A deposit arrangement entered into with an insurance company, which guarantees both the principal and interest repayments. It is a type of annuity contract, not a marketable security. The amount deposited can be a single sum or a stream of monies deposited over a specified and limited period of time. Similarly, the deposit plus the guaranteed interest paid thereon can be repaid in a single sum or installments. Expenses related to the contract arrangement can be charged against the guaranteed interest payments or paid separately by the contract holder.