As of October 2026, a one-page burofax (Correos' urgent delivery against signature, which can also certify the content) costs €8.71 sent online and €12.72 from a post office (mainland Spain and the Balearics, VAT included). Each extra page is €1.27. To prove what it said you need the certified copy (€17.55 if you order it when sending) and, for signed proof of delivery, the acknowledgement of receipt (€5.75). A complete burofax comes to about €32 to €36.
How much does each type of burofax cost?
These are the prices in the 2026 Correos price list for mainland Spain and the Balearics, VAT included, as of October 2026:
| Option | First page | Each extra page | What it includes |
|---|---|---|---|
| Burofax Premium Online (from Mi Oficina, Correos' online account) | €8.71 | €1.27 | Urgent delivery against signature |
| Burofax Premium (at a post office) | €12.72 | €1.27 | The same, bought at the counter |
| Burofax Premium Plus | €36.01 | €1.27 | Adds a certified copy, electronic proof of delivery and 60 months' storage |
The Canary Islands use IGIC instead of VAT, and the Canary Islands price list is different: €7.70 online, €11.25 at a post office and €31.84 for Premium Plus.
According to the Burofax Premium page, "la entrega queda registrada bajo firma del destinatario y sirve como prueba con validez legal frente a terceros" (delivery is recorded under the recipient's signature and serves as legally valid proof against third parties). It can go to the recipient's address, to a post office or to a PO box.
Which extras do you pay for separately?
The base price only covers sending and delivery. What really protects you if there is a dispute is bought separately:
| Extra | Price (VAT incl.) | What you get |
|---|---|---|
| Certified copy ordered when sending (copia certificada) | €17.55 up to 3 pages, plus €0.38 per page | An authenticated copy of the text you sent |
| Certified copy ordered later | €33.88 up to 3 pages, plus €0.51 per page | The same, at almost double the price |
| Acknowledgement of receipt (acuse de recibo) | €5.75 | Written proof of who received it and the date and time |
| Electronic proof of delivery (prueba de entrega electrónica) | €5.75 | A PDF signed with a time stamp and the recipient's signature, verifiable with a CSV code |
| Certifications (posting, delivery or attempted delivery) | €17.55 each | A Correos certificate of that specific fact |
| Burofax storage for 10 years | €2.24 | Correos keeps the item for 120 months instead of 60 |
The price gap on the certified copy is where you save most. If you think you may need to prove what the burofax said, order the copy when you send it. Correos keeps the item and lets you request certification of the content "hasta cinco años después de la admisión del envío" (up to five years after the item was accepted), or up to ten with extended storage. But ordering it later costs €33.88 instead of €17.55.
How much does a complete burofax cost?
Adding up the items in the general price list, these are the most common cases. You see the exact total in Mi Oficina or at the counter before paying.
| Case | Calculation | Total |
|---|---|---|
| Online, 1 page, no extras | 8.71 | €8.71 |
| Online, 1 page, with acknowledgement of receipt | 8.71 + 5.75 | €14.46 |
| Online, 1 page, with certified copy and acknowledgement | 8.71 + 17.55 + 5.75 | €32.01 |
| Post office, 1 page, with certified copy and acknowledgement | 12.72 + 17.55 + 5.75 | €36.02 |
| Post office, 3 pages, with certified copy and acknowledgement | 12.72 + 2.54 + 17.55 + 5.75 | €38.56 |
Premium Plus (€36.01) bundles the certified copy and the electronic proof of delivery into one price. Bought separately at a post office it would cost almost exactly the same: 12.72 + 17.55 + 5.75 = €36.02. It does not include the acknowledgement of receipt; proof of delivery comes in the electronic proof PDF instead.
For comparison: a standard national registered letter (carta certificada) of up to 20 grams costs €5.74 and its acknowledgement of receipt €2.90. That is €8.64 in total.
What does each option prove?
This is the real difference between paying €8 and €36:
- Burofax with no extras. It proves urgent sending and delivery against signature. Correos keeps the content, so you can request certification later, at a higher price.
- With a certified copy. It also proves what the document said. Correos says the copy has "validez legal frente a terceros" (legal validity against third parties).
- With acknowledgement of receipt or electronic proof of delivery. You get a document showing who received it and when.
- Registered letter with acknowledgement of receipt. It proves delivery and the date but, as Correos itself admits in its comparison of registered letter and burofax, it "no certifica el contenido de la carta" (does not certify the content of the letter). If the other side says the envelope was empty, you cannot prove otherwise.
Courts treat the burofax as the reference standard. The Supreme Court (Tribunal Supremo), in judgment 493/2022 of 22 June, said that "el burofax remitido es un instrumento idóneo" (the burofax sent is a suitable instrument) because it "acredita el contenido literal de la comunicación enviada, así como la identidad del remitente, del destinatario, del lugar o domicilio al que se dirige, así como el resultado de la entrega" (proves the literal content of the communication, the identity of the sender and the recipient, the place or address it was sent to, and the result of delivery). The Murcia Provincial Court cites it in its order 72/2026, among others.
That said, a burofax is only worth what Correos certifies. In its judgment 296/2026, the Alicante Provincial Court did not accept an uncollected burofax. Correos certified that it was not collected from the post office, but not that a notice had been left; photographs showed the property had no letterbox, and the burofax did not include the invoices being claimed. The court did not deny "en abstracto la validez del burofax como medio fehaciente" (in the abstract, the validity of the burofax as a reliable means of proof), but that particular one was not enough.
How long does it take, and what if the recipient is out?
According to Correos, a burofax is delivered the same day if it is accepted before 13:00 and goes to a town with special delivery, and on the morning of the next working day in all other cases. Saturdays, Sundays and public holidays do not count, and same-day delivery is not guaranteed in July, August and September. If a delay is Correos' fault, they refund the burofax price, without the extras.
If nobody is in, Correos makes "dos intentos de entrega bajo firma" (two delivery attempts against signature) and then leaves an arrival notice so it can be collected from the post office "en un plazo máximo de 30 días" (within 30 days at most), as it explains in its online burofax guide. If the recipient refuses it or does not collect it, the burofax does not necessarily lose its value: we explain this in burofax refused or not collected.
Should you send it online or from a post office?
Online is €4.01 cheaper and there is no queue. You register for free in Mi Oficina, upload the document as a PDF (with valid or embedded fonts), add the recipients and the extras, and pay by card, PayPal or against a Correos contract. You can load several recipients from a file, which helps if you send the same document to many people.
A post office makes sense if you do not have the document in digital form, or you would rather have someone check the item with you.
When can a certified email help?
A certified email is not a burofax and does not replace one. It is worth being clear about that from the start.
The EU eIDAS Regulation distinguishes two kinds of electronic registered delivery service:
- Qualified. Provided by providers on the official EU trusted list. Only these carry the legal presumption in article 43.2 of eIDAS: integrity of the data, sending by the identified sender, receipt by the identified recipient and accuracy of the date and time.
- Non-qualified. Article 43.1 guarantees they will not be denied value as evidence "por el mero hecho de que estén en formato electrónico o no cumplan los requisitos de servicio cualificado de entrega electrónica certificada" (solely because they are electronic or do not meet the requirements of a qualified service). If the other side challenges them, whoever submitted them can ask for an expert comparison or other evidence, and if authenticity remains unclear the judge weighs them by the rules of sound judgement (article 326 of the Civil Procedure Act, Ley de Enjuiciamiento Civil).
A non-qualified certified email is not fehaciente (legally reliable proof of notice) in the legal sense: it is electronic evidence, which can be very good or very poor depending on what it records. It can be useful in these cases:
- The recipient uses that email with you. You agreed it in writing, or it is your usual channel. This counts most if it is disputed later.
- To prove an attempt to negotiate before going to court (MASC). Organic Law 1/2025 asks in article 10.2 for a document proving that the other side received the proposal, on what date and that they could access its full content, without requiring a specific channel. We cover this in MASC by certified email.
- As a second channel alongside the burofax. It does not depend on anyone going to the post office, and it can record that the document was opened and downloaded.
- For everyday communications where a normal email is too weak as evidence and a burofax is overkill.
When should you send a burofax anyway?
| Situation | What to send |
|---|---|
| The law asks for a fehaciente (reliable) means | Burofax with certified copy and acknowledgement |
| The law names the means (for example, a notary's demand) | Whatever the law says, even if it costs more |
| The recipient has never used email with you | Burofax to their address |
| You expect them to dispute everything | Burofax, and email as well if you like |
| There is an agreed email address and it is a routine communication | Certified email may be enough as evidence |
Some examples for the first row: the demand for payment to a tenant that stops them halting an eviction by paying late must be made "por cualquier medio fehaciente" (by any reliable means) at least thirty days in advance (art. 22.4 of the Civil Procedure Act). Telling a tenant you are going to sell the home must be done "en forma fehaciente" under the Urban Leases Act (Ley de Arrendamientos Urbanos, art. 25). And for the second row: in the sale of property with deferred payment, the Civil Code (Código Civil) speaks of a demand to the buyer made "judicialmente o por acta notarial" (through the courts or by notarial deed, art. 1504).
Be careful with an agreed email address in a rental too. The Urban Leases Act lets the parties name an email address for notices, "siempre que se garantice la autenticidad de la comunicación y de su contenido y quede constancia fehaciente de la remisión y recepción íntegras y del momento en que se hicieron" (provided the authenticity of the communication and its content is guaranteed, and there is reliable proof of the full sending and receipt and of when they happened, art. 4.6). A qualified service carries a legal presumption of those facts; a non-qualified one will have to prove them if the tenant disputes it.
We build a certified email service of the non-qualified kind. It sends the document from your own domain and records, for each recipient, delivery, opening and download with date, time and IP address, with a SHA-256 fingerprint of the document that can be checked on a public page. Opening is indicative; the download is the strong evidence. It is not fehaciente and it does not replace a burofax: it works as supporting evidence, and as the usual channel when the recipient uses email.
Frequently asked questions
How much does a burofax with acknowledgement of receipt cost?
As of October 2026, €14.46 sent online (€8.71 plus €5.75 for the acknowledgement) and €18.47 from a post office (€12.72 plus €5.75), for one page. If you also want to prove the content, add €17.55 for the certified copy.
Is it cheaper to send a burofax online?
Yes. Burofax Premium Online costs €8.71 against €12.72 at a post office, €4.01 less. Each extra page costs the same, €1.27.
How many pages does the burofax price include?
Only the first. Each extra page costs €1.27. The certified copy covers up to three pages for €17.55, and each extra page adds €0.38.
Can I request certification of the content after sending it?
Yes. Correos lets you request it up to five years after sending, or longer if you paid for 10-year storage. But ordered later it costs €33.88 for up to three pages, almost double the price at the time of sending.
Does a certified email replace a burofax?
No. A non-qualified certified email is electronic evidence that a judge weighs if it is disputed, not a fehaciente notice. It can help when the recipient uses that email with you or as a second channel, but when the law asks for a reliable means, the prudent choice is the burofax.
Sources
- Correos 2026 price list, mainland Spain and the Balearics, pp. 5 (registered letter), 7 (burofax), 32 (acknowledgement of receipt, proof of delivery, storage) and 34 (certified copies and certifications).
- Correos 2026 price list, Canary Islands.
- Correos: Burofax Premium (extras, delivery times and guarantees).
- Correos: Online burofax, what it is, how it works and how to send it, 18 February 2026.
- Correos: Registered letter or burofax, how to choose, 9 June 2026.
- Correos: Registered letter.
- Regulation (EU) 910/2014 (eIDAS), art. 43, unchanged in the EUR-Lex consolidated version.
- Civil Procedure Act (Ley 1/2000, de Enjuiciamiento Civil), arts. 22.4 and 326.
- Urban Leases Act (Ley 29/1994, de Arrendamientos Urbanos), arts. 4.6 and 25.
- Organic Law 1/2025 (Ley Orgánica 1/2025), art. 10.2.
- Civil Code (Código Civil), art. 1504.
- Murcia Provincial Court, Section 4, order 72/2026, which cites Supreme Court judgments 493/2022 of 22 June and 633/2022 of 29 September.
- Alicante Provincial Court, Section 5, judgment 296/2026.
This article explains the law and published court criteria as of the update date. It is not a substitute for advice from a lawyer on a specific case.