{"id":9522,"date":"2021-02-19T10:47:07","date_gmt":"2021-02-19T10:47:07","guid":{"rendered":""},"modified":"2026-05-29T15:13:57","modified_gmt":"2026-05-29T14:13:57","slug":"datganoli-a-phwerau","status":"publish","type":"resource","link":"https:\/\/knowledgehub.cymru\/cy\/resources\/datganoli-a-phwerau\/","title":{"rendered":"Datganoli a phwerau"},"content":{"rendered":"<div class=\"wp-bootstrap-blocks-container container mb-2\">\n\t\n<div class=\"wp-bootstrap-blocks-row row\">\n\t\n\n<div class=\"col-12 col-md-9\">\n\t\t\t\n\n\n\n<h2 class=\"wp-block-heading\">Trosolwg<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"#cyflwyniad\" type=\"internal\" id=\"#introduction\">Cyflwyniad<\/a><\/li>\n\n\n\n<li><a href=\"#pwerau-deddfwriaethol\">Pwerau Deddfwriaethol<\/a><\/li>\n\n\n\n<li><a href=\"#pwerau-cyllidol\">Pwerau Cyllidol<\/a><\/li>\n\n\n\n<li><a href=\"#beth-mae-hyn-yn-ei-olygu-ir-sector-gwirfoddol\">Beth mae hyn yn ei olygu i&#8217;r sector gwirfoddol<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"cyflwyniad\">Cyflwyniad<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"devolution-process-not-an-event\">Proses yw datganoli, nid digwyddiad.Devolution is a process, not an event.<\/h3>\n\n\n\n<p>Wedi&#8217;i sefydlu ym 1999 fel Cynulliad Cenedlaethol Cymru, mae&#8217;r Senedd wedi ennill pwerau ychwanegol yn raddol. Parat\u00f4dd Deddf Llywodraeth Cymru 2006 y ffordd ar gyfer refferendwm yn 2011, lle roedd mwyafrif y pleidleiswyr yn cefnogi rhoi pwerau deddfu llawn i&#8217;r Cynulliad ar y pryd. <\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"650\" height=\"325\" src=\"https:\/\/knowledgehub.cymru\/app\/uploads\/2026\/04\/senedd-logo.jpg\" alt=\"Logo Senedd Cymru, Senedd Cymru y Deyrnas Unedig\" class=\"wp-image-23237\" srcset=\"https:\/\/knowledgehub.cymru\/app\/uploads\/2026\/04\/senedd-logo.jpg 650w, https:\/\/knowledgehub.cymru\/app\/uploads\/2026\/04\/senedd-logo-360x180.jpg 360w, https:\/\/knowledgehub.cymru\/app\/uploads\/2026\/04\/senedd-logo-624x312.jpg 624w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><\/figure>\n<\/div>\n\n\n<p>Datganolwyd pwerau ychwanegol o dan Ddeddf Cymru 2014 a Deddf Cymru 2017. Rhoddodd Deddf 2014 bwerau codi trethi i Gymru am y tro cyntaf. Symudodd Deddf 2017 Gymru o\u2019r model rhoi pwerau, lle gallai&#8217;r Senedd a Llywodraeth Cymru weithredu mewn meysydd datganoledig penodol yn unig, i fodel pwerau a gedwir yn \u00f4l, lle gall y Senedd ddeddfu ar unrhyw bwnc oni bai ei fod yn un a gedwir yn \u00f4l yn benodol i Senedd y DU.<\/p>\n\n\n\n<p>Yn etholiad nesaf y Senedd, sydd wedi&#8217;i drefnu ar gyfer Mai 2026, bydd y Senedd yn ehangu o 60 i 96 o Aelodau ac yn mabwysiadu system etholiadol newydd. Am ragor o wybodaeth, gweler ein heglurydd ynghylch diwygio etholiadol. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pwerau-deddfwriaethol\">Pwerau deddfwriaethol<\/h2>\n\n\n\n<p>Mae gan y Senedd a Llywodraeth Cymru bwerau mewn ystod eang o feysydd polisi, gan gynnwys:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>addysg<\/li>\n\n\n\n<li>iechyd<\/li>\n\n\n\n<li>trafnidiaeth<\/li>\n\n\n\n<li>cynllunio<\/li>\n\n\n\n<li>datblygu economaidd<\/li>\n\n\n\n<li>gofal cymdeithasol<\/li>\n\n\n\n<li>gofal cymdeithasol<\/li>\n\n\n\n<li>y Gymraeg<\/li>\n\n\n\n<li>yr amgylchedd<\/li>\n\n\n\n<li>amaethyddiaeth a materion gwledig<\/li>\n<\/ul>\n\n\n\n<p>Gallant gynnig polis\u00efau ym mhob un o&#8217;r meysydd hyn ac mewn unrhyw faes arall nad yw\u2019n faes a gedwir yn \u00f4l yn benodol i Lywodraeth y DU. Mae hyn yn cynnwys y gallu i wneud deddfau newydd, a elwir yn ddeddfwriaeth sylfaenol. Gellir cyflwyno cynigion ar gyfer deddfau newydd, a elwir yn filiau, trwy\u2019r canlynol:  <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Llywodraeth Cymru<\/li>\n\n\n\n<li>aelodau unigol y Senedd (ASau)<\/li>\n\n\n\n<li>pwyllgorau&#8217;r Senedd<\/li>\n\n\n\n<li>Comisiwn y Senedd<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1-1024x683.jpg\" alt=\"Dwylo person yn llenwi ffurflen ar fwrdd gyda graddfeydd a dogfennau arno\" class=\"wp-image-22264\" srcset=\"https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1-1024x683.jpg 1024w, https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1-720x480.jpg 720w, https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1-768x512.jpg 768w, https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1-1536x1024.jpg 1536w, https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1-360x240.jpg 360w, https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1-1800x1200.jpg 1800w, https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1-624x416.jpg 624w, https:\/\/knowledgehub.cymru\/app\/uploads\/2025\/12\/AB-Trust-1.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p>Rhaid i bob bil gael ei gymeradwyo gan y Senedd cyn dod yn gyfraith.<\/p>\n\n\n\n<p>Pan fydd deddfwriaeth sylfaenol yn cael ei phasio, gall gynnwys pwerau i Ysgrifenyddion a Gweinidogion Cabinet Llywodraeth Cymru wneud is-ddeddfwriaeth (eilaidd). Mae&#8217;r deddfau hyn yn cael eu gwneud o dan bwerau a ddirprwywyd gan y Senedd neu, mewn rhai achosion, Senedd y DU. Mae is-ddeddfwriaeth fel arfer yn cynnwys offerynnau statudol fel rheoliadau, gorchmynion, rheolau, cynlluniau, canllawiau, neu orchmynion lleol. Mae rhai o&#8217;r rhain angen cymeradwyaeth y Senedd.   <\/p>\n\n\n\n<p>Mae Senedd y DU yn cadw cyfrifoldeb am nifer o faterion a gedwir yn \u00f4l, gan gynnwys:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>amddiffyn a materion tramor<\/li>\n\n\n\n<li>plismona a chyfiawnder troseddol<\/li>\n\n\n\n<li>y cyfansoddiad<\/li>\n\n\n\n<li>cyfraith cyflogaeth<\/li>\n\n\n\n<li>rheoleiddio elusennau a chodi arian<\/li>\n\n\n\n<li>diogelu defnyddwyr<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pwerau-cyllidol\">Pwerau cyllidol<\/h2>\n\n\n\n<p>Mae Llywodraeth Cymru\u2019n cael ei chyllido drwy gyfuniad o:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>grant bloc blynyddol gan Lywodraeth y DU<\/li>\n\n\n\n<li>trethi Cymru<\/li>\n\n\n\n<li>pwerau benthyca cyfyngedig<\/li>\n<\/ul>\n\n\n\n<p>Mae&#8217;r grant bloc yn cael ei gyfrifo gan ddefnyddio Fformiwla Barnett. Yn 2024\u201325, roedd cyllideb Llywodraeth Cymru oddeutu \u00a323 biliwn. Nid yw&#8217;n ofynnol i Lywodraeth Cymru ddilyn cynlluniau gwariant Llywodraeth y DU a gall osod ei chyllideb ei hun, yn amodol ar gymeradwyaeth y Senedd.  <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fformiwla barnett<\/h3>\n\n\n\n<p>Mae <a href=\"https:\/\/commonslibrary.parliament.uk\/research-briefings\/cbp-7386\/\" target=\"_blank\" rel=\"noreferrer noopener\">Fformiwla Barnett<\/a> yn penderfynu sut mae newidiadau yng ngwariant Llywodraeth y DU yn Lloegr yn effeithio ar grant bloc Cymru. Os yw Llywodraeth y DU yn cynyddu neu&#8217;n lleihau gwariant mewn maes datganoledig, fel iechyd, mae Llywodraeth Cymru yn derbyn cynnydd neu ostyngiad cymesur mewn cyllid. Nid yw newidiadau gwariant mewn meysydd nad ydynt wedi&#8217;u datganoli, fel amddiffyn, yn effeithio ar y grant bloc.  <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pwerau treth<\/h3>\n\n\n\n<p>Yn dilyn Deddf Cymru 2014 a Deddf Cymru 2017, enillodd y Senedd a Llywodraeth Cymru reolaeth dros nifer o drethi Cymru, gan gynnwys:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Treth Gwarediadau Tirlenwi<\/li>\n\n\n\n<li>Treth Trafodiadau Tir (a elwid gynt yn Dreth Stamp)<\/li>\n<\/ul>\n\n\n\n<p>Mae Llywodraeth Cymru hefyd wedi cyflwyno trethi newydd yng Nghymru, fel yr Ardoll Ymwelwyr y cyfeirir ati yn aml fel y &#8216;dreth dwristiaeth&#8217;.<\/p>\n\n\n\n<p>Mae gan Gymru reolaeth rannol dros dreth incwm hefyd. Gall Llywodraeth Cymru amrywio cyfraddau treth incwm hyd at 10 ceiniog yn y bunt. Er enghraifft, gall osod y gyfradd sylfaenol unrhyw le rhwng 10c a 30c. Yn wahanol i&#8217;r Alban, ni all Cymru greu bandiau treth newydd na newid trothwyon. Hyd yn hyn, mae Llywodraeth Cymru wedi dewis cadw&#8217;r cyfraddau yn unol \u00e2&#8217;r rhai a osodwyd gan Lywodraeth y DU.    <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pwerau Benthyca<\/h3>\n\n\n\n<p>Ers 2014, mae Llywodraeth Cymru wedi gallu benthyca hyd at \u00a3500 miliwn i fynd i&#8217;r afael \u00e2 diffygion mewn refeniw treth datganoledig. Gall hefyd fenthyca hyd at \u00a31 biliwn ar gyfer buddsoddiad cyfalaf, gyda therfyn blynyddol o \u00a3150 miliwn. Gellir defnyddio benthyca cyfalaf ar gyfer prosiectau fel seilwaith newydd, adeiladu, neu gynnal a chadw sylweddol. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"beth-mae-hyn-yn-ei-olygu-ir-sector-gwirfoddol\">Beth mae hyn yn ei olygu i&#8217;r sector gwirfoddol<\/h2>\n\n\n\n<p>Wrth geisio dylanwadu ar lywodraeth, mae&#8217;n hanfodol deall pa lefel o lywodraeth sy&#8217;n gyfrifol am eich maes diddordeb. Mae&#8217;r rhan fwyaf o wasanaethau o ddydd i ddydd yng Nghymru, megis iechyd, tai, addysg, gofal cymdeithasol, a llywodraeth leol, wedi&#8217;u datganoli. Fodd bynnag, mae meysydd pwysig fel plismona, cyfiawnder troseddol, a lles yn feysydd a gedwir yn \u00f4l i Senedd a Llywodraeth y DU. Mae deall ble mae pwerau yn eistedd yn helpu i sicrhau eich bod chi&#8217;n cyfeirio eich ymdrechion dylanwadu at y lle iawn, gan arbed amser a chynyddu effaith.   <\/p>\n\n\n\n<blockquote class=\"wp-block-quote has-text-align-right is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-text-align-left\">Mae deall ble mae pwerau yn eistedd yn helpu i sicrhau eich bod chi&#8217;n cyfeirio eich ymdrechion dylanwadu at y lle iawn, gan arbed amser a chynyddu effaith.<\/p>\n<\/blockquote>\n\n\n\n<p>Mae hefyd yn bwysig ystyried pa mor hygyrch yw gwahanol sefydliadau. Yn gyffredinol, mae&#8217;r Senedd yn llai o faint ac yn fwy agored na Senedd y DU. Rydych yn llawer mwy tebygol o gwrdd \u00e2 Chadeirydd Pwyllgor y Senedd neu Ysgrifennydd Cabinet Cymru na rhai cyfatebol yn Llywodraeth y DU. Bydd ehangu&#8217;r Senedd ar \u00f4l etholiad 2026 yn debygol o greu cyfleoedd pellach i ymgysylltu.   <\/p>\n\n\n\n<p>Nid yw hyn yn golygu y dylech osgoi dylanwadu ar San Steffan. Yn hytrach, mae&#8217;n tynnu sylw at bwysigrwydd deall y gwahanol strwythurau a phwyntiau mynediad o fewn sefydliadau gwleidyddol Cymru a&#8217;r DU fel y gallwch deilwra&#8217;ch dull yn effeithiol. <\/p>\n\n\t<\/div>\n\n\n\n<div class=\"col-12 col-md-3\">\n\t\t\t\n\n\t<\/div>\n\n<\/div>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Mae Llywodraeth Cymru yn gyfrifol am y swyddogaethau a\u2019r pwerau a gaiff eu datganoli iddi gan y Goron ac mae ganddi gyllideb i weinyddu a darparu gwasanaethau cyhoeddus mewn ardaloedd datganoledig yng Nghymru. <\/p>\n","protected":false},"author":5934,"featured_media":9517,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[762],"tags":[726,776],"class_list":["post-9522","resource","type-resource","status-publish","format-standard","has-post-thumbnail","hentry","category-ymgysylltu-a-dylanwadu","tag-engagement-and-influencing","tag-lobbying-and-campaigning","pillar-ymgysylltu-dylanwadu"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Datganoli a phwerau | Adnoddau | Hwb Gwybodaeth<\/title>\n<meta name=\"description\" content=\"Mae deall ble mae pwerau yn eistedd yn helpu i sicrhau eich bod chi&#039;n cyfeirio eich ymdrechion dylanwadu at y lle iawn, gan arbed amser a chynyddu effaith.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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