Mae Datganiad yr Hydref yn dangos bod sefyllfa’r economi a chyllid cyhoeddus wedi gwella o’i chymharu â’r hyn a ddisgwylid adeg y Gyllideb ym mis Mawrth. Ond er hynny, mae’r economi yn wannach o lawer na’r hyn a ddisgwyliai Llywodraeth y DU pan lansiodd ei chynllun cyni ariannol ym mis Mehefin 2010. Erbyn 2015/16, mae disgwyl i’r economi fod wedi crebachu bron 7% o’i gymharu â’r hyn a ddisgwylid yn 2010, o’i mesur yn ôl CMC. Mae disgwyl i’r diffyg yn y gyllideb fod bron £60 biliwn yn uwch, ac mae disgwyl i’r ddyled gyhoeddus net fod £135 biliwn yn uwch.
While today’s Autumn Statement shows that the economy and public finances have improved relative to expectations at the time of the March Budget, the economy is much weaker than the UK Government expected when it launched its fiscal austerity plan in June 2010.  By 2015-16, the economy as measured by GDP is now expected to be close to 7% smaller than expected in 2010. The budget deficit is expected to be almost £60 billion higher and net public debt is expected to be £135 billion higher.