Each carrier and employer shall provide the employer's federal tax identification number on: (1) the employer's first report of injury; (2) the employer's supplemental report of injury; (3) the wage statement; (4) a Form A-1, A-2, and A-4 (initial filing only); (5) a statement of controversion; (6) a notice that employer has become subscriber, Form IAB-20; (7) a cancellation or nonrenewal notice for workers' compensation insurance, Form IAB-9; and (8) other forms as the board shall direct (effective 1987).
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