In his research in Tax Law, Borje Leidhammar collaborates with leading researchers in Sweden and abroad, including the European Association of Tax Law Professors. Leidhammar has with others writers written Legal Science opinions to the Swedish Tax Authorities and courts, articles, manuals and statutory commentaries in their subject area, including annual comments in the journal "SkatteNytt" regarding the Supreme Administrative Court tax procedural rulings, since 1992.
Current projects - Tax with special emphasis on tax procedure and tax evasion:
- Tax procedures in Sweden on the administrative level and in the national courts, together with the European Court and the European Court of Justice.
- Working with statutory commentaries and hand- and textbooks in the field. Plans for a more comprehensive study of the tax administrative penalty system under in 2013.
- Studies in the evaluation of evidence in matters of visibility in the tax law and the admissibility of evidence in cases of false invoices (together with other authors), books published by Norstedts Law 2010 respectively. 2011.