For both categories, the new salaries will be valid from 1st April 2000 and the raise will be payed retroactively. Minimal salaries should only be applied if the student is completely new at the department, has no experience, and doesn't teach. No tax is paid. Will not entitle you to a pension. The same for everybody, not negotiable.
Tax is paid.
Will entitle you to a pension. Tax is paid. Will entitle you to a pension. Half-time control does not automatically entitle to a pay raise since it's not an academical degree. However , remember that you're only supposed to have the minimal salary if you're completely new at the department, have no experience, and don't teach.