Citizens of Australia, Canada, South Korea, New Zealand and Taiwan aged 18–30 may be eligible for a 1-year Belgian working holiday visa in the Belgium Federal Public.
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New Zealanders between the ages of 18-35 years are eligible to apply for 43 long stay visas under the working holiday schemes New Zealand has agreed with other countries.
40workingholidays.com has guides on how to apply for the visas, and how to get setup once you arrive.