A "tenancy deposit" means money that is held (by the landlord or someone else) to ensure that a tenant:
1.follows their responsibilities, or
2.pays for any damage or debt related to the tenancy.
Your "tenancy deposit" cannot usually be more than 5 weeks rent. To calculate your maximum "tenancy deposit", you can do the following sum: monthly rent x 12 ÷ 52 x 5.