The complementaria: appeal Spain’s “second tax bill” after you buy
You paid the transfer tax on your purchase. Months later a second bill arrives — a liquidación complementaria — saying the property is worth more than you declared, so you owe extra tax plus interest. It feels official and final. It is neither: it is provisional, and you have one month to fight it.
- ITP · TRLITP RDLeg 1/1993
- Valor de referencia · Ley 11/2021
- Comprobación · art. 57 LGT
- TPC · art. 135 LGT
01A second bill from a different tax office
When you buy a resale home in Spain you self-assess and pay ITP (Impuesto de Transmisiones Patrimoniales) to the regional tax authority (Hacienda autonómica) — not the state agency AEAT. That regional office can, up to four years later, decide the value you declared was too low and issue a liquidación complementaria (locals call it a “paralela”) for the difference, plus interest for late payment, and occasionally a penalty on top.
The key thing owners miss: this assessment is provisional. It is the tax office’s opinion of value, not a court judgment. It can be — and very often is — overturned, because the office must properly justify (motivar) how it reached that value. A desktop valuation that never looked at your specific, perhaps older or defective, property is a classic ground for annulment.
02Why it arrived: the valor de referencia
Since 1 January 2022 (Ley 11/2021), the taxable base for ITP is the Catastro’s valor de referencia whenever that is higher than the price you actually paid. If you declared tax on the purchase price and the reference value was higher, a complementaria for the gap is almost automatic.
The reference value is a presumed value, not an untouchable one. You must pay or declare on it first, but you can then challenge it — by requesting a rectificación de la autoliquidación or by appealing the complementaria — with evidence that the market value is lower: an independent appraisal (tasación), the deed, photos, defects, comparable sales. For older or pre-2022 purchases with no reference value, the office instead runs a comprobación de valores (art. 57 LGT) using expert methods — and those are the most fragile of all.
Got a complementaria? See if it is worth appealing.
Send us the assessment and your purchase details. You get a clear read on the grounds, the odds, and a step-by-step appeal (reposición / TEAR / TPC) before your one-month deadline — checked by an expert.
03The three ways to fight it
You have one month from the day after notification. Three routes, and you can combine them:
- Recurso de reposición — an appeal to the very office that issued the bill. Optional, cheap, one month. Often worth it as a first shot when the motivación is weak.
- Reclamación económico-administrativa (TEAR) — a claim before the regional economic-administrative tribunal, one month. You can go straight here (skipping reposición). This is where most badly-justified value checks are annulled.
- Tasación pericial contradictoria (TPC) — you appoint your own expert to counter the administration’s valuation. Requesting it within the month automatically suspends payment of the complementaria, with no guarantee required — which is exactly why it is such a strong move: the clock stops and the bill freezes while the values are compared.
04Deadlines, payment and suspension
The one-month window is strict. Miss it and the provisional bill becomes final and enforceable — with surcharges if it goes to collection (apremio). Do not ignore the letter because it looks intimidating; a complementaria left unanswered is the one that actually costs you.
You do not have to pay to appeal. A reposición or TEAR claim can be filed with a request to suspend, and a TPC suspends automatically. Interest keeps accruing in the background, so a fast, well-grounded appeal is cheaper than a slow one — but paying a wrong bill “to be safe” and reclaiming later is the expensive path.
05The classic mistakes (each costs real money)
- Paying it out of fear. The bill is provisional and appealable in one month; most weak value checks are overturned. Paying first, reclaiming later, is slow and often unnecessary.
- Missing the one-month deadline. After it, the assessment is final and heads to enforced collection with surcharges. This is the single most expensive error.
- Not using the TPC. It is the only route that freezes payment for free while an independent expert re-values the property.
- Declaring below the valor de referencia in the first place. If you are still buying, declaring on the reference value (or planning the challenge in advance) avoids the complementaria altogether.
- Assuming the office got the value right. Value checks are routinely annulled for poor motivación — a generic method, no site visit, no account of your property’s real state.
“RightNOW was born from a very simple foreigner’s pain: in Spain you can be right and still lose months to one form, one deadline or one wrong next step. So here we first put the facts in order — and only then choose the action.”
Made by foreigners, for foreignersFAQFrequently asked questions
Do I have to pay the complementaria before appealing?
No. You can appeal (reposición or TEAR) with a request to suspend, and a tasación pericial contradictoria suspends payment automatically, without a guarantee. Only an unanswered, final bill must be paid.
How long do I have?
One month from the day after you receive the notification — for the reposición, the TEAR claim and the TPC alike. It is a strict deadline.
What are my chances?
It depends on how the office justified the value. Value checks with a generic, desk-based method and no real look at your property are frequently annulled; a valor de referencia challenge turns on an independent appraisal showing a lower market value.
Can they really go back years?
Yes — the tax office has four years from the filing deadline to review and issue a complementaria. After four years the tax prescribes.
Can RightNOW handle the appeal?
The €59 plan reads your assessment, tells you the grounds and odds, and gives you the exact appeal to file. If you want it fully run — including the TPC and an appraiser — case management is quoted from €199.
Informational material, not tax advice for your individual case. Procedure and deadlines verified against the LGT (arts. 57, 135), TRLITP (RDLeg 1/1993) and Ley 11/2021 (valor de referencia) as of July 2026; outcomes depend on the specific assessment and region.
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