Dydy treth ar dir gwag ar ei phen ei hyn yn ateb i'r argyfwng tai, wrth gwrs, ond fe allai helpu i gyflwyno datblygu amserol. Fel y mae ar hyn o bryd mae tirfeddannwr sy'n dal gafael ar dir a nodwyd ar gyfer datblygiadau'n arwain at elw preifat a chost gyhoeddus. Byddai treth ar dir gwag yn cymell gwaith datblygu ac yn creu cartrefi i bobl.
A vacant land tax alone is not the solution to the housing crisis, of course, but could help bring forward timely development. As it stands a landowner holding onto land identified for developments leads to a private gain and a public cost. A vacant land tax would incentivise development and create homes for people.