You may also be liable to further penalties under the Tax Collection and Management (Wales) Act (TCMA) 2016, such as penalties for inaccuracies in tax returns and failure to pay tax.
Gallwch hefyd fod yn agored i gosbau pellach o dan Ddeddf Casglu a Rheoli Trethi (Cymru) (DCRhT) 2016, megis cosbau am anghywirdebau mewn ffurflenni treth ac am fethu â thalu treth.