; and (ii) ending on the date on which such trade or business has resumed significant operations at such principal place of employment. Such term shall include wages paid without regard to whether the employee performs no services, performs services at a different place of employment than such principal place of employment, or performs services at such principal place of employment before significant operations have resumed. (3) Certain rules to apply For purposes of this subsection, rules similar to the rules of sections 51(i)(1), 52, and 280C(a), of the Internal Revenue Code of 1986, shall apply. (4) Employee not taken into account more than once An employee shall not be treated as an eligible employee for purposes of this subsection for any period with respect to any employer if such employer is allowed a credit under section 51 of the Internal Revenue Code of 1986 with respect to such employee for such period. (c) Employee retention credit for employers affected by California wildfires (1) In general For purposes of section 38 of the Internal Revenue Code of 1986, in the case of an eligible employer, the 2018 California wildfire employee retention credit shall be treated as a credit listed in subsection (b) of such section. For purposes of this subsection, the 2018 California wildfire employee retention credit for any taxable year is an amount equal to 40 percent of the qualified wages with respect to each eligible employee of such employer for such taxable year. For purposes of the preceding sentence, the amount of qualified wages which may be taken into account with respect to any individual shall not exceed $6,000. (2) Definitions For purposes of this subsection— (A) Eligible employer The term eligible employer means any employer— (i) which conducted an active trade or business on July 23, 2018, in the California wildfire disaster zone