Tax Agency Tightens Control Over Cryptocurrency, Rental Income, and Online Sales in Spain
Millions of taxpayers in Spain who have carried out transactions on digital platforms, earned rental income, or invested in cryptocurrencies will receive official notifications, according to Información.es. These messages are being sent as part of the 2026 income tax filing campaign and are currently preventive in nature: they highlight possible errors in tax declarations. However, they also clearly signal a strengthening of the tax authority’s oversight in these areas.
A New Approach in Spain’s Tax System: Preventive Control
The 2026 income tax filing campaign in Spain is marked by a significant shift in the approach of the tax authorities. Agencia Tributaria has begun sending millions of preventive notices to individuals who have used platforms such as Wallapop, hold cryptocurrencies, or receive rental income.
The main purpose of these messages is not to impose sanctions. Instead, the tax authority informs taxpayers in advance that it already has access to relevant transaction data, aiming to reduce errors in tax returns.
These notifications may appear at different stages — when reviewing preliminary tax data, while filing through the Renta Web system, or even after submission if discrepancies are detected.
The total number of such notices is expected to exceed 3.5 million. They are part of a preventive control strategy: taxpayers are first alerted to possible inconsistencies, and only afterwards, if necessary, formal audits or procedures may follow.
Where Spain’s Tax Authority Gets Digital Transaction Data
The increase in notifications is driven by the expansion of data sources. The control system integrates information from digital platforms, banks, and international tax information exchanges.
Key sources include resale platforms such as Wallapop and Vinted, which are required to report seller data under the EU DAC7 directive. Banks report significant financial transactions, while cryptocurrency-related data is shared through international information exchange mechanisms. Regional property registries related to rental activity also contribute to the overall dataset.
As a result, the tax authority can build a more detailed and comprehensive profile of taxpayer income than before.
Which Transactions Attract Tax Authority Attention in Spain
Sales through digital platforms such as Wallapop are taxable only if they generate a profit. If an item is sold below its original purchase price, no tax obligation arises.
Rental income from real estate must be declared as capital income.
Cryptocurrency transactions require reporting all sales, exchanges, and profits, even if funds are not withdrawn to a bank account. This segment is considered one of the most complex and is a frequent source of reporting errors.
Cryptocurrency Taxation in Spain
In 2026, cryptocurrencies in Spain are treated as an investment asset. Taxable events include selling crypto for euros, exchanging one cryptocurrency for another, and using digital assets to pay for goods and services. Gains are taxed as capital income under a progressive scale:
19% — up to €6,000
21% — €6,001 to €50,000
23% — €50,001 to €200,000
27% — €200,001 to €300,000
28% — above €300,000
Certain types of income, including mining or large recurring earnings, may be classified as general income and taxed at rates of up to 47%, depending on the overall tax base.
Tax reporting is carried out through the annual IRPF declaration using Form Modelo 100, which covers all income and capital gains. For assets held on foreign platforms, Form Modelo 721 is required if holdings exceed €50,000. The deadline for the main tax return is June 30, 2026, while foreign asset reporting is due by March 31.
Restrictions on the Rental Housing Market in Spain
Spain is tightening regulation of short-term rental housing. In Valencia, strict quotas have been introduced: tourist rentals are limited to 2% of the total housing stock per district. Total tourist accommodation — including hotels and apartments — must not exceed 8% of registered residents per area. An additional restriction limits short-term rental use to no more than 15% of ground-floor properties.
In Barcelona, around 10,000 tourist rental licenses are expected to be revoked by 2028. Málaga has introduced a three-year moratorium on new short-term rental licenses. In Seville, authorities are enforcing compliance measures against illegal rentals, including cutting utility services.
In Catalonia and the Balearic Islands, fines for illegal rentals range from €40,000 to €600,000. In addition, Spain has introduced a national short-term rental registry, where a significant share of applications has been rejected, reducing the number of legal properties on the market.
The Logic of Spain’s New Control System
Analysts at International Investment note that recent changes in Spain’s tax and rental regulation reflect a broader trend toward digital, pre-emptive control of income and assets. The state increasingly relies on automated data exchange between banks, platforms, registries, and international systems, reducing the space for undeclared activity.
In taxation, this results in broader data collection and earlier detection of discrepancies in income from online platforms, rentals, and cryptocurrencies. At the same time, reporting requirements are becoming more formalized, and tax declarations are increasingly based on data already held by authorities.
In the housing sector, a parallel shift is taking place: tighter restrictions on short-term rentals and a gradual reallocation of housing toward long-term residential use. Quotas, licensing freezes, fines, and the national registry are steadily reducing the share of the tourist rental market.
Taken together, these measures point to a more regulated environment for both digital income and real estate investment — a trend investors will need to factor into future strategies.