Increasing the existing higher rates would also increase the tax on other types of transactions, including bridging between the purchase of a new home and the sale of a previous home.
Byddai cynyddu'r cyfraddau uwch presennol hefyd yn cynyddu'r dreth ar fathau eraill o drafodiadau, gan gynnwys pontio rhwng prynu cartref newydd a gwerthu cartref blaenorol.