How can I decrease my tax rate?
If your income is considerably lower or your deductions are considerably higher than what is stated on the tax decision enclosed with your tax card, you can request a lower tax rate online or at a tax office.
See the guidance for using MyTax: How to order a tax card in MyTax
If you do not request a decreased tax rate, all the excess taxes withheld from your income due to your high tax rate will be refunded to you with interest. Even if you request the change later in the year, you will receive the same benefit during 2019.