What information has to be included in a tax invoice?

1. An identifying number of the invoice    
2. Date of supply        
3. Name, address and V.A.T. registration number of supplier    
4. Name, address and V.A.T. registration number of customer    
5. Details of the supply made    
6. The total price before any discount    
7. The rate of discount if any    
8. For each supply made, the rate of tax chargeable thereon and the price charged excluding V.A.T.
9. The tax chargeable at each rate    
10. Total V.A.T. chargeable

A fiscal cash register receipt can be valid as a tax invoice if it includes the VAT Registration number of the customer.