Greek taxpayers face tighter deadlines for updating their property declarations (E9) due to upcoming changes in property tax (ENFIA) payment schedules, which will begin in 2025. Taxpayers must finalize any adjustments by January 31, 2025, to avoid penalties. New declarations are essential for those who acquire property in 2024, while corrections can also be made retroactively. Important factors influencing tax liabilities include property type, floor number, and property rights. Failure to properly declare can lead to significant tax increases.