At present, those who are caught out could face a bill for up to 20 years of unpaidtax and interest, plus penalties that can be up to 100% of the amount owed.
Times, Sunday Times (2007)
Ministers say that the measure will help the government to rake in 100 million of unpaidtax.
Times, Sunday Times (2014)
The unpaidtax itself must also be repaid.
Times, Sunday Times (2009)
Seetax law
Definition of 'unpaid'
unpaid
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adjective
Unpaid taxes or bills, for example, are bills or taxes which have not been paid yet.