This question really asks what percent of the contingent fee (typically one-third) is paid by the employee and what percent is paid by the workers' compensation insurer. When workers' compensation insurers try to have the employee pay the full attorney fee, petitions so drafted are not approved.

Practice Note:

There is a Section 15 Interactive Petition v.2.62  xls format of Section 15 Petition
that includes a Section 15 Calculator Version 8.5  xls format of Section 15 Calculator Version 8.5
- an immense help to those who do not do this work often.