280-20-20 R.I. Code R. § 12.10
In any taxable year the gain or loss entering into the computation of federal taxable income from the sale or other disposition of property before the end of its useful life on which a research and development deduction has been allowed, shall be disregarded in computing entire net income and there shall be added to or subtracted from the portion of entire net income allocated within the state the gain or loss upon such sale or other disposition. In computing such gain or loss the basis of the property sold or disposed of shall be adjusted to reflect the research and development deduction allowed under R.I. Gen. Laws § 44-32-1. No loss will be recognized with respect to a sale or other disposition of qualified property to a taxpayer whose acquisition thereof is not a purchase as defined in section 179(d) of the Internal Revenue Code ( 26 U.S.C. § 179(d).
280 R.I. Code R. § 280-RICR-20-20-12.10