If the job search is being conducted around the most active holiday season(s) normally it is best to inform your customers of the pending pre-booked holiday after the first interview. We find it is best for our customers to understand all the information they require prior to hiring, that way there are no surprises when they are ready for an offer or start date. If your candidate is the right candidate for the company they will make the arrangements.
Asking the Recruitment Professional(s) we represent about pre-booked holidays is part of our interviewing process especially around the active Holiday times in Canada (Summer, Christmas and March Break)
We disclose after the first interview if the feedback is positive and the client wants to move forward. We suggest to the candidate that they offer to take the prebooked vacation time at no pay if it falls within the first six months of employment. Normally if the employer wants to hire they will make the prebooked vacation time off part of the hiring offer. We seldom see an employer accept the offer of the candidate to take off with no pay but they very much appreciate the offer on the part of the candidate.
We always ask if there are any preplanned vacations, medical procedures, relocation or legal problems (like divorce, custody hearings, real estate closing etc) that will require time off work in the initial employment period. None have ever been a problem when disclosed in advance of an offer if the required time off work is a week or less. Longer than a week we advise delayed start date notification prior to offer or wait to interview until the vacation is over.