I’ve been told it’s because the host country doesn’t want to be responsible for you after your passport expires if, God forbid, something happens like you get injured and end up in a local ...

“For a seamless travel experience, I recommend that the renewal process be started at least one year before a passport expires to ensure you get your new book in time and can enjoy your vacation ...

Also note that your current passport will no longer be valid (even if it has not yet expired) once you submit your application for renewal. If you meet all of the above requirements, you can ...