Tax withholding (tax agent): what it means
A tax agent is the organisation, usually the employer, that takes tax out of your salary and pays it to the state. That is why an officially employed person often does not need to file a tax return: the tax is already paid.
Useful pages
Related terms
Income tax · Take-home pay (net salary) · Formal employment (job contract)
This is general information, not legal advice. Check the exact rules with an official source.