12 March – After the confrontation of December 2008 over euthanasia, the constitution of Luxembourg is amended to change the Grand Duke's power as from 'promulgating' law to 'sanctioning' law: removing his veto.
13 March - Luxembourg announces that it will provide details of private bank clients to foreign tax authorities if 'concrete proof' of tax evasion is provided.
17 March – Following the constitutional amendment, the Chamber of Deputies votes 30–26 to legalise euthanasia. The Grand Duke refuses to sign the law, but no longer has the power to veto it.
20 May - Luxembourg and the United States sign a tax treaty, pledging to exchange private bank client details upon request: the first Luxembourg has signed with an OECD country.