🤖 AI and Taxation: How Tax Agency’s algorithms analyse your company in 2026

Digital transformation hasn’t just reached offices and businesses; the Spanish Tax Agency has completed the implementation of AI-based risk profiling systems in 2016. Today, the selection of taxpayers for audits is no longer random, but rather the result of algorithms that cross-reference millions of data points in milliseconds. At Ruiz & Associates, we understand that the best defense against a technologically advanced administration is impeccable and proactive accounting management.

What does the AEAT’s algorithm analyze?

The Spanish Tax Agency’s system no longer simply checks that the VAT “balances”. Its machine learning algorithms look for patterns of behavior that deviate from the norm in three critical areas:

  1. Sector deviation: The system compares your profit margins and expenses with the average for your sector and geographic area. A significant deviation, without a clear justification in the financial statements, is an automatic “red flag”.
  2. Cash flow inconsistencies: Thanks to the maturity of systems such as Verifactu, the Tax Agency analyzes the relationship between its declared income and bank movements almost instantaneously.
  3. Relationship networks: The algorithm tracks linked transactions and relationships with suppliers to detect structures that may be classified as simulation or lack of economic substance.

From “data” to “explanation”: The value of the advisor

The biggest risk of algorithmic auditing is decontextualization. An algorithm can detect an anomaly, but it doesn’t know the reality of your business: a strategic investment, a change in model, or a specific crisis with a supplier.

This is where Ruiz & Associates‘ work becomes crucial. Our methodology isn’t just about registering invoices on platforms like ContaSol or Holded; it’s about technical oversight. We ensure your accounting tells a coherent and legal story, preparing the supporting documentation even before the algorithm raises an alert.

The importance of real-time accounting

Waiting until the end of the year to “fix” the accounts is an outdated and dangerous strategy in 2026. The tax authorities analyze quarterly and even monthly data. Therefore, digitizing accounting processes is your best defense. Working with tools that provide a clear view of the company’s financial status allows us to run risk simulations similar to those performed by the Spanish Tax Agency (AEAT), correcting discrepancies before they become formal demands for payment.

Legal certainty in the face of automation

In this scenario, the right to a defense begins the moment an invoice is issued. Tax compliance is the only way to guarantee peace of mind for the administrator. The tax authorities’ technology is relentless, but it is also predictable with the right advice.

Professionalism versus technological control

At Ruiz & Associates, we have been adapting to legislative and technological changes for over 30 years. The Spanish Tax Agency’s AI presents a challenge, but also an opportunity for companies committed to transparency and rigor. It’s not about fearing the algorithm, but about being so well prepared that its analysis only confirms the soundness of your management practices.

Do you know what image your company projects to tax authorities? At Ruiz & Associates, we conduct preventative audits to ensure your risk profile is appropriate. Contact us today and secure your business’s peace of mind.

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