My manager has asked me to provide some leave dates now to ensure my Dec 2019 year end balance is not more than 2 weeks. I don't need to lodge in system but need to show that I have leave planned.
Do I need to provide this information now?
I feel I shouldn't have to provide the dates now and as long as I take the 4 weeks in 2019 I shouldn't have to commit to it this month?
Edited to remove exact email.
I think its reasonable to give your manager an idea of when you want to take time off. Give him/her a chance to plan things. Also sounds like you have a small team and you probably would want to avoid having two people off at the same time, so this give you plenty of time to work it out.
Obviously you don't have to make any commitments and you arent even formally lodging it. If you want time off at peak times like school holidays and easter/christmas I would suggest getting leave in first as this is usually first in best dressed.