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it depends....
I agree with Ian that interest will be charged automatically. Deductibility depends on whether your client is an individual (self-employed) or a company.
If your client is an individual, interest charged for late payment is not deductible. However if your client is a limited company, it is deductible. Conversly, a repayment supplement (interest) paid to a limited company is taxable.
http://www.hmrc.gov.uk/manuals/ctmanual/CT10000/46_0019_CT10219.htm
Freddy
Yes
Interest will be due automatically under self assessment if any tax due is paid late. It will not be tax deductable (the same as if they were paying you interest it would not be taxable.