--- title: "W System (@wsystem) | Hashnode" description: "EU VAT, company, tenders & sanctions APIs for developers and AI agents. Read the latest articles by W System on Hashnode." url: "https://hashnode.com/@wsystem" --- @wsystem # W System @wsystem · Joined October 2026 EU VAT, company, tenders & sanctions APIs for developers and AI agents ### [Spain B2B e-invoicing from 6 October 2027: what invoicing software must ship](https://wsystem.hashnode.dev/spain-b2b-e-invoicing-2027-software?utm_source=hashnode&utm_medium=feed) Spain's B2B e-invoicing dates are fixed: 6 Oct 2027 above EUR 8m, 2028 for all. Formats, UBL copy to AEAT, checklist. 4 min read · [wsystem.hashnode.dev](https://wsystem.hashnode.dev/spain-b2b-e-invoicing-2027-software?utm_source=hashnode&utm_medium=feed) [Oct 22](https://hashnode.com/posts/spain-b2b-e-invoicing-2027-software/6ad9ec0905e1d03912e00d36) ### [Norway e-invoicing from 1 January 2027: what invoicing software must ship](https://wsystem.hashnode.dev/norway-e-invoicing-2027-software?utm_source=hashnode&utm_medium=feed) Norway's B2B e-invoice duty from 2027 for software builders: EHF / Peppol BIS 3.0, exemptions, 0192 addressing, checklist. 3 min read · [wsystem.hashnode.dev](https://wsystem.hashnode.dev/norway-e-invoicing-2027-software?utm_source=hashnode&utm_medium=feed) [Oct 22](https://hashnode.com/posts/norway-e-invoicing-2027-software/6ad9ebff9b94fb66ea0bcb13) ### [Poland KSeF from 1 January 2027: what invoicing software must change (fines now planned for 2028)](https://wsystem.hashnode.dev/poland-ksef-2027-invoicing-software?utm_source=hashnode&utm_medium=feed) KSeF is mandatory for every Polish business from 1 Jan 2027; fines move to 2028 (bill adopted 20 Oct). Checklist for software. 4 min read · [wsystem.hashnode.dev](https://wsystem.hashnode.dev/poland-ksef-2027-invoicing-software?utm_source=hashnode&utm_medium=feed) [Oct 22](https://hashnode.com/posts/poland-ksef-2027-invoicing-software/6ad9d14151c8ecf630c76cf6) ### [France e-invoicing: what invoicing software must fix before SMEs start issuing on 1 September 2027](https://wsystem.hashnode.dev/france-e-invoicing-2027-sme-software?utm_source=hashnode&utm_medium=feed) France's reform is live: 75% chose a platform, 20M+ invoices in a month. SMEs issue from 1 Sep 2027. Mentions, rejections, checklist. 5 min read · [wsystem.hashnode.dev](https://wsystem.hashnode.dev/france-e-invoicing-2027-sme-software?utm_source=hashnode&utm_medium=feed) [Oct 20](https://hashnode.com/posts/france-e-invoicing-2027-sme-software/6ad6e7906a06d9c8b0c2d93f) ### [Greece e-invoicing from 2 November 2026: what invoicing software needs to ship](https://wsystem.hashnode.dev/greece-e-invoicing-2-november-2026?utm_source=hashnode&utm_medium=feed) Greek B2B e-invoicing wave 2 starts 2 Nov 2026; ERP only in parallel until 31 Jan 2027. Timeline, provider vs ERP, MARK/QR, checklist. 3 min read · [wsystem.hashnode.dev](https://wsystem.hashnode.dev/greece-e-invoicing-2-november-2026?utm_source=hashnode&utm_medium=feed) [Oct 19](https://hashnode.com/posts/greece-e-invoicing-2-november-2026/6ad63e39444d0e78b0d786a0)