Having processed your personal tax filing, the Dutch tax authority (Belastingdienst) will let you know how much tax you need to pay.
If you need assistance in reviewing your tax assessment (belastingaanslag), then this service is for you.
Having processed your tax filing, the tax authority will inform you in detail about your tax liability.
If you have filed prior to 1 April, you can expect to hear about your tax assessment (belastingaanslag) no later than 1 July. There may be grounds to formally object to the assessment (bezwaar indienen) in which case you will need to detail your objection – usually with supporting explanation and/or evidence – and request to the tax authority to reconsider your assessment based on the new information.