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(b) the transaction giving rise to the intangible expense or cost between the taxpayer and the person did not have as a principal purpose the avoidance of Illinois income tax, and is paid pursuant to a contract or agreement that reflects arm's-length terms; or (iii) any item of intangible expense or cost paid, accrued, or incurred, directly or indirectly, from a transaction with a person if the taxpayer establishes by clear and convincing evidence, that the adjustments are unreasonable; or if the taxpayer and the Director agree in writing to the application or use of an alternative method of apportionment under Section 304(f); For taxable years ending on or after December 31, 2025, this paragraph shall not apply to the following: (i) any item of intangible expense or cost paid, accrued, or incurred, directly or indirectly, if the taxpayer can establish, based on a preponderance of the evidence, both of the following: (a) the person during the same taxable year paid, accrued, or incurred, the intangible expense or cost to a person that is SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468