Declining a leave request is one of the most sensitive decisions a manager makes. Do it poorly and you damage trust; do it well and the employee accepts the decision and plans around it. Under UK law, employers can refuse annual leave as long as they give notice equal to the length of the leave requested — but the refusal must not be arbitrary, discriminatory, or in retaliation for exercising a statutory right.
Key Takeaways
- Employers in the UK can refuse annual leave but must give notice equal to the duration of the leave requested (e.g. five days’ notice for a five-day request).
- A refusal must not be discriminatory or in retaliation for a protected act — this includes maternity, flexible working requests, or trade union membership.
- Operational need, insufficient cover, and conflicting requests are the three most common lawful grounds for refusal.
- A clear, written refusal that explains the reason and suggests alternatives preserves the working relationship.
- Refusing statutory leave (maternity, paternity, parental, carers, emergency time off for dependants) is not permitted.
Template 1: Refusal Due to Operational Need
This is the most common reason for declining annual leave. Be specific about the operational impact.
Subject: Update on Your Annual Leave Request — [Dates]
Dear [Employee Name],
Thank you for your annual leave request for [Start Date] to [End Date].
After reviewing current workloads and team availability, I am unable to approve this request because [specific reason, e.g. "we have two other team members on leave that week" / "we are running the [Project Name] go-live during this period"].
I would like to find an alternative that works for you. Are any of the following dates possible?
- [Alternative date range 1]
- [Alternative date range 2]
- [Alternative date range 3]
Please let me know your preference, and I will confirm as soon as possible.
I appreciate this is disappointing, and I want to make sure you get the time off you need.
Best regards,
[Your Name]A specific operational reason — without over-sharing — helps the employee understand the decision. Offering alternatives shows good faith.
Template 2: Refusal Due to Conflicting Requests
When multiple team members request the same period, you need a fair process.
Subject: Update on Your Annual Leave Request — [Dates]
Dear [Employee Name],
Thank you for your annual leave request for [Start Date] to [End Date].
Unfortunately, several team members have requested leave during the same period, and I am unable to maintain adequate cover if all requests are approved. I have approved the requests that were received earliest, following our first-come, first-served policy.
I can offer you the following alternative dates:
- [Alternative date range 1]
- [Alternative date range 2]
Alternatively, I can place you on a standby list in case any of the approved requests change. Would you like me to do that?
I understand this is frustrating, and I will do my best to approve your next request promptly.
Best regards,
[Your Name]A published leave policy should define how conflicting requests are resolved — first-come, first-served is common, but seniority or rotation-based systems also work.
Template 3: Refusal for Peak Period / Blackout Dates
Many businesses have formal blackout periods where leave is restricted.
Subject: Update on Your Annual Leave Request — [Dates]
Dear [Employee Name],
Thank you for your annual leave request for [Start Date] to [End Date].
Unfortunately, this period falls within our [Christmas shutdown / year-end processing / peak season] blackout period, during which annual leave is not available per our leave policy. You can review the policy here: [link to policy].
You are welcome to take leave immediately before or after this period. The following dates are available:
- [Alternative date range 1]
- [Alternative date range 2]
Please let me know if you would like to proceed with one of these alternatives.
Best regards,
[Your Name]Blackout periods should be communicated well in advance — ideally at the start of the leave year. See our leave embargo announcement template for communicating these.
Template 4: Refusal for Insufficient Cover
When the team would be understaffed, the refusal should acknowledge the employee’s needs while being clear about the constraint.
Subject: Update on Your Annual Leave Request — [Dates]
Dear [Employee Name],
Thank you for your annual leave request for [Start Date] to [End Date].
After reviewing team availability for this period, I am unable to approve the request because we would not have sufficient cover for [specific function or responsibility]. With [Colleague Name] also on leave that week and [Project Name] at a critical stage, I cannot safely approve additional time off.
I would like to propose [alternative dates] instead. Would one of these work for you?
I value your contribution and want to make sure you get the break you need. Please let me know what works best.
Best regards,
[Your Name]Template 5: Refusal of a Flexible Working / Pattern Change
Flexible working requests follow a different process under UK law. A refusal must state one of the eight statutory grounds.
Subject: Outcome of Your Flexible Working Request — [Your Name]
Dear [Employee Name],
Thank you for your flexible working request to [change your working pattern / work compressed hours / work from home on specific days].
After careful consideration, I am unable to approve this request because it would [have a detrimental effect on performance / cause an inability to reorganise work among existing staff / result in additional costs].
This decision is based on one of the statutory grounds for refusal under section 80G of the Employment Rights Act 1996.
I understand this may be disappointing. If you would like to discuss alternative arrangements or appeal this decision, please let me know. You also have the right to make a new flexible working request after 12 months.
Best regards,
[Your Name]Flexible working is a statutory right in the UK — the refusal must reference one of the eight permitted business grounds under the Employment Rights Act 1996. For more detail, see our UK right to request flexible working guide.
What You Cannot Refuse
The following types of leave cannot be refused by UK employers:
- Statutory maternity, paternity, adoption, and shared parental leave — these are legal rights, not discretionary benefits.
- Parental leave (up to 18 weeks per child) — you may request postponement in limited circumstances but cannot refuse outright.
- Emergency time off for dependants — a reasonable amount of unpaid leave for family emergencies.
- Carer’s leave (from April 2024) — one week per year, statutory entitlement.
- Leave taken in accordance with a contractual entitlement that you have already agreed to.
- Antenatal appointments — for pregnant employees and their partners.
Attempting to refuse any of these could result in an employment tribunal claim. If you are unsure, seek advice from ACAS or your legal adviser.
FAQ
Can a UK employer refuse annual leave without a reason?
No. While the employer has the right to refuse, the refusal must be based on a legitimate business reason (operational need, insufficient cover, conflicting requests). A refusal without reason could be challenged as unreasonable or discriminatory.
How much notice must an employer give when refusing leave?
Under the Working Time Regulations 1998, an employer must give notice equal to the length of the leave requested. For a five-day leave request, you must give at least five days’ notice of refusal.
Can I refuse leave because of the employee’s performance?
Not directly. Poor performance is a separate matter and should be addressed through your performance management process, not by refusing annual leave. Refusing leave for a reason unrelated to business need could be considered a detriment.
What if an employee takes leave anyway after a refusal?
This would normally be treated as unauthorised absence. Follow your disciplinary process — see our unauthorised absence letter template. However, consider whether the circumstances suggest the refusal was unreasonable before proceeding.
Can an employee appeal a refused leave request?
There is no statutory right to appeal a refused annual leave request, but it is good practice to offer one. Many employers include an informal appeal step in their leave policy to resolve disputes without escalation.