Short answer: for a rental property in Spain to be worth it as an investment, aim for a gross yield above 7 %, a net yield above 4 % and a cash-on-cash return (ROCE) above 12 %. Below those numbers, a flat rarely justifies the risk and the work versus simpler alternatives such as an index fund.
Inversor Particular helps first-time investors buy their first rental property in Spain without the rookie mistakes. The most common question we get: at what number does a flat "actually pay"? Here is the benchmark we use, what each number measures and when to walk away.
The three metrics that matter (and their thresholds)
| Metric | What it measures | Threshold |
|---|---|---|
| Gross yield | Whether the flat pays "on paper" — to filter fast | > 7 % |
| Net yield | What you actually earn after running costs | > 4 % |
| Cash-on-cash (ROCE) | What the money you put in returns, with a mortgage | > 12 % |
What is gross yield, and why on total cost?
Gross yield is one year of rent divided by what it costs you to get the flat rented. The key: total investment is not just the price — it's price + taxes + buying costs + renovation. Many listings compute it on the price alone so it looks higher; computing it on total cost is more conservative and saves you surprises.
According to idealista's yield reports, the average gross rental yield in Spain has hovered around 7 % in recent years, with wide variation by city. That's why we set the bar there: below 7 %, the margin is usually too thin.
What about net yield?
Net yield subtracts the costs the flat carries even when rented: property tax (IBI), community fees, insurance, maintenance and the months it may sit empty (vacancy). It's the one that decides, because it's closest to what reaches your pocket (before mortgage and personal taxes). Below 4 % net, the flat works for the costs, not for you.
What is ROCE, and why does a mortgage change everything?
ROCE (cash-on-cash) measures what the money you put in returns — not the value of the flat. With a mortgage you put in less of your own cash, so that cash can return far more: hence the 12 % bar. But beware — a flat that only "works" on ROCE yet leaves no positive monthly cashflow is more fragile than it looks. ROCE excites; positive cashflow lets you sleep.
Watch out: the listing number almost always lies
The idea is simple in concept: take one year of rent and compare it with what it truly costs to get the flat rented (price + taxes + buying costs + renovation). The catch is that a listing boasting an 8 % yield "on the price" can drop to a 4 % real net once you add taxes, renovation, running costs and a couple of empty months. That gap is exactly what separates a good investment from a trap — and it's where rookies fool themselves most.
So before falling in love with a flat, run the numbers properly on the total cost, with a prudent local rent and real mortgage rates. A proper calculator gives you the gross, net and cash-on-cash returns in two minutes — accounting for taxes, costs and vacancy — instead of guessing from the headline figure.
When should you walk away?
When, after running the numbers on total cost with a prudent local rent, it doesn't reach the thresholds — and the seller won't drop to a price where it does. It's not "no": it's maths. In real estate, the money is made when you buy, not when you sell.
FAQ
Is a 5 % yield good?
Usually too low for a first investment property: little room for costs, surprises and vacancy. Our benchmark is above 7 % gross. A 5 % only makes sense with strong, reasonably safe appreciation in the area.
Gross or net?
Both: gross to filter and compare; net to decide, because it's what you actually earn.
On the price or the total cost?
On the total cost (price + taxes + buying costs + renovation). Computing it on the price alone inflates the number.
What's the average yield in Spain?
Per idealista, gross yield has averaged around 7 % in recent years, with wide variation by city and neighbourhood. Always check the current figure for your area.
Sources: idealista yield reports; thresholds and method by Inversor Particular. Educational and indicative content, not financial, legal or tax advice. For your specific case, consult a professional.