Yn 2014-15, codwyd £170m trwy dreth dir y dreth stamp yng Nghymru, a chafwyd 55,000 o drafodiadau. Disgwylir i hyn godi i  £244m erbyn 2018-19. Os caiff y Bil ei basio, bydd y dreth trafodiadau tir yn disodli treth dir y dreth stamp yng Nghymru fis Ebrill 2018.
In 2014-15, £170m was raised from stamp duty land tax in Wales, with 55,000 transactions taking place. This is expected to rise to £244m by 2018-19. If the Bill is passed, land transaction tax will replace stamp duty land tax in Wales in April 2018.