Specified covered services.
(i) Specified covered services. Specified covered services are controlled services transactions that the Commissioner specifies by revenue procedure. Services will be included in such revenue procedure based upon the Commissioner's determination that the specified covered services are support services common among taxpayers across industry sectors and generally do not involve a significant median comparable markup on total services costs. For the definition of the median comparable markup on total services costs, see paragraph (b)(3)(ii) of this section. The Commissioner may add to, subtract from, or otherwise revise the specified covered services described in the revenue procedure by subsequent revenue procedure, which amendments will ordinarily be prospective only in effect.