If you are applying for the same name
Your application is free of charge if you apply for a "shared" name e.g., you are applying for each other's surname or middle name with or without a hyphen.
To get the name change free of charge, you must however apply within three months after the date of your wedding.
If you are not applying for the same name
If you do not apply for a "shared" name, you have to pay a fee.
Example: you want to change your first name or delete your middle name at your marriage, but you are not applying for a middle name or surname from your future spouse. In this case, you must apply for a regular change of name with a fee.