Registering a car can seem like a simple procedure until something goes wrong. A missing document, incorrect information on the form, a tax that has not been paid on time. Any of these mistakes can bring the process to a halt for days or weeks, with the vehicle immobilised and the customer waiting.
For dealerships, these delays have a direct cost: the car remains in stock without being in the buyer’s name, delivery is delayed and the buying experience deteriorates at the most visible moment. This article reviews the most common mistakes when registering a car, what causes them and what to do to avoid them.
Incomplete or incorrect documentation
The first group of errors has to do with the paperwork. The DGT requires all documents for registering a car to be in order before processing any registration or change of ownership request. A single incorrect field or a document that does not match another can create an issue that forces you to start the procedure from scratch.
The most problematic documents are usually:
The registration certificate, especially for imported cars where the chassis number may not match exactly the Spanish technical sheet.
The reduced technical sheet, mandatory for vehicles from another EU country. If the homologation has not been handled correctly, the registration plate cannot be assigned.
The buyer’s ID card or tax identification number, which must match exactly the details on the sales contract. A misspelled name or an incorrect identification number will halt the file.
The most practical advice here is to check all the documents before submitting them, not when the problem has already been detected. If you work with an agency, make sure they receive the full documentation from the first submission.
Not paying the ITP or registration tax before submitting the application
One of the most frequent mistakes, especially among private buyers, but one that also affects dealerships when they handle the registration on behalf of the customer, is trying to process the change of ownership without first paying the relevant taxes.
For second-hand vehicles, the Transfer Tax (ITP) must be paid before submitting the application to the DGT. For new or imported vehicles, the Special Tax on Certain Means of Transport applies, better known as the registration tax. Submitting the application without proof of payment creates an automatic issue.
The deadline for paying the ITP is 30 working days from the date of sale. Once that deadline has passed, the taxpayer falls into arrears and the process becomes more complicated, with surcharges that can reach 20% of the amount due. If you have questions about how the ITP is calculated, in the article what the ITP is when buying cars we explain it in detail.
Errors in the chassis number or vehicle details
The VIN (chassis number) is the vehicle’s unique identifier. Just one character transcribed incorrectly means the DGT systems cannot find the vehicle and the procedure is blocked. This mistake is especially common when working with imported cars, where chassis numbers may have different formats depending on the country of origin.
The same applies to other vehicle details such as fiscal power, CO₂ emissions or body type. These details determine, among other things, the base for the registration tax. If there is a discrepancy between what has been declared and what appears on the technical sheet, the DGT may request additional documentation or reject the application outright.
The way to avoid this is simple: always copy the details directly from the original documents, never from memory or from another system where previous errors may have been introduced.
Trying to register a car with outstanding encumbrances
A car cannot be transferred or registered if it has administrative or legal encumbrances attached. The most common problems in this area are:
Active liens: if the vehicle has a lien in the name of the previous owner, the DGT blocks any procedure until it is lifted. In the article on how to remove a lien from a car we explain the process in detail.
Retention of title: if the car was financed and the finance company has an active retention of title, the transfer cannot be carried out without the consent or cancellation of that encumbrance. You can read about how retention of title works on cars to fully understand this situation.
Expired or failed MOT: the DGT does not register vehicles that have not passed the relevant MOT test.
Before formalising any purchase, checking the vehicle’s history with the DGT and, where the operation justifies it, a CARFAX report, avoids surprises at the time of the procedure. At Dealcar, the DGT and CARFAX report check is integrated into the vehicle file, allowing these issues to be detected before the deal is closed.
Issues with deadlines: who should process it and within what time
Another common mistake is not being clear about who is responsible for handling the registration and within what timeframe. For used vehicles sold between private individuals, the buyer is responsible for processing the change of ownership within 30 working days. In the case of professional dealerships, that deadline also applies from the date of sale.
When a dealership acts as an intermediary and delays the transfer, it may incur traffic penalties because the vehicle remains linked to the previous owner. If, during that period, the car receives a fine or causes an accident, liability may fall on whoever is listed as the owner in the DGT, not on the person driving it.
The solution is to have a clear document management process for each transaction: which documents are needed, who collects them, who delivers them to the agency and by when. The more standardised that workflow is, the less room there is for mistakes.
How to manage sales files to avoid these mistakes
Most of the mistakes described share a common denominator: a lack of organisation in document management. When vehicle details are in an Excel spreadsheet, the buyer’s documents are in email, the contract is in a Drive folder and the proof of ITP payment is with the agency, it is easy for something to get lost or for a detail not to match up.
At Dealcar, the sales file centralises all the documentation for each transaction in one place: vehicle details, buyer documents, contract, invoices and the status of each procedure. The aim is for anyone on the team to be able to see at a glance what is still missing before the car can be delivered. This reduces document errors and shortens the time between the sale and the actual delivery.
Conclusion
Mistakes when registering a car are rarely irreversible, but they always cost time and, in many cases, money. Incomplete paperwork, unpaid taxes, undetected encumbrances or missed deadlines are the four major sources of problems. Detecting them before starting the procedure, not afterwards, makes the difference between a smooth delivery and an unnecessarily complicated transaction.
Frequently asked questions
What happens if I make a mistake when entering the chassis number in the registration procedure?
The DGT will not be able to locate the vehicle in its system and the application will be blocked. The data must be corrected and the documentation resubmitted. If the error is in the original technical sheet, the process may require additional steps with the manufacturer or importer to obtain an official correction.
Can I register a car without having paid the ITP?
No. Payment of the ITP is a prerequisite for any change-of-ownership procedure at the DGT. Without proof of payment, the application will not proceed. The deadline for paying it is 30 working days from signing the sales contract.
Who is responsible for fines if the car is still in the seller’s name?
Legally, the registered owner in the DGT is the primary person responsible for traffic penalties. If the buyer or dealership takes too long to process the change of ownership, any fine or incident that occurs during that period can be attributed to the previous owner, even if they have sold the car.
How can I tell if a car has liens before buying it?
You can request it directly from the DGT through a vehicle report, or use services such as CARFAX which include legal issues, accident history and mileage consistency. It is an investment that helps avoid purchases that cannot later be transferred.
How long does the DGT take to process a registration? If all the documentation is correct and the taxes have been paid, the procedure is usually resolved in a few working days online. If there are issues, the process can take weeks until they are corrected. We explain it in more detail in the article "How long does it take to register a car in Spain?".
More than 500 dealerships already use Dealcar
More and more dealerships are using Dealcar to manage the entire sales process in an orderly way: stock, files, contracts, invoicing and DGT procedures from a single system. If you run a dealership and want to reduce administrative errors in each transaction, you can book a free demo at dealcar.io.
Registering a car can seem like a simple procedure until something goes wrong. A missing document, incorrect information on the form, a tax that has not been paid on time. Any of these mistakes can bring the process to a halt for days or weeks, with the vehicle immobilised and the customer waiting.
For dealerships, these delays have a direct cost: the car remains in stock without being in the buyer’s name, delivery is delayed and the buying experience deteriorates at the most visible moment. This article reviews the most common mistakes when registering a car, what causes them and what to do to avoid them.
Incomplete or incorrect documentation
The first group of errors has to do with the paperwork. The DGT requires all documents for registering a car to be in order before processing any registration or change of ownership request. A single incorrect field or a document that does not match another can create an issue that forces you to start the procedure from scratch.
The most problematic documents are usually:
The registration certificate, especially for imported cars where the chassis number may not match exactly the Spanish technical sheet.
The reduced technical sheet, mandatory for vehicles from another EU country. If the homologation has not been handled correctly, the registration plate cannot be assigned.
The buyer’s ID card or tax identification number, which must match exactly the details on the sales contract. A misspelled name or an incorrect identification number will halt the file.
The most practical advice here is to check all the documents before submitting them, not when the problem has already been detected. If you work with an agency, make sure they receive the full documentation from the first submission.
Not paying the ITP or registration tax before submitting the application
One of the most frequent mistakes, especially among private buyers, but one that also affects dealerships when they handle the registration on behalf of the customer, is trying to process the change of ownership without first paying the relevant taxes.
For second-hand vehicles, the Transfer Tax (ITP) must be paid before submitting the application to the DGT. For new or imported vehicles, the Special Tax on Certain Means of Transport applies, better known as the registration tax. Submitting the application without proof of payment creates an automatic issue.
The deadline for paying the ITP is 30 working days from the date of sale. Once that deadline has passed, the taxpayer falls into arrears and the process becomes more complicated, with surcharges that can reach 20% of the amount due. If you have questions about how the ITP is calculated, in the article what the ITP is when buying cars we explain it in detail.
Errors in the chassis number or vehicle details
The VIN (chassis number) is the vehicle’s unique identifier. Just one character transcribed incorrectly means the DGT systems cannot find the vehicle and the procedure is blocked. This mistake is especially common when working with imported cars, where chassis numbers may have different formats depending on the country of origin.
The same applies to other vehicle details such as fiscal power, CO₂ emissions or body type. These details determine, among other things, the base for the registration tax. If there is a discrepancy between what has been declared and what appears on the technical sheet, the DGT may request additional documentation or reject the application outright.
The way to avoid this is simple: always copy the details directly from the original documents, never from memory or from another system where previous errors may have been introduced.
Trying to register a car with outstanding encumbrances
A car cannot be transferred or registered if it has administrative or legal encumbrances attached. The most common problems in this area are:
Active liens: if the vehicle has a lien in the name of the previous owner, the DGT blocks any procedure until it is lifted. In the article on how to remove a lien from a car we explain the process in detail.
Retention of title: if the car was financed and the finance company has an active retention of title, the transfer cannot be carried out without the consent or cancellation of that encumbrance. You can read about how retention of title works on cars to fully understand this situation.
Expired or failed MOT: the DGT does not register vehicles that have not passed the relevant MOT test.
Before formalising any purchase, checking the vehicle’s history with the DGT and, where the operation justifies it, a CARFAX report, avoids surprises at the time of the procedure. At Dealcar, the DGT and CARFAX report check is integrated into the vehicle file, allowing these issues to be detected before the deal is closed.
Issues with deadlines: who should process it and within what time
Another common mistake is not being clear about who is responsible for handling the registration and within what timeframe. For used vehicles sold between private individuals, the buyer is responsible for processing the change of ownership within 30 working days. In the case of professional dealerships, that deadline also applies from the date of sale.
When a dealership acts as an intermediary and delays the transfer, it may incur traffic penalties because the vehicle remains linked to the previous owner. If, during that period, the car receives a fine or causes an accident, liability may fall on whoever is listed as the owner in the DGT, not on the person driving it.
The solution is to have a clear document management process for each transaction: which documents are needed, who collects them, who delivers them to the agency and by when. The more standardised that workflow is, the less room there is for mistakes.
How to manage sales files to avoid these mistakes
Most of the mistakes described share a common denominator: a lack of organisation in document management. When vehicle details are in an Excel spreadsheet, the buyer’s documents are in email, the contract is in a Drive folder and the proof of ITP payment is with the agency, it is easy for something to get lost or for a detail not to match up.
At Dealcar, the sales file centralises all the documentation for each transaction in one place: vehicle details, buyer documents, contract, invoices and the status of each procedure. The aim is for anyone on the team to be able to see at a glance what is still missing before the car can be delivered. This reduces document errors and shortens the time between the sale and the actual delivery.
Conclusion
Mistakes when registering a car are rarely irreversible, but they always cost time and, in many cases, money. Incomplete paperwork, unpaid taxes, undetected encumbrances or missed deadlines are the four major sources of problems. Detecting them before starting the procedure, not afterwards, makes the difference between a smooth delivery and an unnecessarily complicated transaction.
Frequently asked questions
What happens if I make a mistake when entering the chassis number in the registration procedure?
The DGT will not be able to locate the vehicle in its system and the application will be blocked. The data must be corrected and the documentation resubmitted. If the error is in the original technical sheet, the process may require additional steps with the manufacturer or importer to obtain an official correction.
Can I register a car without having paid the ITP?
No. Payment of the ITP is a prerequisite for any change-of-ownership procedure at the DGT. Without proof of payment, the application will not proceed. The deadline for paying it is 30 working days from signing the sales contract.
Who is responsible for fines if the car is still in the seller’s name?
Legally, the registered owner in the DGT is the primary person responsible for traffic penalties. If the buyer or dealership takes too long to process the change of ownership, any fine or incident that occurs during that period can be attributed to the previous owner, even if they have sold the car.
How can I tell if a car has liens before buying it?
You can request it directly from the DGT through a vehicle report, or use services such as CARFAX which include legal issues, accident history and mileage consistency. It is an investment that helps avoid purchases that cannot later be transferred.
How long does the DGT take to process a registration? If all the documentation is correct and the taxes have been paid, the procedure is usually resolved in a few working days online. If there are issues, the process can take weeks until they are corrected. We explain it in more detail in the article "How long does it take to register a car in Spain?".
More than 500 dealerships already use Dealcar
More and more dealerships are using Dealcar to manage the entire sales process in an orderly way: stock, files, contracts, invoicing and DGT procedures from a single system. If you run a dealership and want to reduce administrative errors in each transaction, you can book a free demo at dealcar.io.
