If you’ve bought an investment property in Spain through a company, a Sociedad Limitada, and it’s generating rental income, at some point you’ll face a question that doesn’t get much coverage: what do you actually do with the profits once they start accumulating?
The obvious answer is to take them out as dividends. But the moment you do that, you trigger personal tax. The whole point of the SL structure is that profits retained inside the company are taxed at the 25% corporate rate (or 15% in the first two profitable years), and they stay there, compounding, until you choose to extract them. Every euro you leave in the company is a euro that can work for you without the additional layer of personal income tax eating into it.
The other option is to leave the money sitting in the company’s bank account. But if you’ve looked at the Spanish savings market, you’ll know that’s not a particularly attractive proposition. Major Spanish banks like Santander offer 0% interest on standard current accounts, and even dedicated savings products from the likes of Openbank or Bankinter top out at around 2% APR, often with promotional conditions attached. Fixed-term deposits through platforms like Raisin can stretch a little further, but the rates are still modest compared to what property can deliver. For a company holding account with a fintech like Revolut Business, you’re typically earning nothing at all.
So the real question becomes: how do you put that money to work inside the company?
This article is about my first attempt at doing exactly that. I invested €1,000 into a property flip project run by an Alicante-based investment company, using a participative loan structure. The money actually came from a personal loan I made to the company, since this was before tenants were in place and rental income was flowing. I wanted to test the idea quickly so I’d have a clear yes or no before committing to it as a long-term strategy. If the process turned out to be clunky or the admin didn’t work, I wanted to know before rental profits started building up and I needed a plan for them.
Why Reinvesting Inside the SL Makes Sense
When I set up my Spanish SL to hold my rental property in Elche, the tax efficiency was a key part of the rationale. But tax efficiency only matters if you actually use it. If the profits just sit in a bank account earning next to nothing, the structure is doing half its job.
The logic is straightforward. Rental income comes in, running costs go out, and what’s left is profit inside the company. That profit has already been taxed at the corporate rate. If I reinvest it into another property project, the returns on that investment also stay inside the company. No additional tax until I decide to take money out personally.
Compare that to extracting the profits as dividends, paying personal tax on them, and then investing from your personal account. You’re starting with less capital, and any returns are taxed again at your personal rate. The compounding difference over time is significant.
The challenge for a small SL like mine, one property with modest rental income, is finding investment opportunities that work at a scale that makes sense. I’m not in a position to buy a second property outright. I couldn’t get a Spanish mortgage for the first one, so leveraging into a second isn’t straightforward either. But I can participate in someone else’s project.
What a Participative Loan Actually Is
The vehicle I used is called a préstamo participativo, a participative loan. It’s a well-established instrument under Spanish law, regulated by Article 20 of Royal Decree-Law 7/1996. It’s not exotic or obscure. It’s a standard structure used across Spanish business.
The basic concept: you lend money to a company that’s running a specific project. In return, instead of receiving a fixed interest rate, your return is linked to the project’s actual performance. If the project does well, you do well. If it underperforms, your return is lower. In theory, you could lose your capital, though the structure I invested in has specific protections around that.
In my case, the project is a property flip. The investment company buys a property at a competitive price, refurbishes it, and sells it. The difference between total costs and the sale price is the profit, which is split between investors and the company according to a pre-agreed ratio. In this case, 85% to investors and 15% to the company as a success fee.
The key features of the arrangement: it’s a loan from my SL to the investment company, not an equity stake, so I don’t become a shareholder or co-owner of the property. The return is variable, linked to the actual profit on the project. The estimated timeline was eight months from purchase to sale, which was the shortest project I could find. That mattered because this was a test and I wanted to see the full cycle play out as quickly as possible. My capital is returned, along with my share of the profit, within 30 days of the property sale completing. The contract was signed electronically via DocuSign, with no notary required for this type of private document.
For my €1,000 test investment in a project with a total investment value of over €500,000, the platform’s estimated annual return was 12.46%, which translated to an estimated profit of €83 on my stake. Not life-changing numbers, obviously. But then, this wasn’t about the return. It was about testing the plumbing.
Why I Deliberately Started Small
I’m a cautious investor by nature, and I don’t recommend anything I haven’t tested myself. Before I commit meaningful amounts of my company’s rental profits to this kind of investment, I wanted to see the whole process play out end to end.
I like to test things fast. I’d rather invest a small amount, run through the full cycle, get my yes or no, and then either scale up or move on. Sitting on an idea for months without data is not how I work. The €1,000 was enough to trigger the full paperwork trail, the tax filing, and the gestor’s involvement, without putting anything meaningful at risk.
The questions I needed answered weren’t really about the investment platform, which, for what it’s worth, was clean, well-designed, and gave me a clear dashboard showing my active projects, estimated returns, and downloadable fiscal documents. The questions were about the admin on my side: how does my gestor log this? What tax forms need filing? Is the process smooth enough that I could do this repeatedly, say every quarter, without it becoming an administrative headache?
Those are the things you can only learn by doing it.
The Admin: What Actually Happened
Here’s the step-by-step of what the process looked like from my side.
The contract. The investment company sent a loan agreement through DocuSign. It set out the project details, the amount, the profit split, the timeline, and the legal framework, all referencing Article 20 of RDL 7/1996. Straightforward to review, though I’d recommend reading the general conditions carefully, particularly around the duration clause. The company has the right to extend the project timeline if the property hasn’t sold within the initial period, which is worth understanding upfront.
The transfer. I sent €1,000 from my company’s Revolut Business account to the investment company’s Santander account. A standard bank transfer, nothing complicated.
The Modelo 600. This is where it gets interesting for anyone thinking about the tax side. It also makes me chuckle because it sounds like a Mexican beer, but unfortunately it’s rather less fun than that. A participative loan is classified as a transfer for the purposes of the Impuesto sobre Transmisiones Patrimoniales y Actos Jurídicos Documentados (transfer tax). That sounds alarming, but loans between companies are exempt under Article 45.I.B.15 of the transfer tax law. So a Modelo 600 needs to be filed with the regional tax authority, in my case the Agència Tributària Valenciana, but the amount payable is €0.
The investment company handled the filing, which was done electronically on 17 December 2025, and the signed Modelo 600 and the official receipt (justificante de registro) were both uploaded to my investor dashboard for download. That’s a nice touch: having the fiscal documentation available in one place rather than chasing it separately.
The gestor. I forwarded the contract, the Modelo 600, and the justificante to my gestor, who logged it in the company’s accounts. From his perspective it’s a straightforward receivable, a loan made by my company, to be returned with interest upon project completion. No complications, no surprises.
The entire admin process, from signing the contract to having everything logged with my gestor, took a matter of days. For a repeatable investment process, which is what I’m testing for, that’s exactly what I needed to see.
What I’m Watching For
The project is still live as I write this. The property was purchased in November 2025, the estimated sale date is July 2026, and I’ll update this article with the outcome once the project completes.
I want to see whether the eight-month timeline held, what the actual return was versus the 12.46% estimate, how smooth the exit process is when the money comes back, and how the return shows up in the company accounts from a corporate tax perspective. Those are the details that will determine whether I commit to this as a recurring strategy for the company’s rental profits.
If all goes well, and so far it has, the plan is to invest the company’s profits periodically into new projects rather than leaving them idle. The compounding effect of reinvesting within the SL, without triggering personal tax each time, is the whole point of the structure. It would be a waste not to use it.
A Note on Risk
A participative loan is not a deposit. Your capital is at risk. If the project loses money, if the property sells for less than the total investment, you could receive back less than you put in. The 85/15 profit split works in your favour when things go well, but it doesn’t protect you from losses.
The investment company I used has a track record of completed projects in the Alicante market, and the project economics looked solid to me: a purchase price well below estimated market value, a clearly defined scope of works, and a sale timeline that aligned with current market conditions. But I’m not a financial advisor, and this article is a factual account of what I did, not a recommendation that you do the same. If you’re considering something similar, talk to your gestor about how it would be treated in your company’s accounts and tax filings, and make sure you understand the contract terms, particularly around timeline extensions and what happens if the project doesn’t complete as planned.
The Bigger Picture
For UK buyers who’ve set up a Spanish SL to hold rental property, the conversation usually stops at “here’s how to set it up” and “here’s how the tax works.” What gets much less attention is what happens a year or two down the line, when the property is generating income and you need to decide what to do with it. Leaving profits in a bank account earning 0 to 2% is safe but unproductive. Extracting them triggers personal tax. Reinvesting them into property projects, in a market you already know, keeps the money working inside the tax-efficient structure you’ve built.
Starting with €1,000 was my way of making sure the process worked before committing more. So far, the admin has been clean, the documentation is solid, and the investment is tracking to plan. I’ll update this article when the project completes and I have real numbers to share.
This article is based on my own experience and is intended as a factual account rather than financial or tax advice. Your circumstances may differ. Always consult your gestor or tax advisor before making investment decisions through your company.