The golden rule of every salary calculation in Serbia is as follows: the employer pays the salary exclusively based on your current data in the tax record, which they pull through an online connection and service (Tax Administration) from your file! If a child, a person with zero income, or a determined civil disability is not processed and registered by the worker in the centralized tax register, that attribute will not exist at all! Accounting departments are not allowed to touch this themselves. You must provide them with a valid and up-to-date new record!
Absolute recommendation. Today, hardly anyone physically goes to registration offices to register changes. The Tax Administration has integrated a very high-quality mechanism that saves you months of time in applications.
For those who do not use digital services, the procedure requires going to the competent branch of the Tax Administration according to your residence.
If you forgot to report the deduction on time, the state charged you more tax. However, it's not lost! The correction process happens through the annual personal income tax return where the Tax Administration can return the overpaid tax after processing all data.