Once you submit your return, to pay you’ll need to use your 12-digit Unique Transaction Tax Reference Number (UTRN) from your online account.
Ar ôl i chi gyflwyno’ch ffurflen, i dalu bydd angen i chi ddefnyddio’ch Cyfeirnod Unigryw Treth Trafodiad (CUT) 12 digid o’ch cyfrif ar-lein.