Final answer:
The proper form for dual dating an auditor's report when a stock split occurs after the original report date but is included in the financial statements is 'January 30, 2015, except as to Note X, which is dated February 5, 2015'. This reflects the completion date of the audit and the specific date related to the stock split.
Step-by-step explanation:
When an auditor has completed an audit and dated their report, but then becomes aware of an event that occurred after that date which is reflected in the financial statements, they may dual date their report. This means the auditor's report will reflect one date for the overall audit, and a different, later date for the specific event or subsequent information that was not known at the time of the original audit report.
In the scenario presented, the correct form for dual dating due to a stock split that occurred after the auditor's report but was included in the financial statements would be: January 30, 2015, except as to Note X, which is dated February 5, 2015. This indicates that the auditor gathered sufficient appropriate evidence by January 30, but the note regarding the stock split, an event known later, is specifically dated on the day the stock split was voted on by the board of directors.