The Danish income tax system is a tad complicated to say the least and there are a bunch of variants one should consider during calculations: Arbejdsmarkedsbidrag 8%, state income tax (5.83% and 15%), municipal income tax (23-28%), state tax (8-15%)...
Safe to say, I've cut a few corners.
Calculations are based on a Deloitte .pdf I randomly stumbled upon that used Copenhagen as an example.
See 'How is this calculated?' for more details.