Can I break my lease in the NT, and what does it cost?

Yes. Periodic: 14 days' notice. Fixed term: you can owe the landlord's loss, and they must limit it.

Your clock

The rule in the NT

Every tenant must sign, with the address and date, or the notice has no effect.

What to send

I give 14 days' written notice that I will leave [address] on [date]. Signed, [every tenant]. Please return my bond.

Who to call

Where this comes from

General information, not legal advice on your situation.