This technical specification outlines the procedures for integrating with the Croatian Tax Administration’s Fiscalization Information System (CIS). It defines how businesses must electronically submit invoices, self-service transactions, and tips (gratuities) in real time using XML messages over secure web services. Read more

S4F backoffice patch is intended for users who have already installed S4F backoffice and are intended to update existing installations to latest version. To do so apply only patches that are marked with version number that is newer than your currently installed instance of backoffice. Read more

Croatia has released a draft of the new Fiscalization Act for public consultation, proposing major changes for both B2C and B2B transactions. All invoices issued to consumers must now be fiscalized, regardless of payment method—including online payments via Stripe, PayPal, or bank transfers. Read more

A new EU Trust List format, TLv6, will officially replace TLv5 in May 2025 as part of the updated eIDAS Regulation (EU 2024/1183). It introduces key technical changes like a new URI field, updated signature format, and optional phone number support. Organizations must update their systems to avoid signature validation failures and service disruptions, as TLv5 will no longer be valid once TLv6 take... Read more

Croatia's new fiscalization law mandates electronic invoicing for all B2B, B2G, and B2C transactions, starting with VAT payers on January 1, 2026, and extending to non-VAT businesses on January 1, 2027, with a free invoicing application provided. Businesses must register their chosen e-invoice distribution and fiscalization methods between September 1 and December 31 of this year, and specific invoice payments up to 700 EUR must be reported to the Tax Administration via fiscalization messages. Read more

The EU adopted the VAT in the Digital Age (ViDA) package on March 11, 2025, introducing major changes to the VAT system starting January 1, 2027. Key reforms include mandatory digital VAT reporting by 2030, new VAT collection rules for online platforms, and expanded One-Stop Shop (OSS) registration to simplify cross-border compliance. Additional measures, such as mandatory e-invoicing, phasing out... Read more

S4F backoffice patch is intended for users who have already installed S4F backoffice and are intended to update existing installations to latest version. To do so apply only patches that are marked with version number that is newer than your currently installed instance of backoffice. Read more