Fe wnaeth adolygiad Diamond fodelu ystod o drothwyon incwm ar gyfer y rheini sy'n gymwys i gael cymorth ariannol yn seiliedig ar brawf modd. Mae Llywodraeth Cymru wedi pennu £59,200 fel y trothwy incwm uchaf.  Mae'r ffigur hwn yn gynnydd o tua £8,000 o'i gymharu â'r trefniadau presennol.
The Diamond review modelled a range of household income thresholds for those eligible for means-tested support. The Welsh Government has decided to set the upper threshold at £59,200. This is an increase of around £8,000 on current arrangements.