By virtue of a legislative decree, it has become mandatory to enter your tax code for all orders executed on BARRIERPLANET.COM with invoicing in Italy. If you want to know more, we invite you to read the Decree of the President of the Republic dated 10/26/1972 n. 633. In particular, the section dedicated to Art. 21, 2nd paragraph, letter e) and f) relating to the mandatory nature of the tax code for invoicing purposes.