The Lorentz Casimir Lyceum asks the parent (s) / caregiver (s) of the pupils to provide a voluntary parental contribution to finance activities and facilities not paid by the government but seen by the school as an important supplement to our education. The table below shows the amounts of voluntary parental contribution:
| Excursions | € 30,00 |
| General matters: extracurricular activities (cultural, sport, Olympics), parent committee, student council | € 40,00 |
| Total | € 70,00 |
| Yearbook contribution (havo 5 and vwo 6 only) | € 18,00 |
| Introduction contribution (secondary class only) | € 35,00 |
| Foreign travel | Variable |
For (foreign) travel, parents are asked to make a voluntary contribution to organise these trips cost-effectively. If this voluntary contribution is not sufficient for parents, the school may choose not to continue travelling.
Examination fees for enhanced language learning Cambridge and DELF Scolaire do lead to a compulsory contribution by parents/carers in participation. The student can choose to participate. The examination fees are paid by the school to the institution which takes the examinations.
Invoicing of the voluntary parental contribution takes place via the WisCollect digital billing system in October. All other activities (such as foreign travel, exam fees Cambridge and Delf Scolaire) are billed separately via WisCollect. All contributions are voluntary except Cambridge and DELF Scolaire exams.