Greece has opened its online platform for winter heating allowance applications for 2026 to 2027, introducing new mandatory rules for apartment buildings.
Building managers and property management firms must create a dedicated digital profile for each apartment block on the myThermansi platform before individual residents can apply for state fuel support.
Residents face a firm deadline of Friday, 4 December 2026, to file their subsidy applications. The tax administration plans to distribute advance payments before Christmas, with transfers scheduled to reach bank accounts by 23 December 2026.
The Independent Authority for Public Revenue, known as AADE, issued ten operational rules to help property managers, flat owners and tenants prevent administrative mistakes that could forfeit their heating payments. AADE confirmed that this extra registration step is mandatory for all residential buildings heated by oil.
The heating allowance is an annual Greek state welfare subsidy designed to ease winter energy costs for lower and middle income households. In Greek cities, most urban residents live in residential blocks known as polykatoikies, which traditionally rely on shared central heating systems. Heating expenses in these buildings are divided according to milliemes, a legal formula that splits shared property obligations into one thousand proportional shares based on floor area and heat consumption.
Mandatory profile details for apartment blocks
Under the instructions released by AADE, building administrators or management companies must log into myThermansi to register five essential pieces of information for their property.
The administrator must declare their personal Tax Identification Number, known in Greece as an AFM, or provide the AFM of the licensed property management firm representing the building. If the apartment building has secured its own dedicated tax number, that building AFM must also be recorded.
Managers must also submit the communal electricity supply meter number linked to the shared areas of the block, the exact millieme participation share assigned to each apartment, and the full names of all individuals living in residential flats that are not used as business premises.
The revenue authority stressed that purchase documents for heating oil must align precisely with official records. Both the tax identification number and the shared electricity meter number printed on oil delivery receipts must match the records stored in the platform database for heating milliemes management.
Rules for buildings without managers or meters
Many apartment buildings in Greece lack a formal administrator or an active commercial property management firm. In those situations, AADE stated that residents and property owners must convene and agree on an individual to take on the role of manager so they can create the building profile on the platform.
A similar rule applies to buildings that do not possess a dedicated communal electricity meter for shared spaces. When a building has no common meter, all flat owners and tenants must mutually agree on which resident will lend their personal electricity meter number to serve as the shared supply on the system.
In most cases, the designated building representative or the acting administrator provides their own electricity meter number. Without this agreed entry, the digital system cannot establish the property profile, and no flat in the building will be able to claim the subsidy.
Building tax numbers and manager changes
Where an apartment building has obtained its own distinct AFM from the tax service, all invoices and receipts for heating oil deliveries must be issued directly to that building tax number. The administrator must link the number to the online file by selecting the designated link to set the building tax number on the platform.
Even when a building tax number is active, individual tenant applications will continue to display the personal AFM of the building manager or representative. The revenue authority advised residents that this is standard procedure and does not affect individual eligibility.
Special procedures apply whenever an apartment block appoints a new manager during the heating season. An incoming administrator cannot simply take over an existing online profile; they must establish a fresh building profile under their own tax number and activate its payment facility. Residents must then lodge their subsidy applications under the new profile.
AADE warned that timing is critical if an administrator change takes place after the application deadline of 4 December 2026. If the manager changes after that date, all subsequent heating oil purchases made up to 31 March 2027 must remain registered under the AFM of the previous administrator, or automated database cross checks will fail.
Profile edits and tenant records
Building administrators retain the ability to update, correct or adjust any building details on the platform up until the moment they confirm the activation of payments. Once payment activation is finalized, the portal locks all property details, and no further modifications can be submitted.
The tax authority clarified that resident names listed in building records are purely indicative and will not derail a tenant claim. If the digital portal shows the name of a previous occupant, the manager needs only to inform the new resident of their correct apartment number, which the tenant can select even if the screen shows the former resident.
Independent burners and key deadlines
The regulations establish separate requirements for flats with independent heating units. In apartment blocks where individual flats have their own dedicated boilers or burners, occupants cannot apply through a shared building profile.
Each resident with an independent burner must instead apply for the heating subsidy as the occupant of a detached home. Those households must purchase their heating fuel privately and secure separate purchase invoices made out in their own name.
The opening of myThermansi on Tuesday, 10 November 2026, gives Greek households less than four weeks to coordinate building details and register their claims. Once the application window closes on Friday, 4 December 2026, the tax authority will process advance payments due by 23 December 2026, with fuel transactions eligible for validation through 31 March 2027.
