Pembrokeshire, Carmarthenshire, Anglesey, Conwy, Ceredigion, Powys, Gwynedd and Flintshire are the first Welsh Local Authorities looking at implementing a 50% council tax premium on empty and second homes for 2017/18. Councils must make the declaration by 1st April 2016 to begin charging in 2017/18.
http://www.walesonline.co.uk/news/wales-news/second-home-owners-face-council-10954224
http://www.bbc.co.uk/news/uk-wales-35631009