Final answer:
The contract described is an Advance Pricing Agreement (APA), which is an agreement between a taxpayer and the IRS that sets transfer pricing methods for certain transactions to prevent future adjustments, as long as the taxpayer complies with the terms of the agreement.
Step-by-step explanation:
The binding contract between the IRS and the taxpayer that you're referring to is called an Advance Pricing
Agreement (APA). An APA is a proactive agreement between a taxpayer and the IRS that determines an appropriate set of criteria for the determination of the transfer pricing for certain transactions over a fixed period of time.
This ensures that the IRS will not seek a transfer pricing adjustment as long as the taxpayer files its return adhering to the agreed transfer pricing method for the transactions covered by the APA.