Question 1

What are public auctions and what seized assets do they offer?

Accepted Answer

[Public auctions](/en/subastas-publicas) are legal procedures organised by the various State administrations and courts to sell seized or confiscated assets in order to settle their former owners' debts. In these processes any citizen or investor can bid for and acquire residential [properties](/en/subastas-publicas-viviendas), [vehicles](/en/subastas-publicas-vehiculos), commercial premises, rural estates and machinery at prices well below market value.

Question 2

Which bodies hold public auctions and where are they published?

Accepted Answer

In Spain, public auctions are organised by multiple entities: courts ([judicial auctions](/en/subastas-judiciales)), the [Tax Agency](/en/subastas-hacienda-aeat) (Hacienda), [Social Security](/en/subastas-seguridad-social), local councils and the State Asset body (Patrimonio). Although most are officially published on the [BOE](/en/subastas-boe) Electronic Auction Portal, searching and filtering across each body is a slow process. subastAI centralises all public auctions in Spain in a single smart search engine updated in real time.

Question 3

How do I participate and bid in a public auction online?

Accepted Answer

Spain's auction system is 100% electronic. To participate, register on the relevant official portal using your digital certificate, electronic ID or Cl@ve. Once registered, select the asset you are interested in and make a prior payment (deposit or consignación) — generally 5% of the asset's auction value — to be legally enabled to place bids.

Question 4

Is it safe to invest in public auctions or are there hidden risks?

Accepted Answer

Buying at public auctions is completely legal and highly profitable, but it carries significant risks if you cannot read the fine print. When you win a property you could inherit property tax (IBI) arrears, unpaid community fees or prior registered liens such as existing mortgages. To eliminate this risk, subastAI's AI acts as your legal auditor, reading auction notices and registry entries to warn you of any danger before you bid.

Question 5

How do I calculate the real value and return of an auctioned asset?

Accepted Answer

Success in public auctions depends on knowing your exact profit margin. It is not enough to look at the [starting price](/en/glossary): you must subtract taxes (ITP), outstanding debts and refurbishment costs, and compare the result against the current market value of that street or municipality. subastAI's technology automatically cross-references Cadastre data, court liens and market prices to deliver an instant financial and profitability audit.

Preguntas Frecuentes — Publicas

What are public auctions and what seized assets do they offer?

Which bodies hold public auctions and where are they published?

How do I participate and bid in a public auction online?

Is it safe to invest in public auctions or are there hidden risks?

How do I calculate the real value and return of an auctioned asset?