Where aid is granted on the basis of standard costs or additional costs and income foregone in accordance with points (a) and (b) of Article 21(1),as regards income foregone and maintenance costs, and with Articles 28 to 31, 33, and 34, Member States shall ensure that the relevant calculations are adequate and accurate and established in advance on the basis of a fair, equitable and verifiable calculation method.
I gcás gur ar bhonn costais chaighdeánacha nó costais bhreise agus ioncam tarscaoilte a dheonófar cabhair i gcomhréir le pointe (a) agus pointe (b) d'Airteagal 21(1) maidir le hioncam tarscaoilte agus costais chothabhála, agus i gcomhréir le hAirteagal 28 go hAirteagal 31, Airteagal 33 agus Airteagal 34, áiritheoidh na Ballstáit go mbeidh na ríomhanna ábhartha leormhaith agus beacht agus bunaithe roimh ré ar bhonn modh ríomha atá cóir, cothrom agus infhíoraithe.