Yes, your UK employer can change or cancel your approved leave dates — but only if they give you notice at least as long as the leave itself. A five-day holiday needs at least five days’ notice to move or cancel; a single day needs at least one. This comes from the Working Time Regulations 1998, and it applies even if you booked the time off months ago.
That is a low legal bar, which is why so many people feel blindsided when it happens. The rule itself is simple to check, and there are practical steps to take if the timing doesn’t add up or the change has cost you money.
The Short Answer
Under regulation 15 of the Working Time Regulations 1998, an employer can require you not to take leave on the days you had planned, or require you to take it on different days instead. The only statutory condition is notice. There is no requirement for the employer to state a reason, and having already booked and paid for something does not, by itself, stop them.
How Much Notice Does Your Employer Have to Give?
The notice period is tied directly to the length of the leave being changed. ACAS guidance puts it plainly: your employer “must let you know beforehand by at least the same amount of time as the amount of leave” affected — in practice, that length plus one day, since the notice has to land before the countdown starts.
| Approved leave being changed | Minimum notice required |
|---|---|
| 1 day | 1 day |
| 3 days | 3 days |
| 5 days | 5 days |
| 10 days | 10 days |
Two things to check alongside this. First, the notice must name the specific days affected — a vague heads-up that “things might change” does not count. Second, your contract may set out a longer notice period or a different process; if it does, the contract terms apply on top of the statutory minimum, not instead of it.
What If You’ve Already Booked Non-Refundable Travel?
This is the part that stings, and unfortunately the law does not give you an automatic right to reimbursement. Neither the Working Time Regulations nor ACAS guidance creates a stronger legal right simply because you have spent money in reliance on the approval.
That said, here is what to actually do about it:
- Check your contract and staff handbook first. Some employers, particularly in sectors where changes are common, include a clause covering non-refundable costs. If yours does, it is enforceable.
- Ask in writing, even without a clause. Attach your booking confirmation and any cancellation charges. Many employers will cover reasonable costs to avoid damaging goodwill, as a matter of good practice rather than legal obligation.
- Keep the paper trail. If a manager approved your leave knowing you were about to book travel, that context matters if things escalate later.
Don’t assume reimbursement is guaranteed just because it would feel fair — treat it as a request, not a claim you’re certain to win.
What to Do If You Think the Change Is Unfair
Work through this in order before you escalate anything.
- Get the change confirmed in writing, including which days are affected and when the decision was made.
- Count the notice period against the table above — if your employer fell short, the change isn’t valid.
- Check whether it targets you specifically. Repeatedly changing one person’s leave, or doing it after a grievance, flexible working request, or protected characteristic, can cross into discrimination or victimisation under the Equality Act 2010.
- Check the leave year math. If the new dates push you close to year-end with days unused, your employer must give you a real chance to take your full entitlement — see carrying over annual leave in the UK.
- Raise it formally through your grievance procedure, then ACAS early conciliation if it doesn’t resolve informally.
FAQ
Does my employer need a reason to change my leave dates?
No. The Working Time Regulations do not require a stated business reason — only valid notice. That said, an unreasonable or unexplained pattern of changes can still support a separate claim, such as a breach of the implied term of trust and confidence.
Can my employer change my leave dates after I’ve already started my holiday?
Recalling someone mid-leave is a different, higher-risk scenario for the employer than changing dates before leave starts, and it is usually handled as a request rather than a demand. If you are asked to return early and refuse, any time you don’t actually work should remain paid leave.
What’s the difference between my employer cancelling leave and changing my leave dates?
Legally, very little — both fall under the same notice rule in regulation 15. See our full breakdown in employer cancelling approved leave: the letter and legal risk guide if your situation looks more like an outright cancellation than a reschedule.
Can I just refuse the new dates?
Not outright, if your employer has given valid notice — but you can push back on the specific dates offered, ask for alternatives, and put your objections in writing. Check your UK annual leave entitlement to confirm exactly how many days you’re owed before you negotiate.
Keep the Paper Trail, Know the Rule
The notice period is short, but it is real, and plenty of employers get it wrong simply by not counting the days properly. Knowing the rule — and writing down dates as they happen — is what turns “that feels unfair” into something you can actually act on.
This article is general information about UK employment law, not legal advice. Check your own contract and take advice on your specific circumstances.