According to USPAP, what happens if extraordinary assumptions are made in an appraisal?

When extraordinary assumptions are made in an appraisal, it is essential that they are documented and justified to maintain the credibility and transparency of the appraisal process. Extraordinary assumptions are conditions that, if proven to be false, could materially affect the appraisal's outcome. By documenting and justifying these assumptions, the appraiser provides a clear understanding of the basis upon which the value conclusion is reached.

This process helps ensure that users of the appraisal report are aware of the assumptions that have been made, allowing them to evaluate the reliability of the appraisal. It also serves as a safeguard for the appraiser, as it illustrates diligence and adherence to professional standards set forth by USPAP. Without proper documentation and justification, such assumptions could lead to questions about the appraisal's reliability and its compliance with USPAP standards.