Spain is quickly and steadily marching towards the planned July 1 implementation of the new Supply of Information System (locally known as SII) reporting requirement. Under the law, businesses have four days from the time an invoice is issued or received to notify the Spanish Tax Administration (AEAT) of the transaction. Determining the exact day of the deadline can be confusing when considering the impact of weekend and other Spanish holidays. Likewise, during the first six months of the requirement, the law affords taxpayers 8 days to comply. So as to avoid any possible confusion, AEAT has designed an online tool that automatically calculates the filing deadline by inputting the type of invoice and the date of issuance or receipt. The tool can be found here.