Privacy policy
Last updated: 27 September 2026
This policy explains what data miDeclaro processes, why, where it is stored, and what rights you have over it.
⚠️ Technical draft. This text accurately describes how the system works, but it has not yet been reviewed by a lawyer. It should not be treated as final until it has been.
Data controller
miDeclaro. For any question about your data, write to privacidad@mideclaro.com and the person responsible for privacy will reply.
What we process
Identity: name, NIE or NIF, country of tax residence. Tax data: the type and amount of your Spanish-source income, property details (address, cadastral reference and value, dates, ownership share), and any tax withheld. Documents you upload: nota simple, IBI receipt, deed, bank certificates. Your conversation with the assistant, so a half-finished declaration can be resumed and for quality control. If you answer by voice, the recording is sent to the artificial-intelligence model, in the European Union, only to transcribe it and propose the answer; it is not stored anywhere, and the answer does not count until you confirm it. If the app fails, a technical report of the error is recorded (the message, the screen and the version), without your data. We count visits to this website without cookies or identifiers: only the page viewed, the language and the kind of place the visit came from (a search engine, a social network…), added up per day. We do not keep your IP or anything that could recognise you, and nothing is counted if your browser asks not to be tracked.
What we use it for
Solely to calculate your non-resident income tax and prepare your Modelo 210 filing pack: the exact values to enter on the Agencia Tributaria's predeclaración form, what to attach, the deadline, and how to pay or claim a refund. Also to keep that pack in your archive, and for the human review of cases the calculation engine flags. miDeclaro does not file anything on your behalf and does not generate forms that belong to other people, such as the buyer's Modelo 211, which we only read in order to credit the withholding. We do not sell your data or pass it to third parties for commercial purposes.
Legal basis
Performance of the contract you enter by using the service (art. 6(1)(b) GDPR). Subsequent retention rests on a legal obligation (art. 6(1)(c) GDPR).
Where it is stored
All data is processed and stored inside the European Union. The database is in the European multi-region (Belgium and the Netherlands) and processing runs in Belgium. AI analysis also runs inside the European Union. No data is transferred outside the European Economic Area.
How long we keep it
Filed declarations are kept for five years from filing. Article 66 of the Spanish General Tax Law sets a four-year limitation period during which the tax authority may review them, counted from the end of the filing window; five years covers that period in full. Conversations that never result in a filed declaration are deleted after twelve months.
Your rights
You may request access, rectification, erasure, portability, restriction or objection by writing to privacidad@mideclaro.com. Erasure does not extend to declarations already filed for as long as the legal retention obligation lasts. You may also complain to the Spanish Data Protection Agency (aepd.es).
Contact
Privacy and data protection, miDeclaro: privacidad@mideclaro.com