Ill. Admin. Code tit. 86, § 153.115
a) the use of the watercraft is otherwise taxed under the Use Tax Act;
d) the watercraft is exempted from the numbering provisions of Section 3-12 of the Boat Registration and Safety Act [625 ILCS 45/3-12]. [35 ILCS 158/15-10] However, Watercraft Use Tax will become due on any watercraft that is exempted from the numbering provisions of paragraphs A, B, C, F, and G of Section 3-12 of the Boat Registration and Safety Act if that watercraft is used upon the waters of this State over 30 accumulated days in any calendar year. The following are the watercraft referred to in paragraphs A, B, C, F, and G of Section 3-12 of the Boat Registration and Safety Act to which the 30-day rule applies:
5) A watercraft that is competing in any race approved by the Department of Natural Resources under the provisions of Section 5-15 of the Boat Registration and Safety Act or a watercraft that is designed and intended solely for racing while engaged in navigation that is incidental to preparation of the watercraft for the race. Preparation of the watercraft for the race may be accomplished only after obtaining the written authorization of the Department of Natural Resources.
Example:
A watercraft that has a valid marine document issued by the United States Coast Guard and is used upon the waters of this State for 35 days in a calendar year is subject to Watercraft Use Tax. The tax applies even though the watercraft is not required to be registered under the Boat Registration and Safety Act until it has been used upon the waters of this State for more than 60 days in a calendar year. See subsection (d).
e) Other common exemptions:
The tax imposed by the Watercraft Use Tax Law does not apply if: