If the landlord has served a valid section 21 notice and the sufficient notice period has passed, then the tenant must leave the property on the date specified in the notice so long as it is on or after the AST expiration date. If the tenant does not leave on this date, they put themselves at risk of being evicted.

If the landlord and tenant have entered into a new tenancy agreement, then the new tenancy will begin on the date specified in the agreement. This is not necessary for the reasons explained below.

It is usual for the landlord and tenant not to discuss what will happen after the AST expires. In these cases, the tenancy becomes a periodic tenancy. A periodic tenancy continues to renew itself on the same terms as the original agreement for a period equivalent to that of one rent payment each time. For example, the tenancy will continue month-to-month if rent is paid monthly.

This will continue indefinitely until one of the parties serves a notice to end the tenancy or if the parties decide to negotiate a new tenancy agreement. If the parties decide to negotiate a new tenancy agreement, it could mean a change in terms including the amount of rent.

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