Fel rhan o'r fframwaith cyllidol, ymrwymodd Llywodraeth Cymru i roi trefniadau ar waith i lunio rhagolygon annibynnol ar gyfer refeniw trethi datganoledig. Tra bo'r trefniadau hyn yn cael eu sefydlu, ceir proses dros dro o graffu a sicrwydd ar gyfer rhagolygon refeniw trethi Llywodraeth Cymru.
As part of the fiscal framework the Welsh Government committed to putting in place arrangements for the independent production of tax revenue forecasts for devolved taxes. While those arrangements are being established, there is an interim process of independent scrutiny and assurance of Welsh Government tax revenue forecasts.