Guidelines for expressing ”0g” for insignificant amounts of fat, saturates, protein, and salt are included in the EU guidance texts on nutritional labeling, including EU 1169/2011 (see section 6, table 4).
Although you are accountable for disclosing values that surpass these caps, a number of organizations and legal professionals have declared that ordinary wines don’t need any further testing.
The EU has standardized the acceptable tolerances. Therefore, a tolerance of 2 g/100 ml (equivalent to 20 g/l) is allowed for sugar/carbohydrate statements for wines with a sugar concentration of less than 100 g/l (typically all wines except sweet wines).
The permissible tolerances are standardized throughout the EU. As a result, for wines having a sugar content of less than 100 g/l (usually all wines except sweet wines), a tolerance of 2 g/100 ml (equal to 20 g/l) is permitted for sugar/carbohydrate declarations.