Section 317A.140 - Accounting; installment payment; rules(1) Subject to rules adopted by the Department of Revenue, the corporate activity tax imposed under ORS 317A.116 becomes payable in accordance with the system of accounting regularly employed by the taxpayer.(2) In the case of a lease, contract, sale or arrangement described in section 4216(c) of the Internal Revenue Code, rules similar to the rules of section 4217(e)(2) of the Internal Revenue Code shall apply for purposes of the corporate activity tax.(3) A person is entitled to a credit or refund for taxes previously paid on debts that are deductible under section 166 of the Internal Revenue Code.