The tax due on that transaction is now £24,487.18, however, as £18,235.29 (£13,500 + £4,735.29) has already been paid only £6,251.89 needs to be paid.
Ond, gan fod £18,235.29 (£13,500 + £4,735.29) wedi’i dalu’n barod, dim ond £6,251.89 sydd i’w dalu.