Spain started the clock on its B2B e-invoicing mandate
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On 5 October 2026 Spain published Order HAC/1028/2026 in the official gazette, and it took effect the next day. That started the clock in Royal Decree 238/2026: businesses above €8 million of turnover must issue and receive electronic invoices from 6 October 2027, everyone else from 6 October 2028.
Price Double Check sets a supplier's invoice against the price list that supplier sent and answers by email with the lines that differ, which is the part no mandate performs. For a buyer established outside Spain the two dates change nothing directly. What they change is the system a Spanish supplier invoices from, and a change of system is when item codes move.
What the order actually does
The royal decree of last March created the obligation and withheld its date. It said the periods would be counted from the entry into force of a ministerial order regulating the public invoicing platform: twelve months for businesses and professionals whose volume of operations exceeded €8 million in the preceding calendar year, twenty-four months for everybody else. For six months that order was a draft, and every published calendar was a guess.
The order is now law, dated 2 October, gazetted on 5 October and in force from 6 October. The arithmetic follows from that single date, which is why the deadlines land on the sixth of the month rather than the first.
| Date | What it brings |
|---|---|
| 6 October 2026 | The order enters into force and the twelve and twenty-four month periods begin |
| 6 August 2027 | The public invoicing platform has to be available, two months before the first deadline |
| 6 October 2027 | Businesses and professionals with a volume of operations above €8 million in the preceding year issue and receive electronic invoices |
| 6 October 2028 | All remaining businesses and professionals follow |
Two technical points in the order matter to anyone who will receive these documents. Four syntaxes are accepted — UBL, CII, EDIFACT and the Spanish Facturae — and all four express the same semantic model, the European standard EN 16931. So there are four shapes of file and one meaning, and the field that carries a unit price is the same field in each of them.
What it changes for a buyer, and what it does not
- Nothing on the invoices arriving this month. The obligation runs between businesses and professionals established in Spain. A buyer in Tallinn or Dublin sits outside it and keeps receiving an ordinary attachment by email, which is the direction of travel described in the PDF giving way to a structured document.
- A year of supplier system changes, starting well before October 2027. Nobody migrates an invoicing system on the deadline. The migrations are the risk, not the mandate: a new system renumbers, merges and re-describes goods, and the buyer sees that as a familiar product under an unfamiliar code.
- A reason to ask for the item code now. In the validation set behind this service, 335 of 442 invoice lines carried a description that differed from the price-list row for the same goods, so the code is the only key worth joining on. One substitution in that set, a 550cc pack at €2.07 replaced by an 800ml pack at €2.59, cost €15.60 and no arithmetic could have found it.
- No help at all with the price. A document can be valid UBL, signed, routed and accepted, and still carry a unit price higher than the list the buyer was sent. The mandate governs how an invoice is shaped and how it travels. It is silent on whether the number on the line is the number that was promised.
The last one is the whole of the buyer's position in every mandate that has come in this year. Structure makes the comparison cheaper to perform, because a price in a field beats a price in a table in a PDF. It does not perform the comparison, and it does not hold the price list that the comparison needs on the other side.
Kurz gesagt
- Whether a non-Spanish buyer has to do anything by October 2027
- No. The obligation falls on businesses and professionals established in Spain, in their dealings with each other. A buyer elsewhere in the Union is a recipient of an ordinary invoice and the order asks nothing of them.
- What to ask a Spanish supplier before their deadline
- Two things. Which of the four accepted syntaxes they intend to send, in case they offer to send it to you as well, and whether their item codes survive the migration unchanged. The second question is worth more than the first.
- Why the deadlines fall on the sixth of October
- Because the royal decree counts twelve and twenty-four months from the day the ministerial order enters into force, and that day was 6 October 2026. Earlier calendars showing 1 October 2027 were built on the draft of the order, which proposed a different start.
Forward one invoice and the price list it should have been billed on from any supplier, in whatever format each of them arrives in, and the comparison comes back by email with the differing lines named. What it costs is on the home page, and receiving structured documents without an accounting system to put them in is covered in receiving Peppol invoices without an ERP.