Phase 1 is deliberately narrow — large corporates only. But Revenue states that ALL businesses must be able to RECEIVE e-invoices from suppliers from the outset, which is the obligation most Irish SMEs will miss. Tax rates, payment terms and liability calculations are unchanged; this is purely an invoicing and reporting reform.
The trap is describing Phase 1 as 'only large corporates' — every Irish VAT-registered business must be able to RECEIVE structured e-invoices from Nov 2028, which is the commercially significant point. Also, unlike the UK, Ireland IS bundling real-time reporting with e-invoicing from phase 1, so an Irish rollout is a bigger lift. Do not assert Peppol: Revenue's own pages have not committed to it.
3 of 4 are primary sources. Mandate dates move — treat this page as a starting point and confirm against the primary source before committing a plan.
Work hands-on with the EN 16931 formats behind this mandate — no login, nothing uploaded.
Scrub the Ireland timeline and watch an invoice become the document each deadline will require.
Open time machine →Open a UBL, Factur-X or XRechnung file and read every EN 16931 field.
Open viewer →Generate a well-formed sample invoice to test your mapping.
Open generator →Check whether your Ireland partner is reachable on Peppol.
Open lookup →A page is a starting point. A scoped analysis gives you the specification, the mapping and the effort — in weeks, not quarters.
