Managing employee leave sounds straightforward until more than one manager is involved.

One manager approves an employee’s holiday. Another manager approves a colleague’s request for the same dates. Neither sees the other’s decision, and suddenly a team that appeared fully staffed is short of people.

The problem isn’t necessarily that either manager made a bad decision.

The problem is that they didn’t have the same information when they made it.

This becomes increasingly difficult when businesses operate across multiple departments, locations or working arrangements. Requests may be submitted by email, recorded in spreadsheets, discussed in Teams or Slack and approved by different managers.

Without one clear process, it becomes difficult to know what has actually been requested, approved or changed.

In this guide, we’ll look at five common leave management mistakes, why they can create staffing and administrative problems, and how a structured leave management system can help businesses prevent conflicts before leave is approved.

 

What Happens When Leave Approvals Go Wrong?

A single leave request may look harmless. The problem appears when several requests are considered separately instead of as part of the wider team’s availability.

The consequences can include:

• Too many employees being absent at the same time.
• Key skills or roles being unavailable.
• Last-minute changes to workloads and rotas.
• Additional overtime or temporary staffing costs.
• Confusion about who approved a request.
• Employees being asked to reconsider leave after making plans.
• HR spending time investigating what happened.

By the time a conflict is discovered, employees may already have booked travel, made arrangements or organised childcare.

The real problem isn’t always the individual approval.

It is the leave management process that failed to give managers the information they needed before making the decision.

 

Why Do Conflicting Leave Approvals Happen?

Duplicate or overlapping leave approvals rarely happen because managers deliberately ignore staffing requirements.

More often, the information they need is spread across different systems.

One manager may have a spreadsheet.

Another may rely on a shared calendar.

An employee may have requested leave by email.

HR may have a separate record.

When these systems are not connected, there is no single reliable view of employee availability.

The most common problems usually come down to:

• Unclear approval responsibilities.
• Poor visibility of team availability.
• Disconnected leave records.
• Manual updates.
• Changes not being communicated.
• No clear audit trail.

Let’s look at five common mistakes.

 

Mistake 1: More Than One Manager Can Approve the Same Request

In many organisations, employees work with more than one manager.

They may report to a department manager while also working under a team leader, project manager or site manager.

Problems arise when it isn’t clear who has final responsibility for approving leave.

An employee may send a request to two managers. Both may assume the other has not yet approved it. Or one manager may approve the request without knowing another manager has already made a decision affecting the same team.

A clear approval process removes this uncertainty.

Each request should follow a defined route to the appropriate manager, creating one clear decision and one reliable record.

The goal is simple:

One request. One approval route. One clear record.

 

Mistake 2: Managers Approve Leave Without Seeing Who Else Is Off

Having enough annual leave remaining does not automatically mean the requested dates work for the business.

A manager may approve an employee’s holiday without knowing that several other employees have already booked the same period.

Each individual request may look reasonable.

Together, they may leave the team without enough people to operate effectively.

Managers therefore need visibility of:

• Approved leave.
• Pending requests.
• Team availability.
• Important staffing requirements.
• Potential overlapping absences.

Seeing this information before approving the request gives managers an opportunity to identify potential conflicts rather than discovering them later.

 

Mistake 3: Leave Requests Are Spread Across Emails, Messages and Spreadsheets

Email and spreadsheets can work for small teams. As an organisation grows, however, they can quickly create multiple versions of the same information.

One manager approves a request by email.

Another updates a spreadsheet.

An employee sends a change through Teams.

HR later discovers that the spreadsheet does not match the calendar.

Now someone has to work out which record is correct.

This creates unnecessary administration and increases the risk of missed or incorrectly recorded leave.

Keeping requests and approvals in one central system gives managers and HR a shared source of information.

 

Mistake 4: Approved Leave Changes but the Records Don’t

Leave plans change.

An employee may cancel a holiday, move the dates or shorten their time away.

The problem occurs when the change is communicated to one person but isn’t reflected everywhere else.

For example, a manager may know that an employee has cancelled their holiday, while HR’s spreadsheet still shows the original dates.

Another manager may then make staffing decisions based on outdated information.

Changes and cancellations should therefore update the same central record as the original request.

This ensures that managers are working with the most current information when making new decisions.

 

Mistake 5: Nobody Can See Who Approved What

When leave is managed manually, it isn’t always easy to establish:

• Who approved the request.
• When it was approved.
• What dates were originally requested.
• Whether the dates were later changed.
• Who authorised the change.

This becomes particularly frustrating when HR needs to investigate a conflicting approval or check an employee’s leave history.

Searching through emails, messages and spreadsheets takes time and may still leave gaps.

A clear approval history gives HR and managers an audit trail for each request.

That makes it easier to answer questions, resolve disputes and maintain accurate records.

 

A Practical Example: Two Managers, Two Approvals, One Staffing Problem

Imagine a customer service team with employees working across both remote and office-based arrangements.

Two experienced employees request the same Friday and following Monday off.

One request goes to the department manager.

The other goes to a team leader.

Both managers approve the requests because neither can see the other’s decision.

A few days before the weekend, the business realises that it doesn’t have enough experienced employees available to handle customer enquiries.

Neither manager intentionally caused the problem.

The issue was that neither had a complete view of team availability when making the decision.

With a centralised leave management system, both requests would be visible in the same place, allowing managers to identify a potential staffing conflict before approving the leave.

 

Why Remote and Hybrid Teams Make Leave Visibility More Important

Managing leave becomes more complicated when employees work across offices, sites and home environments.

Managers can no longer rely on informal conversations such as:

“Are you working Friday?”

or:

“I think Sarah is off next week.”

A remote employee may have leave approved by one manager while another manager plans workloads without knowing they will be unavailable.

The same issue can arise across:

• Different offices.
• Departments.
• Sites.
• Shifts.
• Remote teams.
• Hybrid teams.

A central leave calendar gives managers a shared view of availability, regardless of where employees work.

 

When Can Leave Management Become a Compliance Problem?

Overlapping leave is not automatically a legal or compliance issue.

The risk can arise when poor processes result in:

• Inaccurate leave records.
• Incorrect leave balances.
• Inconsistent treatment of employees.
• Errors in statutory leave administration.
• Difficulty demonstrating what leave was requested or approved.

Businesses in both the UK and Ireland need to manage employee leave appropriately and maintain accurate employment records.

When approvals, changes and balances are scattered across different systems, it becomes harder for HR to establish exactly what happened.

Accurate records and a consistent approval process therefore support both effective workforce planning and good HR administration.

 

How Automated Leave Approval Workflows Prevent These Problems

Automation does not remove managers from the approval process.

It gives them the information they need to make better decisions.

Instead of checking spreadsheets, emails and separate calendars, managers can review requests through one structured process.

They can see existing leave, check team availability and make a decision before a potential conflict becomes a staffing problem.

A digital leave management system can provide:

Clear Approval Routes

Leave requests follow a defined workflow, helping ensure they reach the appropriate manager rather than being handled by several people independently.

Real-Time Team Visibility

Managers can see approved and pending leave before accepting another request, making potential overlapping absences easier to identify.

Centralised Leave Records

Requests, approvals, changes and balances are kept together, giving HR and managers a single source of information.

Automatic Notifications

Managers can be alerted when requests require their attention, while employees can see when their leave has been approved, declined or updated.

Clear Audit Trails

Each request and decision creates a record, making it easier to see who approved leave, when the decision was made and whether anything changed afterwards.

 

Leave Approval Checklist: Could This Happen in Your Business?

Conflicting leave approvals often expose weaknesses that have existed in the process for some time.

Ask yourself:

• Does every employee know where to submit a leave request?
• Is it clear who is responsible for approving each request?
• Can managers see approved and pending leave before making a decision?
• Could two managers accidentally approve conflicting requests?
• Are changes and cancellations updated in one place?
• Can HR see who approved a request and when?
• Do remote, hybrid and office-based teams follow the same process?
• Is there one reliable record of employee leave?
• Can employees see the status of their own requests?
• Can managers identify potential staffing gaps before approving leave?

If several of these questions are difficult to answer, the issue may not be your managers.

Your leave management process may simply no longer match the way your organisation operates.

 

How HR LeaveHub Makes Leave Approvals Simpler

As teams grow and working arrangements become more flexible, managing leave through disconnected emails, spreadsheets and calendars becomes increasingly difficult.

HR LeaveHub brings requests, approvals and employee leave records together in one central system.

With HR LeaveHub, businesses can:

• Route leave requests through clear approval workflows.
• See approved and pending leave across teams.
• Keep employee leave balances up to date.
• Track requests, approvals and changes in one place.
• Give employees visibility of their leave status.
• Maintain a complete history of employee leave.
• Manage different leave types and working patterns.
• Support remote, hybrid and office-based teams through the same system.

Instead of discovering scheduling conflicts after leave has already been approved, managers have the information they need to identify potential problems earlier.

 

Stop Leave Conflicts Before They Reach the Rota

Leave conflicts are much easier to prevent before a request is approved than to resolve after employees have made plans and managers are trying to fill staffing gaps.

A clear approval process, accurate records and real-time visibility give managers a better understanding of who is available before they make a decision.

HR LeaveHub brings these elements together in one platform, helping businesses across the UK and Ireland manage leave consistently across different teams and working arrangements.

Start your free 14-day trial of HR LeaveHub and make every leave request easier to manage from the start.

 

Frequently Asked Questions

Can two managers approve the same employee’s leave request?

It can happen when leave is managed through emails, spreadsheets or informal processes and approval responsibilities are unclear.

A structured approval workflow helps ensure each request follows a defined route and creates one reliable record of the decision.

What happens if too many employees are approved for leave at the same time?

The business may experience staffing shortages, reduced capacity or difficulty covering key roles.

Managers may need to reorganise workloads or arrange additional cover. Visibility of approved and pending leave can help identify potential conflicts before additional leave is approved.

Can an employer change previously approved annual leave?

There are circumstances in which approved leave may need to change, but employers should consider the applicable legal requirements, notice rules, employment terms and the circumstances of the individual case.

Changes should be handled carefully and consistently, particularly where employees have already made arrangements based on approved leave.

How can managers prevent overlapping annual leave?

Managers need a clear view of team availability before approving requests.

A shared leave calendar, visibility of pending requests and a consistent approval process make it easier to identify when several employees want the same dates and assess whether sufficient cover remains.

Why is email difficult to use for managing leave?

Email does not provide a complete, real-time view of employee leave.

Requests can become buried in inboxes, approvals may not reach HR and changes can create long email chains.

A central leave management system keeps the request, decision and subsequent updates together.

How does leave management software help managers approve holidays?

Leave management software can give managers access to current leave balances, approved absences, pending requests and team availability from one system.

This allows managers to assess requests using current information rather than checking several spreadsheets, calendars and emails.

Is HR LeaveHub suitable for remote and hybrid teams?

Yes. HR LeaveHub provides employees and managers with access to the same central leave management system regardless of where they work.

This supports a consistent process for requesting, approving and tracking leave across remote, hybrid and office-based teams.

Can HR LeaveHub manage employees in both the UK and Ireland?

Yes. HR LeaveHub supports organisations managing employees across the UK and Ireland through one central platform, with different leave types, working patterns and employee records managed within the same system.