Rule 80 defines the most appropriate method as the one best suited to the facts of each transaction that gives the most reliable measure of arm's length price, and lists six factors to weigh in choosing it.
80
Rules 2026 · Rule 80
Most appropriate method
Rules 77-130
The test (sub-rule 1). The most appropriate method is the one best suited to the facts and circumstances of the particular international transaction or specified domestic transaction, and which provides the most reliable measure of an arm's length price.
Factors (sub-rule 2).