Mae rôl y Comisiynwyr wrth bennu eu cyllideb flynyddol a’u praesept treth gyngor yn rôl y maent yn atebol yn uniongyrchol amdani i’w hetholaethau.  Gan ymgynghori â’u Prif Gwnstabliaid a’r cyhoedd, rhaid i bob Comisiynydd amlinellu Cynllun Heddlu a Throseddu pum mlynedd sy’n cymryd amgylchiadau lleol i ystyriaeth.  Mae gan y Comisiynwyr bwerau i ddosbarthu grantiau a darperir gan y llywodraeth ganolog er mwyn darparu gwasanaethau’r heddlu ac i gefnogi blaenoriaethau lleol.
The role of the Commissioners in setting their annual budget and local Council Tax precept is one for which they are directly accountable to their electorates.  In consultation with their Chief Constable and the public, each Commissioner must set out a five-year Police and Crime Plan taking account of local circumstances.  The Commissioners have powers to distribute grants provided by central government for the delivery of police services and to support local priorities.