When a taxable gift in the form of cash, stocks, real estate, or other tangible or intangible property is made, the tax is usually imposed on the donor (the giver) unless there is a retention of an interest which delays completion of the gift. A transfer is "completely gratuitous" when the donor receives nothing of value in exchange for the given property. A transfer is "gratuitous in part" when the donor receives some value but the value of the property received by the donor is substantially less than the value of the property given by the donor. In this case, the amount of the gift is the difference.