Thats why you have to read and know the Residential Tenancies Act (RTA) for your state
Most jurisdictions stipulate how the security deposit is handled
Ours must be placed in a trust account
QLD has a government department with which the bond must be lodged within ten days
If you miss the regulation by 1 day, the tenants lease is invalidated and when they trash the place you have no comeback
If you go on 'common sense' one proffessional tenant will wipe the floor with you, there isnt much common sense in the RTA for any state province or territory.
Some stipulations in NSW make no sense at all,
read NSW RTA, scary, it was made retroactive to pre-existing and TERMINATED lease contracts, some old tenants could come back and ask for damages
NSW dept of stupidity said:
(1) A residential tenancy agreement must not contain a term of a kind set out in this section or prescribed by the regulations for the purposes of this section.
(2) Terms having the following effects must not be included in a residential tenancy agreement:
//SNIP//
(e) that, if the tenant does not breach the agreement, the rent is or may be reduced or the tenant is to be or may be paid a rebate of rent or other benefit.
//snip//
paragraph 2e, you cant give the tenant a bonus for being a good tenant
other benefit was stated in face to face talks to the NSW RTA when we were residing in QBN to include a box of quality street at Christmas, unless you gave one to all your bad tenants as well