Fel y nodwyd, gwneir y Rheoliadau HIA drwy arfer y pwerau a roddir i'r Ysgrifennydd Gwladol gan y Ddeddf.Bydd y prif bŵer galluogi i'w weld yn adran 2 o'r Ddeddf. O dan adran 2A o'r Ddeddf caiff Gweinidogion Cymru hefyd,  drwy reoliadau, wneud darpariaethau penodol sy'n gyfwerth â'r rheini y caiff yr Ysgrifennydd Gwladol eu gwneud drwy ddefnyddio adran 2, er ni chânt wneud yr holl ddarpariaethau, a dim ond pan fo darpariaeth ym maes lle y mae cymhwysedd wedi ei ddatganoli y cânt ei gwneud.
As stated, the HIA Regulations will be made in exercise of powers conferred on the Secretary of State by the Act. The main enabling power will be contained in section 2 of the Act. Under section 2A of the Act the Welsh Ministers may also make certain provision by regulations equivalent to that which the Secretary of State can make using section 2, although not all provision and only where the provision is within devolved competence.