Must Article 29(1) of Council Regulation (EC) No 73/2009 of 19 January 2009 establishing common rules for direct support schemes for farmers under the common agricultural policy and establishing certain support schemes for farmers, amending Regulations (EC) No 1290/2005, (EC) No 247/2006, (EC) No 378/2007 and repealing Regulation (EC) No 1782/ 2003, be interpreted as allowing, in principle, a Member State to apply income tax to payments under the support schemes listed in Annex I to that regulation?