Mae nifer o eithriadau eisoes bremiymau’r dreth gyngor.  Er enghraifft, ni ellir codi premiwm ar eiddo sy'n destun amod cynllunio sy'n ei atal rhag cael ei feddiannu am gyfnod parhaus o o leiaf 28 diwrnod mewn unrhyw gyfnod o flwyddyn.
There are a number of existing exceptions from the council tax premiums. For example, properties which are subject to a planning condition preventing occupation for a continuous period of at least 28 days in any one-year period cannot be charged a premium.