To the best of my knowledge your depost must be placed in an interest bearing account beginning with the second year. The interest should accrue to the benefit of the tenant, whose money it is. You should ask the landlord for an acccounting of the funds, and to know the name of the institution and account number which the funds were held. The interest rates will vary depending on what year, most landlords keep these funds in simple savings accounts designated as escrow accounts. The interest in the last few years has been negligible, but it still belongs to you whatever it amounts to. You should have had better rates in the earlier years, and of course it would be compounding. The landlord is still able to attach these funds (debit from the total) for any damages under the terms of the lease. We put the accounts in joint names (mine and theirs/escrow) so the interest accrues to the tenant and they are responsible for the taxes on it over the years. Good luck!