The NDR bill for each property is calculated by taking its RV and multiplying it by the ‘NDR multiplier' for the year in question.
Caiff y bil ardrethi annomestig ar gyfer pob eiddo ei gyfrifo drwy gymryd ei werth ardrethol a'i luosi â'r ‘lluosydd ardrethi annomestig' ar gyfer y flwyddyn dan sylw.