Bydd newidiadau i’r fformiwla ar gyfer dyrannu Cronfeydd Strwythurol i ranbarthau tlotaf, neu “lai datblygedig” yr UE, fel Gorllewin Cymru a’r Cymoedd, yn cael effaith anghymesur ar rai o’n cymunedau mwyaf bregus. Bydd Gorllewin Cymru a’r Cymoedd (a Chernyw) yn colli arian i ranbarthau cyfoethocach, gan gynnwys y rhai o fewn y DU. Ar gyfer Gorllewin Cymru a’r Cymoedd, byddai’r cytundeb yn golygu gostyngiad o tua £400m ar gyfer 2014-2020 o’i gymharu â’r cyllid a gafwyd ar gyfer 2007-2013 – byddai’r ffigwr hwn wrth gwrs yn llawer uwch mewn termau real. Mae hyn yn groes i amcan yr UE, a osodwyd yn y Cytuniadau, i leihau’r gwahaniaethau incwm ar draws yr Undeb.
Changes to the formula for the allocation of Structural Funds to the poorer, or “less developed” regions of the EU such as West Wales and Valleys, will have a disproportionate impact on some of our most vulnerable communities. West Wales and the Valleys (and, also, Cornwall), will lose out to wealthier regions, including those within the UK. For West Wales and the Valleys, the agreement would mean a reduction of some £400m for 2014-2020 compared to the funding for 2007-2013 – this figure would be much greater of course in real terms. This is contrary to the EU’s objective, as set out in the Treaties, to narrow income differentials across the Union.