(1) A noncompetition covenant is void and unenforceable:

(a)(i) Unless the employer discloses the terms of the covenant in writing to the prospective employee no later than the time of the initial oral or written acceptance of the offer of employment and, if the agreement becomes enforceable only at a later date due to changes in the employee's compensation, the employer specifically discloses that the agreement may be enforceable against the employee in the future; or

(ii) If the covenant is entered into after the commencement of employment, unless the employer provides independent consideration for the covenant;

(b) Unless the employee's earnings from the party seeking enforcement, when annualized, exceed one hundred thousand dollars per year. This dollar amount must be adjusted annually in accordance with RCW 49.62.040;

(c) If the employee is terminated as the result of a layoff, unless enforcement of the noncompetition covenant includes compensation equivalent to the employee's base salary at the time of termination for the period of enforcement minus compensation earned through subsequent employment during the period of enforcement.

(2) A court or arbitrator must presume that any noncompetition covenant with a duration exceeding eighteen months after termination of employment is unreasonable and unenforceable. A party seeking enforcement may rebut the presumption by proving by clear and convincing evidence that a duration longer than eighteen months is necessary to protect the party's business or goodwill.