“Gross income” means all compensation for services including fees, commissions, and similar items, except as otherwise provided by this division. “Gross income” shall specifically include those items relating to compensation specified by Article 2 (commencing with Section 17081) of, and shall specifically exclude those items relating to compensation specified by Article 3 (commencing with Section 17131) of, Chapter 3 of Part 10 of Division 2 of the Revenue and Taxation Code.