In the United States, a master limited partnership (MLP) or publicly traded partnership (PTP) is a publicly traded entity taxed as a partnership. It combines the tax benefits of a partnership with the liquidity of publicly traded securities. To obtain the tax benefits of a pass through, MLPs must generate at least 90% or more of their income from qualifying sources such as from production, processing, storage, and transportation of depletable natural resources and minerals. In addition, real property rents also qualify.