We have just created an extension for MAF Norge that produces an XML file for the tax authorities with the deductible amount for the year for each donor. With a little configuration customization (detailed in the documentation on GitHub) it can be used by any Norwegian organization that has to produce this file every year. MAF Norge is currently testing the extension. It can be found in the extension list on this website: https://civicrm.org/extensions/yearly-tax-declaration-donors-norwegian-xml-format and on Github: https://github.com/CiviCooP/no.maf.oppgavexml
Thanks to MAF Norge for funding this development!
Extension can be used and modified as you like, we will only maintain the requirements from MAF Norge at this point in time.