Disclaimer: The below is not legal advise, - you should always consult with your locale tax office about how to obtain a tax deduction
You can get a tax deduction when donating to Norwegian charity by writing in your Norwegian social security number when you make you donation. We will then pass this and your other informations on to the charity you donated to (and no one else!) and they will then report the donation to the Norwegian tax authorities.
Only if you donate above 500 NOK to one organization throughout the year are you granted a tax deduction. You can be granted a maxim of 12.000 NOK in tax deductions.
You can read much more here: http://www.skatteetaten.no/no/Bedrift-og-organisasjon/Rapportering-...