Change to your married name
If you have a NemID, you can apply to change to your married name on borger.dk (click "apply here" in the green box below).
For your married name to appear on your marriage certificate on your wedding day, you should submit your application at least 15 days before the wedding.
It is free to change to your married name up to 3 months after the wedding. After that period, it will cost you an administrative fee of DKK 500 (2019).