35 Miss. Code R. § 3-01-01-100
"Gross income" means all income from whatever source derived, unless excluded by law and includes income realized in any form, whether in money, property or services. Gross income includes compensation for personal and professional services, wages, fees, business income, profits from sales, rentals and dealings in property, interest, dividends and gains, profits and income derived from any source whatever, including income from governmental agencies and subdivisions thereof, annuities, reacquired property, securities, insurance premiums, reinsurance premiums, considerations for supplemental insurance contracts, transactions of any business carried on within the state for gain or profit, income from intangibles if such property has acquired a business, commercial or actual situs in this state, a partner's distributive share of partnership gross income, income in respect of a decedent, and income from an interest in an estate or trust unless exempt or otherwise excluded, in whole or in part, from tax by law. Gross income, however, is not limited to the items so enumerated. In the case of a taxpayer reporting net income under this act on a basis of receipts and disbursements, there should be included in gross income only actual and constructive receipts of income. Taxpayers reporting on the accrual basis must include in gross income amounts received by them or accrued to them.
35 Miss. Code. R. § 3-01-01-100