STSM041010 | Exemptions and Reliefs: Exemptions: 'Exemption' or 'relief'
From HM Revenue & Customs · Stamp Taxes on Shares Manual
Broadly, an ‘exemption’ is where:
a particular type of security,
a class of person, or
a transaction type
is outside the scope of the charging provisions of stamp duty or Stamp Duty Reserve Tax (SDRT).
By contrast, a ‘relief’ is where a transaction is within the scope of the charges but other provisions exist whereby the stamp duty or SDRT liability is removed or ‘relieved’.