How to Report Rental Income: A Complete Guide

August 18, 2025

These days, renting an apartment is very common in Spain, both for those looking for a place to live and for landlords seeking to generate income from their investment. For this reason, correctly reporting rental income should be a fundamental part of this process, and something everyone should take into consideration. In this article, we’ll guide you through the most important aspects of reporting rental income, including legal requirements and the tax implications involved.

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Why do you need to report rental income from an apartment?

Remember that in Spain, it is a legal requirement to report rental income from an apartment or home. The Tax Agency, which is the regulatory body, can impose financial penalties if it discovers that you have earned rental income and have not reported it.

On the other hand, by filing a tax return, you gain access to various tax deductions and credits, which will significantly reduce the amount of money you ultimately owe the government. As a result, reporting rental income from an apartment will always result in financial benefits and peace of mind.

How do you report rental income from an apartment?

Using Form 100 from the Internal Revenue Service, you can file your annual income tax return. To do so, you must report all rental income you have earned. Here are the steps to follow:

Gather as much information as possible.

The goal is to gather information about tenants, rental income, and expenses incurred.

Decide which tax regime to apply

There are two options: the standard form and the simplified form. On the standard form, you'll find the options for deductions.

Fill out Form 100

On this form, you must list the income and expenses related to the rental.

File the return

You have the option of doing this through the Tax Agency's website.

Keep an eye on the filing deadline; keep in mind that the tax filing season begins in early April and ends in late June. Filing late will result in penalties.

What documents do I need?

You must gather the documentation supporting your income and expenses in order to properly file your rental income tax return. The following list will serve as a guide to help you collect the most relevant documents:

1. The lease agreement. This document sets forth the terms of the lease, the monthly rent, and the start and end dates of the lease, among other things.

2. Payment receipts. It is important to keep all receipts that document the tenants' monthly payments.

3.Utility bills. These refer to expenses for basic services, such as water, electricity, gas, home insurance, or condominium fees.

4. Bank statements. These show rent and expense payments.

5. Previous year's tax return. Have last year's tax return on hand.

6. Withholding tax certificate. If you withhold taxes from the tenant, you must have this document.

Remember that all of this documentation must be kept for at least four years, as the Tax Agency may request it in the event of an audit.

How do I report income from a shared apartment?

If you live in a shared apartment, you must report it using the same process as if the entire apartment were rented out, but with some differences depending on how income and expenses are divided; in other words, you must determine your share of the income and do the same for the expenses.

For example, if you rent out one or two rooms in a home, you must report the proportionate share you received of the total rent; you must do the same for the expenses incurred for the property. In this case, divide the expenses by the number of rooms or according to the agreement you have with your tenants. The key here is transparency and good communication among all parties involved.

What expenses can be deducted on your tax return?

As we mentioned earlier, reporting rental income from an apartment allows you to deduct expenses related to the property. Doing so lowers your taxable income and reduces the amount of tax you owe.

Below is a list of some of the most important deductible expenses:

Mortgage interest

If you took out a mortgage to purchase the property, the interest is tax-deductible.

Condominium fees

You can deduct the fees paid to the homeowners' association. This refers to common expenses, such as pool maintenance, elevators, cleaning, landscaping, and security.

Supplies

You can deduct these expenses if they are not paid by the tenant: water, electricity, and gas.

Insurance

Property insurance premiums are also tax-deductible.

Maintenance and Repair

If the apartment owner covers the costs of repairs, these expenses may be deducted. This includes electrical work, painting, renovations, plumbing repairs, tree trimming, and other similar expenses, provided that you have invoices to support the costs.

Tax consulting

You can claim a tax deduction for the fees paid to a professional who helps you file your tax return. This also includes fees paid to attorneys and legal advisors in the event of a lawsuit.

Depreciation of the property

You can deduct a percentage of the property's purchase price over time, which is typically 3%.

Paying taxes

r municipal fees and property taxes, such as the IBI, are also tax-deductible.

By knowing which expenses you can deduct, you can maximize your annual tax benefits.

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How much can be deducted for rent on 2024 income?

It is expected that for the 2024 tax return, deductions will continue to be capped at 60% of the income earned from renting out a primary residence. This percentage will vary depending on certain requirements met by the tenant, such as being under 35 years of age.

However, since the tax deduction for investment in a primary residence has been the subject of debate in recent years, and tax laws can change at any time, it is recommended that you consult official sources or tax advisors to stay up to date. 

Who is required to report rental income?

Given this uncertainty, it is important to know that all property owners who rent out a property must report the income received from that rental, regardless of the duration or type of lease agreement. In other words, if the property is part of your assets and you earn income from renting out an apartment or a room, this must be reported. If you are unsure, it is advisable to consult a tax advisor.

Where do you report rental income?

Rental income is reported on Form 100 of the Tax Agency as part of the annual Individual Income Tax (IRPF) return. This form includes a section for income from real estate, where you must report the income received and the deductible expenses related to your rental income.

We recommend filing this return online, as this method allows for immediate confirmation of the tax return and makes it easier to correct any errors.

What happens if I rent out my home and don't report it?

Failing to meet your tax obligations can have serious consequences, such as facing fines ranging from 50% to 150% of the unpaid amounts; in addition, you may be subject to more frequent audits. Furthermore, you would lose the opportunity to claim significant tax deductions. In short, failing to report your income can end up costing you much more than it would to comply with your obligations

What happens if I rent an apartment for a short time?

Even if you’re renting out an apartment for only a short period of time, it’s still important to report it, since any income generated from the rental is considered income from real estate.

However, in the case of short-term rentals, there is an exemption threshold. The tax agency has set a limit, and you may be exempt from filing a tax return if you do not exceed this limit. If you have any questions, it is advisable to consult a tax advisor. 

How does the IRS detect unreported rental income?

The methods and tools most commonly used by the Tax Agency to detect undeclared leases are as follows 

Data matching

The tax authorities compare the tax information provided by property owners with information from tenants. They can also cross-reference data with water and electricity utilities, municipal registries, and land registry records, among other sources. This helps identify discrepancies.

Complaints from third parties

The tax authorities often receive anonymous tips about unreported rental income.

Cash payments

Income that goes unreported and is paid in cash often raises suspicions and is subject to closer scrutiny.

Rental platforms

The use of digital platforms for renting properties (such as Airbnb or Booking) makes it easier for the Agency to access information about transactions that are not always reported.

The best practice is to act transparently and always fulfill your obligation to report your income. Whether you live off rental income or rent out your home, you are required to report it.

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Conclusion 

Registering a rental property is not only a legal requirement but also a process that will provide you with tax benefits and help you make the most of your financial resources, while also giving you peace of mind as a landlord. Always consult a professional if you have any questions, and remember that complying with these requirements contributes to a healthier and more regulated rental market.

Sergio Navarro

Expert in blockchain, investments, and personal finance

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