The specified descriptions for the domestic regime are:
•	The promoter or participant wishes to keep the transaction confidential from Revenue or other promoters,
•	A premium fee attributable to or contingent on the tax advantage might be expected in respect of the transaction,
•	Use of a standardised tax product,
•	A loss scheme for individuals or companies,
•	An employment income scheme,
•	An “income into capital” scheme,
•	The conversion of income into a gift, or
•	A party to the transaction is the trustee of a discretionary trust.
The other conditions which apply to disclosable transactions under the domestic regime are that they enable or might enable a tax advantage, and that obtaining the tax advantage is the main benefit or one of the main benefits that might be expected from the transaction.

For the cross-border regime, a cross-border arrangement is one which involves participants who are not all tax resident in the same jurisdiction, are tax resident in multiple jurisdictions, have a permanent establishment in another jurisdiction, or otherwise operate in another jurisdiction with creating a permanent establishment or being tax resident. A cross-border arrangement also includes arrangements that impact in automatic exchange of information (this includes CRS reporting) and identification of beneficial ownership.
The hallmarks are set out in detail in Annex IV of the Directive. Certain hallmarks also require a main benefit test to be satisfied – that it can be reasonably expected that a tax advantage was the main benefit or one of the main benefits of the transaction.  The hallmarks can be broadly categorised as follows:
•	Generic hallmarks linked to the main benefit test; 
•	Specific hallmarks linked to the main benefit test; 
•	Specific hallmarks related to cross-border transactions (some of which are linked to the main benefit test); 
•	Specific hallmarks concerning automatic exchange of information and beneficial ownership (including CRS avoidance); and 
•	Specific hallmarks concerning transfer pricing.