Is it a breach of contract to tell the landlord to move one month in advance when the payment is 12 months?

1. is definitely a breach of contract (because the lease period is 12 months, if the lease period is 12 months, the deposit will be used as a penalty).

2. You can also tell the landlord to find the next tenant during my lease period and connect your lease period with you, so that you won't have any vacancies (if you move out, the liquidated damages will be regarded as the loss during the vacant period).

Most hosts will agree, but it depends on your host's personality. )

3. If the sublease must be stipulated in the contract, sublease is not allowed.

Feasible channel: talk to the landlord, you give him the next tenant and extend the lease. This is the only way not to deduct money.