Irene Castaño, a pensioner in Santander, sold the flat she had lived in all her life in 2023 and bought a smaller one near her daughter. She applied the exemption for reinvestment in a main home. On 14 September 2026 she is notified of an assessment for 7,300 € of tax. The Agencia Tributaria, the Spanish tax agency, disputes two things. The first is a plain error: when calculating the gain it forgot to add to the acquisition value 6,100 € of notary's fees and tax on the original purchase, which Irene had documented. In the example, that accounts for about 1,400 € of the tax. The second goes to the substance: the Agency denies that the new flat ever became her main home because of the date on which Irene moved in, and that explains the rest. Irene has one month and two possible routes. She does not know which to choose, or whether she can use both.
Two routes that cannot be followed at the same time
Article 222 of the Ley General Tributaria, Spain's General Tax Law, sums it up. The appeal for reconsideration (Recurso de Reposición) is optional: you may lodge it or not. If you do, it comes before the economic-administrative claim (Reclamación Económico-Administrativa), and until it is decided, expressly or by silence, no claim can be made. If someone lodges both against the same act within the deadline, the first is processed and the second is declared inadmissible.
So, against an assessment there are two paths:
- Reconsideration and, if that does not satisfy you, a claim. First you ask the same office to correct it; then, if necessary, you go to the tribunal.
- A claim straight away. Reconsideration is skipped and you go directly to the economic-administrative tribunal.
What you cannot do is lodge both at once.
The differences that matter
| Aspect | Appeal for reconsideration | Economic-administrative claim |
|---|---|---|
| Who decides | The same body that issued the act (article 225.1) | An economic-administrative tribunal, separate from tax management |
| Deadline to lodge | One month from notification (article 223.1) | One month from notification (article 235.1) |
| Deadline to decide | One month from lodging (article 225.4) | One year from lodging (article 240.1) |
| If they do not decide in time | After one month, you can treat it as dismissed and bring a claim (article 225.5) | After one year, you can treat it as dismissed and move on |
| Can your position be made worse? | No (article 223.4) | No (article 237.1) |
| Initial document | With the arguments | May simply ask for the claim to be treated as lodged, with arguments later (article 235.2) |
| Afterwards | Economic-administrative claim | Further administrative appeal or the contentious-administrative courts, as the case may be |
In practice, how long each actually takes depends on the workload of each office and each tribunal; the legal deadlines are the framework, not a guarantee.
When reconsideration fits
Reconsideration works well when the assessment contains an error the office itself can acknowledge without changing its view: a figure copied wrongly, a document provided that was not taken into account, a justified expense that was not added. That is exactly Irene's first objection. For whoever issued the act it is easy to correct, and they do not have to admit that their interpretation was wrong.
It also has an advantage when it comes to suspension. Article 224.3 allows enforcement to be suspended without a guarantee when it appears that, in issuing the act, there may have been "an arithmetical, material or factual error". With an error like the notary's fees, that route is available for the part affected.
And reconsideration puts every issue in the file under review, whether raised or not, without the appellant's position being made worse (article 223.4).
When going straight to a claim fits
When the disagreement is about interpretation, asking the same office to change its view rarely works. If the Agency has decided that Irene's new flat was not her main home, reconsideration will probably confirm the assessment, and time will have been used up. An economic-administrative tribunal, which takes no part in managing the tax, looks at the matter from another angle.
A claim also allows you to lodge a short document within the month, which only identifies the act and asks for the claim to be treated as lodged, and to put forward the arguments when the tribunal makes the file available. That gives time to prepare the argument on the main home calmly: the guide on the requirements for the reinvestment exemption shows which pieces of evidence tend to carry weight.
The document is addressed to the body that issued the act, which forwards it to the tribunal with the file (article 235.3). If you are obliged to deal with the authorities electronically, it is filed through its electronic portal (article 235.5).
Reconsideration and a claim share the same deadline: one month from the day after notification, counted from date to date. If it passes without an appeal, the assessment becomes final, and all that remains are extraordinary review procedures, which are much narrower. If the notification was electronic and was not opened, the month may have started without your knowing; this is explained in I was notified electronically and did not notice.
The answer for a mixed case like Irene's
Irene has an obvious error and a disagreement on substance in the same assessment. There are two reasonable ways to approach it:
- Reconsideration on both grounds. You ask for the error to be corrected and argue the substance. If the office corrects the error and upholds the rest, you bring a claim before the tribunal against the reconsideration decision, with one month from its notification. Cost: a few more weeks of procedure.
- A claim straight away on both grounds. Everything goes to the tribunal, which may take far longer to recognise an error that the office would have corrected quickly.
With Irene's dates, notified on 14 September, she has until 14 October 2026 to lodge either of the two. If she chooses reconsideration and the office does not reply within a month, she can bring a claim, treating it as dismissed.
In cases like this the first option usually makes sense, but it depends on the relative weight of the error and the substance, and on how payment is to be handled. Neither guarantees the outcome. If you have the assessment and are unsure, you can send it with your earlier arguments through the letter-from-Hacienda form (Hacienda being the everyday name for the Spanish tax office) before the month moves on.
Payment while the appeal is pending
Appealing does not suspend collection of the tax. If you do not want to pay while it is decided, you have to ask for suspension and provide a guarantee (article 224.1 for reconsideration; in a claim, the tribunal and the office apply their own suspension rules). If you prefer to pay and appeal, what you paid is refunded with interest if you win. And if you cannot pay, the guide to deferring a debt arising from a regularisation explains how to avoid the surcharges of the enforcement period.
Remember that appealing the assessment loses the reduction for agreement on any penalty that may come later. The effect is explained in is the penalty appealed separately from the assessment?.
Choosing the appeal route and preparing appeals for reconsideration and claims is described on the Salama Tax page on letters from Hacienda.