Investing in rental property remains one of the safest and most profitable strategies for those seeking to generate stable, long-term income. With rental demand growing year after year, owning a well-managed property can be an excellent way to protect your savings and generate a return on your investment.

However, one of the issues that raises the most questions among property owners is how to report rental income and which expenses can be legally deducted. A thorough understanding of these rules not only helps avoid problems with the tax authorities but also allows you to maximize your profits.

Below, we explain in a clear and practical way how rental income is reported on your individual income tax return (IRPF), which expenses are considered deductible, and what tips will help you manage your investment with peace of mind.

What to Report and When

If you own a rental property, the income you receive from that rental must be reported as real estate income on your annual income tax return.

This means you must include rental income received during the tax year— that is, the calendar year preceding the tax return. For example, rental income earned in 2025 is reported on the 2026 tax return.

Income refers to the total amount received from the tenant, before any deductions have been made. From that figure, you can subtract deductible expenses, which are those directly related to earning that income.

In short, the formula is simple:

Net income = Revenue – Deductible expenses

The final result will be the amount to which the applicable tax rate will be applied based on your taxable income.

 

When You Must Report Rental Income

The obligation to report rental income applies whenever you receive income from renting a residence to a third party, regardless of the type of lease agreement:

• Standard long-term rental.
• Short-term or seasonal rental.
• Vacation rental.
• Renting rooms within a home.

The important thing is that there be financial compensation. In all cases, it is advisable to keep the contracts and payment receipts in case the Tax Agency requests documentation.

Expenses You Can Deduct as a Homeowner

One of the major advantages of properly reporting rental income is that you can deduct the expenses necessary to maintain the property in good condition and generate income. This allows you to significantly reduce the amount on which you pay taxes.

Below, we list the main deductible expenses:

1. Interest and Financial Expenses

If you purchased the home with a mortgage, you can deduct the interest paid on the loan (not the principal paid off) and other related financial expenses, such as bank fees or insurance linked to the loan.

2. Municipal Taxes and Fees

Taxes on residential property, such as property tax ( IBI ) or garbage collection fees, are deductible as long as they are not passed on to the tenant.

3. Repairs and Maintenance

Maintenance and repair expenses necessary to keep the home livable are tax-deductible: painting, electrical repairs, replacement of appliances, boiler repairs, etc.
This does not include work that constitutes an improvement or expansion of the property, as such expenses are depreciated over time and are not deducted all at once.

4. Depreciation of the property

The law allows for an annual deduction based on the depreciation of the property’s construction value (excluding the value of the land). This depreciation offsets the natural wear and tear on the home over the years.

5. Insurance, Community, and Utilities

Home insurance, rent default insurance, homeowners’ association fees, and electricity, water, and gas bills are also tax-deductible, provided they are paid by the owner.

6. Fees and Professional Services

If you have hired a real estate agency, an agent, or a lawyer to manage the rental or draft the lease, their fees may also be included as a deductible expense.

7. Other Necessary Expenses

Any other justified expense that is essential for maintaining the property in a condition suitable for rental may be deducted. For example,energy performance certificates, listings on real estate websites, or administrative fees.

 

Tax breaks for renting a primary residence

In addition to deductible expenses, there are tax breaks that allow you to further reduce your net income if the rental property is used as the tenant’s primary residence.

Until recently, this reduction was generally 60%, but since the Housing Act took effect, the percentages have been adjusted based on certain circumstances, such as whether the property is located in a high-demand area or is rented to young people.

These reductions can reach 70% or even 90% in specific cases, which represents a significant tax benefit for those who rent out their homes under regulated conditions.

In any case, the reduction applies only when the lease is properly registered and the residence is the tenant’s primary residence.

 

Documents You Should Keep

In order to properly document the expenses you’ve deducted and the income you’ve received, it’s important to keep all documentation related to the rental.

We recommend that you save:

• The signed lease agreement.
• Proof of the tenant’s monthly transfers or payments.
• Invoices for repairs, maintenance, or supplies.
• Property tax, homeowners’ association, insurance, or mortgage bills.
• Receipts for professional services or administrative expenses.

Keeping this documentation will make filing your tax return easier and help you avoid problems if the tax authorities request an audit.

 

What happens if you only rent out your place part of the year?

The property may have been rented out for only a few months of the year. In that case, income and expenses must be reported in proportion to the time during which they were incurred.

During the months when the property was not rented, no income is reported; however, an imputed real estate income may be applied for the time it was vacant. The Tax Agency automatically performs this calculation based on the cadastral value.

Tips for Filing Your Tax Return Without Errors

Reporting rental income isn’t complicated, but it does require attention to detail. Here are some practical tips for doing it correctly:

• Always report the actual income you receive, even if the tenant pays in cash or by other means.
• Don’t confuse repairs with improvements: repairs are tax-deductible, while improvements are depreciated.
• Be sure to claim the tax deductions if your rental meets the requirements.
• Keep all receipts and invoices: without them, you won’t be able to prove your expenses.
• If you have any questions, consult a tax advisor or a specialized tax professional.

Proper planning and documentation can make the difference between paying more taxes and taking full advantage of the deductions you’re entitled to.

 

Rental Housing as a Long-Term Investment

Beyond the tax implications, renting a home represents a solid investment opportunity with long-term potential. Real estate remains a tangible, stable asset with the potential for appreciation, especially when it comes to new-construction homes that are energy-efficient and well-located.

New homes offer significant advantages over resale homes:

• Energy efficiency, which improves tenant comfort and reduces costs.
• Less maintenance and longer service life for the facilities.
• Modern design, sustainable materials, and compliance with current regulations.
• Greater appeal to renters looking for modern, comfortable homes.

For all these reasons, those who purchase a newly built home to rent out can expect a more profitable and sustainable investment with fewer issues.

 

Rental Market Trends

The rental market in Spain continues to evolve. Demand for modern, energy-efficient homes in areas with good transportation links continues to rise. Younger generations are looking for comfortable homes with open spaces, plenty of natural light, and energy-efficient technology.

This has sparked interest among many investors in new-construction homes, where rental returns and stability go hand in hand with a reduced need for repairs or renovations.

In addition, European sustainability policies and energy standards have bolstered the value of these types of assets. New homes have established themselves as a smart investment for those seeking a return on their investment without sacrificing peace of mind.

 

Conclusion: Manage your investment with information and peace of mind

Reporting rental income and taking advantage of available deductions is an essential part of sound wealth management. Understanding the rules, keeping your documentation organized, and taking advantage of tax benefits will allow you to optimize your investment and avoid unexpected problems.

If you’re thinking about investing in real estate or want to learn in detail how to maximize the return on your property, at Culmia we offer a practical guide with all the information you need.

👉 Download Culmia’s Guide to Investing in Real Estate here