I just looked up "gross up salary" and this is the definition I got,

"To pay the full amount, without any deductions. This phrase is most frequently used in terms of salary; an employee can receive their salary grossed up, which means that they would receive the full salary promised to them, without deductions for tax. However, since salary must be taxed by law, the company would gross up the employee's salary so that after taxes they receive the full salary promised."

Basically, what they will offer me is the post-tax amount then?