Most tenancies typically require a deposit to be paid at the outset to be held as security against damages or unpaid rent or charges at the end of the tenancy. Security deposits must be adequately protected in recognised tenancy deposit protection schemes.
When creating a new tenancy, you can complete the Security Deposit field in the Tenancy Details section, which will create a security deposit record relating to that tenancy.
If you haven't specified the deposit due during the tenancy creation stage, you can do so afterwards via the Rent & Charges > Security Deposit menu. Click Add Deposit Due, and provide details of the deposit total. The deposit will be due on the tenancy start date.
The deposit due will then show on the tenancy overview screen along details of any payments received towards it.