INCREMENT VALUE DUTY. A duty called by this name was first imposed by the Parliament of the United Kingdom in 191o, the tax being one of the highly controversial measures con tained in the Finance Act 1909-1 o. The rate of duty was one pound for every complete five pounds of the "increment value" of any land accruing (a) on a sale, or on a lease (other than a mining lease, and other than a lease for a term not exceeding 14 years); (b) on a succession on the death of the owner; (c) on a valuation made every 15th year in the case of land held by permanent corporations. Increment value was defined as the amount by which the site value of the land as defined in the Act should exceed the original site value as ascertained under the provisions of the Act as to valuation. The administration of the tax was entrusted to the Commissioners of Inland Revenue, who were directed "as soon as may be after the passing of the Act" to cause a valuation to be made of all land in the United Kingdom, showing (a) the "site value," and (b) the total value, of the land. The "site value" was to be the value of the land exclusive of buildings and other improvements, which were taken into ac count in estimating the total value. The "original site value" was the value of the land without improvements on April 3o, 1909. The duty was not imposed in respect of agricultural land while the land had no higher value than its market value for agricultural purposes ; or in respect of houses of a limited annual value when occupied by the owner; or in the case of agricultural land not exceeding so acres in area and .175 per acre in value, when cultivated by the owner. One half of the proceeds of the duty was appropriated for the benefit of local authorities in the United Kingdom in such manner as Parliament might determine. The increment value duty did not fulfil the hopes of the pro moters of the legislation, and was, together with the other "land values duties," i.e., the reversion duty and the undeveloped land duty, repealed by Section 57 of the Finance Act 192o. (See also LAND TAXES ; UNEARNED INCREMENT.) (J. S. S.)