Greece Sets 30% Deviation Cap for Pre-Filled
Income Tax Returns 

The Greek tax authorities have published Decision 1045/2025, implementing key regulations under the Greek Tax Procedure Code, focusing on pre-filled income tax returns (Form E3) und myDATA platform integration.

Key Changes & Requirements 

🔸 New 30% Deviation Limit for Form E3 

• Starting with the 2024 tax year, taxpayers may only modify pre-filled income and expense data within a 30% deviation cap from the values submitted to the myDATA platform. 
• This applies to the Statement of Financial Data from Business Activity (Form E3). 

🔸 Pre-Filled Returns Now the Norm 

• Since the 2023 tax year, Form E3 has been automatically populated using myDATA. 
• From 2024 onward, manual adjustments are limited by the new deviation threshold. 

🔸 Additional Regulatory Requirements 

• Clear rules for classifying income and expenses. 
• Mandatory reconciliation between taxpayer-reported figures and myDATA records. 
• Defined processes for correcting discrepancies in pre-filled values. 

🔸 Scope of Application 

• Applies to all entities subject to myDATA that are required to submit Form E3. 
• Mandatory for all income tax returns for the 2024 tax year and beyond. 

2. VAT Returns: Alignment Trend Continues 

Background on Pre-Filled VAT Returns 

• Since 2022, VAT returns have been pre-filled based on myDATA inputs. 
• Initially, deviation thresholds existed for discrepancies. 

VAT Deviation Limits Abolished 

• As of 1. Januar 2025, all deviation limits for VAT returns have been eliminated. 
• Taxpayers must now ensure full alignment with myDATA-reported income and expenses per tax period.  

3. What to Expect 

The 30% deviation limit for Form E3 may be gradually reduced in the future, mirroring the path taken for VAT returns. This signals a continued shift toward real-time, platform-aligned reporting and highlights the growing importance of accurate and timely submissions to myDATA. 

4. Action Points for Businesses 
5. Review internal systems to ensure consistency between ERP/accounting data and myDATA submissions. 
6. Establish controls and audit mechanisms for pre-filled tax return validation. 
7. Monitor further updates from AADE regarding deviation limits and compliance procedures.