In case you receive this letter you need to take action within three months even if you incorrectly received the letter from the CAK or you will receive a fine. The fine will increase after three months.
The CAK letter is not correct
Apply for an assessment of your insurance position at the SVB and inform CAK of the outcome.
The CAK letter is correct
Take a Dutch basic health insurance as soon as possible and inform the CAK.
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Further information about the requirements concerning Dutch health insurance can be found here.