Greece is rolling out a significant real estate reform with the introduction of the Property Ownership and Management Registry (MIDA), expected to launch within the first quarter of the year. Developed by the Independent Authority for Public Revenue (AADE), this platform will create the country's first unified digital database for property information, and the property owners will need to review and verify their records once it launches.
What is MIDA?
Established under Article 217 of Law 5222/2025, MIDA will consolidate all key property data into a single digital environment, including property type, surface, location, floor level, electricity supply, construction status, and declared use.
A major feature of the new system is the synchronisation of the Property Identity Number (ATAK) with the National Cadastre Code Number (KAEK). This alignment between tax records and cadastral data is designed to reduce discrepancies and create a reliable reference point for both authorities and property owners. Full integration with the Unified Property Registry (EMA) under the Hellenic Cadastre will follow once EMA becomes fully operational.
New declaration requirements for owners
Under MIDA, property owners must declare the specific use of each property they own. Required disclosures include:
Residential or business use: Whether the property is a primary or secondary residence,
Rental information: Properties under long-term or short-term lease, financial leasing contracts or use free of charge.
Enhanced oversight through cross-referencing
MIDA will enable automated cross-checks across public and private databases to improve compliance:
Vacant properties will be verified against electricity consumption data to confirm accurate reporting.
Rental income will be cross-matched with tenant information to identify discrepancies.
Free-use declarations will be reviewed to detect potential undeclared income.
At a later stage, tenants will also access the platform to confirm rental information, helping authorities identify undeclared rental income. AADE has already stepped-up audits on under-reported leases. Where inconsistencies are found, the system may trigger tax audits and penalties.
What property owners have to do
Property owners should be prepared to verify their records once MIDA launches by ensuring consistency between tax authority records and Cadastre entries, aligning ATAK and KAEK information, and correcting any discrepancies. Further ministerial decisions are expected to clarify technical procedures, interoperability requirements, and data protection rules.