The standard lease break fee (below) is based on how much of the tenancy has run but is not obligatory.
41. The tenant agrees that, if the tenant ends the residential tenancy agreement before the end of the fixed term of the agreement, the tenant must pay a break fee of the following amount:
41.1 if the fixed term is for 3 years or less, 6 weeks rent if less than half of the term has expired or 4 weeks rent in any other case, or
41.2 if the fixed term is for more than 3 years, [specify amount]:
If there is no break fee, the Tenants Union advises this in their Factsheet No 16: Ending Tenancy Early
Negotiate an agreed amount of compensation with the landlord/agent. (The landlord may agree not to be compensated.) Discuss whether the landlord will claim from your bond. Put any agreement in writing.
If you cannot come to an agreement, the landlord/agent may apply to the NSW Civil and Administrative Tribunal for an order that you pay a certain amount in compensation. The landlord must:
provide the Tribunal with details of their losses (e.g. lost rent, advertising costs, an agent’s re-letting fee)
outline the steps they took to minimise their losses (e.g. advertising for a new tenant without delay).
In the meantime:
Keep negotiating. You may come to an agreement before the Tribunal hearing.
Claim your bond back. See Factsheet 03: Bond.