Errors in purchase and sale deeds continue to be common in 2026. They generate rectifications that cost between 450 and 1,200 euros and delay registry registration between 25 and 70 days. Buyers and sellers can avoid them if they review the documentation in time.
The Mortgage Law and regional regulations require that all data match. The notary attests to the act but does not correct previous errors. The registrar rejects defective titles. A clean deed avoids these problems and allows the buyer to take possession of the property immediately.
Incorrect description of the property
This error ranks first. The deed must reflect the exact address, the constructed surface area, the boundaries and the cadastral reference without discrepancies. It occurs when the seller provides old data or the buyer does not verify the simple note.
Differences in surface area are the most frequent case. An apartment of 92 square meters in the cadastre appears as 78 in the registry. The notary inserts the provided data. The registrar issues a negative note and requires rectification.
A couple from Valencia signed the purchase and sale of a penthouse in Russafa on March 12, 2026. The simple note recorded 105 square meters. The updated cadastre indicated 118 square meters after an unregistered renovation. The registrar returned the title. The rectification cost 820 euros and delayed the delivery of keys by 47 days. The seller had to pay the difference in municipal capital gains tax.
Avoid this error by requesting the simple note less than 15 days old and the descriptive and graphic cadastral certification. Compare the complete cadastral references. Review the boundaries one by one. If the difference exceeds 5%, execute a deed of description rectification before the purchase and sale.
In 2026 the Cadastre and Registry databases allow immediate cross consultation. Dedicate 10 days to this verification. Provide both documents to the notary. Literal matching avoids 80% of rejections.
Problems with the energy efficiency certificate
The energy certificate must be registered on the regional platform and be less than 10 years old. The A to G rating label is included in the deed. Many sellers provide unregistered copies or certificates for different properties.
The regulations updated in 2026, which modify Royal Decree 390/2021, require incorporating the certificate's QR code in the deed. Without this data the notary cannot authorize it. The buyer receives a digitally sealed copy.
Penalties range from 300 to 600 euros depending on the region. The average delay to obtain a new certificate is 18 days. In cities like Barcelona or Bilbao, technicians take longer in winter due to high demand.
Request the certificate from the seller when signing the earnest money agreement. Verify that the registration number matches the exact property. Check that the issuance date is after 2016. Include the document in the folder you deliver to the notary 7 days before signing.
If the property has a G rating, inform the buyer of future limitations. Some regions apply restrictions starting in 2027. This step avoids subsequent claims.
Incorrect tax settlement
Taxes amount to between 6% and 11% of the price depending on the autonomous community. The most common errors are miscalculating the taxable base, forgetting the municipal capital gains tax or submitting the forms past the deadline.
The deadline to settle the Property Transfer Tax is 30 business days from signing. In 2026 form 600 is submitted electronically in all communities. The receipt must reach the notary before sending the deed to the registry.
The municipal capital gains tax is calculated on the increase in land value. A typical error is using the old cadastral value. In Madrid the tax rate ranges between 4% and 5.5% depending on the municipality. In Seville it reaches 29% on the real increase in some cases.
A company in Bilbao sold a commercial premises for 320,000 euros in January 2026. It forgot to include the 21% VAT in the self-assessment because part of the price corresponded to machinery. The tax authorities required complementary payment plus a 20% surcharge. Registration was halted for 39 days.
Prepare the calculations 20 days in advance. Use the official calculators from each regional tax authority. Separate the value of the property from that of furniture or storage units if applicable. Deliver the completed forms to the notary along with proof of payment. Check if the buyer is entitled to reductions for age, disability or first home.
Lack of coordination with the Property Registry
The notary must send the deed electronically within a maximum of 10 days from signing according to the updated Law 11/2021. The registrar qualifies it in 15 business days. If even one document is missing, the title is returned.
The most problematic documents are the certificate of being current on IBI, the first occupancy license for new homes, the homeowners' association certificate and proof of tax payment.
In 2026 the SIR platform (Registry Interconnection System) allows real-time viewing of defects. Even so, lack of coordination generates 35% of negative notes.
Deliver to the notary the IBI receipt for the last paid period and the community certificate confirming that no fees are owed. If the property is newly built, include the new construction declaration and the habitability certificate. Ask the notary 5 days before signing if any additional document is needed.
Errors in the identification and capacity of the parties
DNI and NIE must be valid and match the registry data. When one of the signatories acts by power of attorney, it must contain express powers to sell or buy and must not have expired.
Powers are often granted without a time limit. In 2026 electronic powers are verified automatically through the General Council of Notaries platform. An incomplete power requires granting a new one before signing.
Check that the power includes the specific authority to dispose of the property being sold. If the buyer is financing the operation, the power must allow requesting a mortgage. Verify the identity of all signatories in advance. Foreigners need a valid NIE and, in some cases, a sworn translation of the passport.
Checklist to review before signing
Prepare this list and check each point. Deliver everything to the notary 10 days in advance.
- Simple note from the Property Registry dated less than 15 days ago.
- Updated descriptive and graphic cadastral certification.
- Registered energy efficiency certificate with QR code.
- Completed self-assessment forms for ITP, VAT or AJD.
- Proof of tax payment or exemption.
- Receipts for IBI, waste collection fees and paid community dues.
- Certificate from the homeowners association.
- Notarial power of attorney with sufficient powers and currently valid.
- Already signed private purchase and sale contract.
- Original identity documents of all signatories.
Review each document against the draft deed sent by the notary. Ask any questions before signing. An error-free deed registers on the first attempt.
These procedures can be completed electronically. The client prepares the documents from home and signs via videoconference with the notary.