With some spare cash on hand and hearing friends talk about property investment, I’ve started getting interested myself. Based in Barcelona, I’ve been thinking about buying a small apartment to rent out. The goal is to become a landlord, beat inflation, and earn a bit of extra income.
At first, it seemed like a great idea. Spanish property prices are rising, but the rental market is also booming. A quick browse on Idealista suggested that the rental yields looked promising. However, after doing the math, I realized that calculating the actual return on investment for Spanish property isn’t so simple. The real cost comes from all the various taxes and fees.
How is Rental Yield Actually Calculated?
What many people refer to as return on investment is actually the ‘gross yield,’ and the formula is quite simple:
* 100%
But this calculation is too idealistic as it doesn’t account for holding costs. What really matters to us is the ‘net yield,’ which requires deducting all expenses:
/ Property Purchase Price) * 100%

Those ‘Hidden’ Annual Expenses
This is where the devil is in the details. I’ve compiled a list of factors affecting the rental yield, which mainly include the following. Let me know if I’ve missed anything:
| Expense Item | Approximate Cost/Description |
| IBI (Property Tax) | Ranges from 0.4% to 1.1% of the cadastral value (valor catastral), paid annually. |
| Comunidad (Community Fees) | Depends on the building’s facilities and services, can be anywhere from tens to hundreds of euros per month. |
| Seguro de Hogar (Home Insurance) | Mandatory, roughly €200-€400 per year. |
| Mantenimiento (Maintenance) | Set aside a budget for repairs like broken appliances or repainting. A sudden expense can be painful for the wallet. |
| Impuestos sobre la Renta (Income Tax) | This is a big one! Non-tax residents generally face a flat rate of 19% with few deductions. |
| Periodos Vacíos (Vacancy Periods) | Don’t expect the property to be rented out 365 days a year. There will always be gaps between tenants. Factoring in a one-month vacancy period is a safe bet. |
When you add it all up, a property advertised with a 5% gross yield might only have a net yield of 2.5% - 3.5%, or even lower. Of course, this doesn’t include the property’s own capital appreciation, which is a long-term gain. In the short term, it’s all about the rental income. For those who have experience with this, what kind of returns are you seeing in practice? Feel free to share your thoughts and experiences!