Mae’r amcanion sydd wrth wraidd codi treth gyngor uwch ar eiddo gwag hirdymor yn glir. Mae cartrefi gwag yn adnodd tai y dylid dechrau ei ddefnyddio unwaith eto, yn enwedig ar adeg pan mae angen mwy o gartrefi fforddiadwy. Maent hefyd yn gallu denu ymddygiad gwrthgymdeithasol a chael effaith andwyol ar yr amgylchedd, ac yn gallu arwain at drobwll o ddirywiad mewn rhai cymunedau.
The objectives of charging higher council tax on long-term empty properties are clear. Empty homes are a housing resource that should be brought back into use, particularly at a time when more affordable homes are needed.  They can also be a magnet for anti-social behaviour and can have an adverse effect on the environment and can lead to a spiral of decline in certain communities.