The employment agreement as a volunteer worker is the document that stipulates that the non-profit organization is employing the individual who offers to do a job voluntarily and in turn agrees to faithfully watch over the functioning of the organization.

This document establishes certain terms and conditions, which both the organization (employer) and the person assigned to receive compensation (employee/volunteer) must comply, such as: Ministerial compensation (salary), responsibilities or obligations, confidentiality of the organization's internal information, right to vacations, ministerial compensation, among other terms.
 
This documentation is extremely important since it protects the employee (volunteer) from possible defamation or lawsuits by a third party alleging that said person is benefiting or profiting from the entity; taking into account that it is a non-profit organization.