Cafodd etholiadau Cynlluniad Cenedlaethol Cymru ei chyfuno efo’r etholiad ar gyfer Comisiynwyr yr Heddlu a Throseddu yng Nghymru. Mae’r data cyhoeddedig yn adlewyrchu costau etholiadau Cynulliad Cenedlaethol yn unig. Ymhlith pethau eraill mae’r data’n cynnwys costau'r safle llogi, argraffu cardiau a phapurau pleidleisio a chostau staff. Nid yw’n cynnwys costau sy’n cael ei thalu’n uniongyrchol o Gronfa Gyfunol Cymru, megis cardiau post gan ymgeiswyr, cyfanswm hyn yw £3,882,615.03.
The 2016 National Assembly elections were combined with the election of Police and Crime Commissioners in Wales. The published data reflects the costs of the National Assembly election only. The data includes, amongst other things, the costs of the hire of premises, printing poll cards and ballot papers and staff costs. It does not include costs paid directly out of the Welsh Consolidated Fund such as postal costs for candidate mail shots, this amounted to £3,882,615.03.