Permanent establishment rules define fixed place and activity thresholds that determine taxable presence when exceeded. A permanent establishment is a fixed place of business through which an enterprise's business is carried on, including management offices, branches, factories, sales outlets, warehouses, agricultural sites and resource extraction locations. Temporary building or construction projects and service provision by enterprise personnel become a permanent establishment when they exceed specified duration thresholds. Exclusions cover purely storage, display, delivery, stock maintenance for processing, purchasing, information collection, and preparatory or auxiliary activities. Dependent agents with contract authority or habitually securing orders, and insurance enterprises collecting premiums or insuring risks via non independent agents, can create a permanent establishment; independent agents acting in the ordinary course of business do not.