The collective agreement or TES (työehtosopimus) determines what you will be paid for working. Check your collective agreement to see how your wages are determined. The collective agreement applied at your workplace must be mentioned in your employment contract. You can also ask your union representative which collective agreement the workplace applies.
In the social services, health and early childhood education sector, wages rarely only consist of basic pay. Bonuses and compensation are a large part of your livelihood.