Compensation and qualifying knowledge are different parts of the record.
Explain the expertise rather than the pay label
Show the company knowledge actually held and its relevance to the US assignment. A salary increase does not buy eligibility or replace the qualifying employment evidence; official immigration charges are a separate budget item.
Treat compensation as background evidence, not the legal test. Review what proprietary product, process, or procedure the employee understands, how that knowledge was acquired, why it is special or advanced within the organization, and exactly how the US assignment will use it. A raise may reflect seniority, market conditions, retention, or broader responsibility without proving L-1B knowledge. The employer must separately document the qualifying corporate relationship, active operations, and one continuous qualifying year abroad within the preceding three years. If work occurs at an unaffiliated customer site, confirm that the petitioner controls it and that the arrangement is not labour-for-hire. Budget government filing charges, professional work, travel, and salary independently, checking current official fees rather than implying higher pay purchases a favourable decision. Prior L periods must fit the five-year L-1B maximum.
Hypothetical example: A Sainte-Rose-du-Nord packaging-machine calibration specialist receives a substantial increase after taking night-shift responsibility. Her evidence focuses on mastery of the employer’s proprietary sensor-tuning sequence and its use for the related US entity. Payroll records explain the change, but the increase is never offered as a proxy for specialized knowledge.