Everyone's expenses should be reviewed by someone else. It's not personal; it's how control systems work.

Q: What's the minimum threshold for requiring a receipt? HMRC typically expects receipts for expenses above a certain amount (commonly £5–25 depending on context). Set this based on your risk tolerance and team size. Smaller teams can require receipts for everything. Larger teams might set £25 to reduce friction without losing visibility.

Q: How do I handle recurring expenses that don't need approval each time? For truly recurring, pre-approved expenses like a monthly software subscription, you can auto-approve them if submitted. Document which expenses fall into this category. Everything else flows through the normal approval process.

Q: What if an employee disagrees with a rejection? Build in an appeal or escalation process. Let them resubmit with additional justification or ask for a higher-level review. People accept decisions they disagree with more readily when they understand the reasoning and have been heard.

Q: How do I handle foreign currency expenses? Specify in your policy which exchange rate employees should use (typically the Bank of England daily rate on the expense date). If your system integrates with a currency API, it can auto-populate the correct rate. Document this in training so there's no ambiguity.

Q: What if someone repeatedly submits expenses that don't meet policy? Assume it's an understanding problem first, not dishonesty. Provide one-to-one feedback or refresher training. If it continues, escalate to their manager. Pattern violations deserve a conversation before assuming intent.

Q: Should I pre-approve expenses for recurring business activities? Yes. If someone travels to the same client monthly or attends recurring training, pre-approve a batch at the start of the quarter. This reduces approval friction without losing control. Just require receipts and periodic audits to ensure expenses match what was approved.

Q: How does this integrate with accounts payable and accrued expenses? Approved expenses automatically flow into accounts payable, where they're matched to GL codes and recorded as accrued expenses if not yet paid. This keeps everything connected and ensures accurate financial reporting.

Start with structure, not perfection

You don't need a perfect system from day one. Start with a simple policy, basic workflow, and receipt requirements. As your team grows, add complexity — additional approval levels, category-specific rules, tighter controls.

The important thing is to start. Any structured expense process is better than no process at all. Your team will actually use a simple system that works. A perfect system nobody understands collapses under its own weight.