There is no universal requirement to purchase an external report for an L-1B case. First assess whether the employer’s own credible records and knowledgeable explanations establish the distinction between common skills and specialised knowledge.
Purchase only useful support
If outside analysis is considered, define the factual gap it will address and what evidence the author can actually evaluate. Keep that expense separate from official filing charges, applicable supplements, optional premium processing and legal preparation. A report cannot replace missing qualifying employment or an unsupported U.S.
assignment, and its price is not evidence of eligibility. Commission an outside opinion only where it answers a question the internal record cannot. Where the issue is what the employee knows and how they came to know it, the organization's own people are usually better placed than an external expert, and their account costs nothing beyond their time.
An outside view may help where a genuinely technical proposition needs independent explanation to a non-specialist reader. Ask any prospective expert what they would examine, what they would be able to say, and whether they would qualify their view — an opinion that simply repeats the company's assertions in more formal language adds cost rather than weight. Verify government charges against the actual petitioner and filing type including any applicable supplemental fee, and treat the expert question as separate from them.