Upvote:3
Your New Zealand passport needs to be valid on arrival only. It does not need any period of validity beyond that.
Information as of 04MAY17 / 0557 UTC
National New Zealand (NZ) /Embarkation Mexico (MX)
Destination New Zealand (NZ)
New Zealand (NZ)
Passport required.
- Passports and other documents accepted for entry issued to
nationals of New Zealand must be valid on arrival.
VISA NOT REQUIRED.
The Mexicans are only interested in ensuring you have the correct paperwork to exit: temporary visitors get part 2 of their entry form stapled to their passport, which must be returned on exit, but I am not sure what the procedure is for long term residents. They won't worry about your passport being close to expiry.