What is the difference between buying a defaulted mortgage and buying the flat?

Buying the mortgage, the debt, gives you the right to collect and, if you do not collect, to enforce. You do not own the property at the outset. Buying the flat, at auction or from a bank, gives you ownership, with the registration steps, any surviving charges and any occupants.

Can an individual buy the debt instead of the flat?

Yes. Whole portfolios are bought by funds, but individuals can access the single deals that funds or their servicers bring to market, such as assignments of individual loans. The main barrier is not minimum capital but access to information.

What happens if I buy the debt and the debtor pays?

You collect without enforcing. They may pay what they owe, accept a haircut where you forgive part in exchange for the rest, agree a refinancing or hand over the property as a deed in lieu. An amicable deal is usually faster than the court route and avoids its costs.

Which is faster, buying the debt or buying at auction?

An auction has short, fixed milestones: twenty calendar days of bidding and twenty days from the close to pay if the bid reaches 70 per cent. With debt the timetable is set by the court and the debtor's opposition, and mortgage enforcement can take several years, unless there is an agreement first.

Can the purchase be financed in each route?

A bank-owned flat, yes, because it follows the timing of an ordinary sale. At auction the deposit is lodged before bidding and the balance within twenty days, a timetable that does not fit a standard mortgage. With debt, the price is negotiated with the loan holder.

Buy the debt or buy the flat? What changes for the investor

Buying a non-performing loan (NPL) or buying the property at auction or from a bank: what you acquire in each case, the risks you take, the capital you need and the timing.

Ángel Visedo Tomás, Fundador de InvertirDeudaUpdated 8 October 2026

What exactly do you buy in each case?

When you buy discounted debt you are not buying the property: you are buying the right to collect that debt and, if it has a mortgage behind it, to enforce it if the debtor still does not pay. You step into the creditor's rights, including the right to enforce the mortgage. If the debtor reaches an agreement and pays part of it, you collect without enforcing; if they pay nothing, you go to enforcement, with its deadlines and costs.

When you buy the flat, it is a different deal. At a judicial auction you bid for the asset, and if you are awarded it, it is yours, with the charges ranking ahead of the claim being enforced and whatever occupancy it has. With a bank-owned flat ownership has already changed hands: the owner is the bank or the vehicle the portfolio was transferred to, and the sale is an ordinary one, with a deed before a notary.

Between the two there is a middle route, the cesión de remate: the enforcing creditor, who is the one bidding, assigns the winning bid to a third party, who is awarded the property without having bid, at the price agreed with the creditor (article 647.3 of the Spanish Civil Procedure Act).

The comparison, point by point

Buying the debt versus buying the flat: what changes for the investor
Aspect	Buying the debt (NPL or loan assignment)	Buying the flat (judicial auction or bank-owned flat)
What you buy	the right to collect the debt and, if unpaid, to enforce the collateral; you do not own the property at the outset	ownership of the property, with the registration steps and any occupants
How it can end	agreement with the debtor (payment, haircut or refinancing), deed in lieu, enforcement of the collateral or sale of the loan to another investor	with the property in your name; what you do next depends on its condition, charges and occupancy
Specific risks	litigious credit redemption (article 1535 of the Civil Code), unfair clause objections, debtor insolvency and, since 2025, nobody bidding so you cannot request the award (article 647.2)	at auction, surviving prior charges and occupancy; with a bank-owned flat, possession not guaranteed and a tenant entitled to stay (article 13.1 of the Urban Leases Act)
Timing	mortgage enforcement can take several years, depending on the court and the debtor's opposition; an amicable deal is measured in months	at auction, twenty calendar days of bidding and twenty days from the close to pay if you reach 70 per cent (articles 649.1 and 670.1); with a bank-owned flat, the timing of an ordinary sale
Capital	the price you negotiate with the loan holder, plus the capital to see the court process through	at auction, the deposit of 20 per cent of the value, with a minimum of 1,000 euros (article 669.1), and the balance in cash; a bank-owned flat can be financed
Who can do it	individuals access the single deals that funds or their servicers bring to market; whole portfolios are bought by funds	at auction, anyone registered on the BOE auction portal with electronic ID and signature; with a bank-owned flat, any buyer

Which risks come with buying the debt?

Litigious credit redemption: if you buy the loan once litigation has started, the debtor can extinguish it by paying you what you paid, plus costs and interest (article 1535 of the Civil Code). Your discount becomes theirs. How it applies to bulk portfolio purchases is debated in the courts.
Unfair clauses: a consumer debtor can oppose enforcement on these grounds, and the judge examines them even on their own initiative. They can suspend enforcement, reduce the claim or make it unviable.
Personal insolvency: enforcement can be suspended and the debt affected by the discharge of unpaid liabilities.
An auction with no bids: in proceedings started from 3 April 2025, if nobody bids the creditor cannot request the award (article 647.2). That is why whoever buys the debt usually has to bid themselves, which they can do without lodging a deposit.
Timing: with the debt you do not control the court's calendar, and a long process reduces the result even if the money is recovered in the end.

Which risks come with buying the flat?

Prior charges: at a judicial auction, charges ranking ahead of the claim being enforced survive and, just by bidding, you accept taking them on (article 669.2).
Occupancy: if you are awarded an occupied flat at auction, eviction of occupants without title through the enforcement route must be requested within a year of the acquisition. After that year, it takes the corresponding full trial.
Bid thresholds: being the highest bidder is not enough. Below 70 per cent of the auction value, the debtor has ten days to present someone who improves the bid (article 670.3).
Bank-owned flat with a tenant: if the lease was terminated by mortgage enforcement within its first five years, seven if the landlord was a company, the tenant can stay until that period ends (article 13.1 of the Urban Leases Act).
Condition of the property: at auction you often cannot see inside, and a bank-owned flat closed for years may need more work than expected.

The terms, in the glossary

Loan assignment, remate assignment, registered charge, Land Registry extract: the comparison rests on a dozen words worth having clear before choosing a route. They are defined in the glossary, with the guide that develops each one.

See loan assignment in the glossary

How much capital and time does each route need?

At a judicial auction you need cash for the deposit of 20 per cent of the asset's value, with a minimum of 1,000 euros if that percentage is lower (article 669.1 of the Civil Procedure Act), and to pay the balance within twenty days of the close if your bid reaches 70 per cent (article 670.1). That timetable does not fit an ordinary mortgage application. A bank-owned flat is bought on the timing of a normal sale and can be financed.

With debt, the price comes from negotiation with the loan holder, and on top of it goes the capital needed to see the court process through: lawyer, court agent, taxes and the time your money is tied up. The same gain in eight months or in three years is a very different investment.

How to choose between buying the debt and buying the flat, asset by asset

Read the assetLand Registry extract, charges and their ranking, and the real value of the collateral on its street and in its condition, not the appraisal in the deed.
Check the stage of the processIf litigation has started, litigious credit redemption can take your discount; if an auction is scheduled, the thresholds of article 670 apply.
Check occupancyWho is inside and on what basis changes the timetable and the cost, whether you buy the debt or the flat.
Match capital and timetableDeposit and payment on short deadlines for an auction; negotiated price plus the court process for debt.
Work out three scenariosA good, a neutral and an adverse one, with their costs and timing, and go in only if the adverse one is a loss you can bear.

Which one works out better?

Neither in the abstract. Buying the debt gets you into the chain earlier and leaves more variables in your hands, but the analysis is far more demanding and the outcome may be an agreement with the debtor rather than the property. Buying the flat at auction can leave more potential margin, because the price is set by a collection procedure, in exchange for surviving charges, possible occupancy and a timetable you do not control. A bank-owned flat carries less uncertainty and usually less margin, because the bank has already absorbed the hardest part of the discount.

We do not publish a typical return for either route because there is no serious source measuring it for individual investors in Spain. What helps is working out each deal with its own numbers, and not confusing discount with profit: taxes, charges, occupancy and waiting all come out of that margin.

The middle route: remate assignment

If you want to end up with the property but negotiate the price with the creditor instead of bidding blind, remate assignment is the mechanism that allows it. It has its own deadlines, five days to sign the document, and its own risks, such as another bidder offering more.

Read how remate assignment works

Investing in discounted debt or property carries a real risk of loss and uncertain timing. This guide is for information only and is not financial or legal advice: for a specific deal, analyse the data and consult a professional.

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Frequently asked questions

What is the difference between buying a defaulted mortgage and buying the flat?: Buying the mortgage, the debt, gives you the right to collect and, if you do not collect, to enforce. You do not own the property at the outset. Buying the flat, at auction or from a bank, gives you ownership, with the registration steps, any surviving charges and any occupants.
Can an individual buy the debt instead of the flat?: Yes. Whole portfolios are bought by funds, but individuals can access the single deals that funds or their servicers bring to market, such as assignments of individual loans. The main barrier is not minimum capital but access to information.
What happens if I buy the debt and the debtor pays?: You collect without enforcing. They may pay what they owe, accept a haircut where you forgive part in exchange for the rest, agree a refinancing or hand over the property as a deed in lieu. An amicable deal is usually faster than the court route and avoids its costs.
Which is faster, buying the debt or buying at auction?: An auction has short, fixed milestones: twenty calendar days of bidding and twenty days from the close to pay if the bid reaches 70 per cent. With debt the timetable is set by the court and the debtor's opposition, and mortgage enforcement can take several years, unless there is an agreement first.
Can the purchase be financed in each route?: A bank-owned flat, yes, because it follows the timing of an ordinary sale. At auction the deposit is lodged before bidding and the balance within twenty days, a timetable that does not fit a standard mortgage. With debt, the price is negotiated with the loan holder.