Diben yr ailbrisio fyddai ailgydbwyso’r dreth sy’n daladwy rhwng aelwydydd. Roedd yr ailbrisio diwethaf yng Nghymru yn 2003. Er bod gwerth cartrefi wedi cynyddu’n sylweddol ers hynny, byddai’r system yn un gymharol o hyd, felly ni fyddai gwerthoedd eiddo uwch o reidrwydd yn arwain at dreth gyngor uwch.
The purpose of the revaluation would be to rebalance the tax payable between households. The last revaluation in Wales was in 2003. While the value of homes has increased significantly since then, the system would remain a relative one, so increasing property values would not necessarily lead to increasing council tax.