How should an employer prepare the wage documentation?
The employer should preserve documentary evidence as to how a wage level was reached. This is easier if there is an official “wage scale” either as an official policy of the employer, or as part of a collective bargaining agreement. The factors that usually determine wage levels are job duties and job requirements (educational qualifications/experience and specialized knowledge). Though this information need not be submitted as part of the H1B Petition requirements, DOL can ask for this at any time.