When you take your career break is really up to you and really depends on your individual situation. There is never a perfect time to go somewhere, but the longer you take planning your career break, the better it will be.
There are 3 main things to consider when deciding when to take your career break:
Most career breakers take a career break before they have children. The reasons for this are both practical and financial. Although it's possible to take a career break when you have children (and people do it every year), it's usually easier when you have no dependents, especially if you want to do voluntary work.
The majority of travelling career breakers are single, and many of these have chosen to travel after their long-term relationship broke up. If you have a partner it can sometimes be harder to schedule your career breaks together, and if you want to volunteer, it may take longer to find placements that suit you both in the same area. Some career breakers leave their partners at home (and send lots and lots of postcards).
If you are able to take a sabbatical (paid or unpaid), your career break will depend on what you negotiate with your company. You will usually have to work there for at least 2 years before requesting a sabbatical, and you may be asked to take it at a particular time of year. You may want to think about:
Remember that, unless you leave your job at the beginning of April, you will probably be entitled to an income tax refund (which you can apply for when you get back). You can print off the forms you need from the HM Revenue & Customs site.
If you're travelling around the world, think about where you're going to be and when. There's always a 'best' time of year to go somewhere, but there are benefits to going places at low season too. Think about:
Benefits to being somewhere at the 'best' time of year:
Benefits to being somewhere during the less popular times:
This site's advanced search facility lets you choose when you want to go.