According to sources, the implementation of the Property Ownership and Management Registry (MIDA) has been put on ice, as the Greek tax authority’s (AADE) ambitious new digital initiative — designed to bring order to the fragmented landscape of real estate ownership by consolidating property ownership, usage, and management data into a single unified platform for the first time — continues to stumble over serious technical and operational hurdles.
According to informed sources, this latest setback is pushing the timeline back once again, with the full activation of MIDA now expected to take place after the upcoming elections. The decision is understood to be a political one: the Ministry of National Economy and Finance and the broader government are unwilling to open a new front of disruption for more than 7 million property owners during the pre-election period — owners who would be required to review and, where necessary, correct their property records.
Real estate: The plan for MIDA
The immediate priority is to resolve the outstanding technical issues and reduce the discrepancies between the various databases before the system moves into full operational mode. If officially confirmed, the decision aims to prevent a mass wave of citizens seeking assistance because their property records appear differently across public databases — with all the implications that could have for the accuracy of their tax declarations and the functioning of government services. This latest delay follows a series of successive postponements. MIDA had originally been designed to go live in the first quarter of 2026, with its activation later pushed to June and then to July. Subsequently, the plan envisaged a phased rollout beginning in August, with the first phase to be completed by October.
Yet another postponement of full implementation
However, problems that emerged in the interconnection of information systems and in data matching made it impossible to meet even that revised schedule, resulting in yet another postponement of full implementation.
MIDA is essentially a unified digital file for each individual property — whether a primary residence, vacation home, commercial space, plot of land, or agricultural field. Each file records the property’s use, square footage, electricity and water connections, tenant information where a lease exists, as well as any pending legal or urban planning issues. The data is drawn from sources including the E9 tax form, the Hellenic Cadastre, the electricity grid operator DEDDIE, water utility companies, the myPROPERTY platform, mortgage registries, and other public databases.
What will play a central role
A key function of the new system is the matching of two critical property codes: the KAEK, assigned by the Hellenic Cadastre, and the ATAK, issued by AADE. Through this matching process, each property acquires a unique digital identity, enabling the automatic detection of discrepancies in surface area and usage. This makes it possible to identify properties that appear vacant yet consume electricity, are declared as rent-free yet generate income, or have different square footage recorded across different registries.
Particular emphasis is placed on rental properties. The system will indicate whether a property is rented, vacant, or provided rent-free, while simultaneously cross-referencing declared rental income against utility consumption and banking data. Rental income will appear pre-filled in the E2 tax form and will be automatically transferred to the E1 return, significantly curbing the phenomenon of undeclared rental income.
Recording vacant properties
In this way, vacant properties will be formally catalogued for the first time, allowing the competent authorities to gain a clear picture of the real stock of properties that remain off the market. At the same time, tenants will be able to review the details declared by their landlord and report any discrepancies, in cases where the actual rent differs from the amount officially declared. It should be noted that the mandatory payment of rent through the banking system had been scheduled to begin on 1 October 2026. However, MIDA’s delay now creates a significant practical problem, as the new system requires the necessary infrastructure to record and cross-reference lease and bank account data — resulting in the measure being pushed back to 1 July 2027.
Who would have been prioritised initially
MIDA was not designed to be implemented across all property types simultaneously, but rather in stages, with the first phase focusing on agricultural land. Initial priority was to be given to the owners and beneficiaries of agricultural plots, as the need to verify and cross-reference land rights against Cadastre records and tax authority declarations is particularly acute in that sector — ensuring that subsidies are directed to their rightful recipients. The remaining property categories — including residential properties, building plots, commercial spaces, and leased properties — were to follow in subsequent phases.
Real estate: Where MIDA got stuck
The biggest stumbling block for MIDA lies in the challenge of linking databases that were built using different rules and different identifiers. At the heart of the problem is the matching of the 11-digit ATAK code, through which AADE identifies a property, with the 12-digit KAEK code used by the Hellenic Cadastre. This matching process is not always automatic, as the same property may appear with different surface areas, ownership rights, usage classifications, or even different descriptions across the two databases. The problem becomes even more complex in cases involving co-ownership, property transfers, inheritances, and old records that have not been updated.
The task becomes even more challenging when it comes to leased agricultural land. MIDA must be capable of cross-referencing agricultural plot data with OSDE declarations and rural subsidy records. However, matching agricultural parcels with Cadastre data is a particularly complex undertaking, substantially increasing the volume of information that must be verified and reconciled.
The second critical challenge
A second major challenge involves linking MIDA with the electricity grid operator DEDDIE, as the system must match property ownership data with each property’s electricity supply and power connection records. Here too, discrepancies arise that require additional checks and corrections. Properties with differing square footage, changes in usage, interruptions or alterations to electricity supply, and cases where the current status is not recorded consistently across all databases all create additional difficulties for automated identification. Before MIDA can be rolled out on a mass scale, it must be ensured that the data held by the various agencies aligns seamlessly, without generating erroneous entries or incorrect flags.
The rental property challenge
A further sticking point concerns rental properties, as MIDA must integrate and cross-reference data from electronic lease agreements with the actual status of properties. The objective here is to establish clearly who is recorded as the owner, who is the tenant, which property the lease relates to, what its characteristics are, and what rental amount has been declared. The discrepancies that currently exist — whether due to outdated or incomplete declarations, or to changes that have not been simultaneously updated across all databases — risk generating a fresh wave of audits and correction requests. This is one of the key issues that AADE wants to have fully resolved before the system is opened up on a large scale. When that moment arrives, MIDA is expected to become one of the most powerful tools available to the tax administration, enabling the state to access consolidated property data for more than 7 million property owners in a single, unified view.
