1. You must keep a single-entry accounting system (income-expense book) which includes all types of:

• Income separated in income from the sale of goods, from the sale of products, from service provision and other income
• Profits
• Purchases of assets, purchases of goods, materials (raw and auxiliary materials), fixed and purchases of other assets
• Expenses separated into personnel fees including contributions to social security organizations, depreciations, expenses from the procurement of other services and other expenses
• Losses
• Taxes and charges, separated by kind.

2. You must update the income-expense book for every calendar trimester, at the latest by the end of the month following the end of the trimester.

Additionally:

You may keep and safeguard more files as required, like a fixed asset, inventory file etc.

ΝΟΤΕ

You must safeguard all accounting records (books and records) for a period of five (5) years from the end of the period or the time determined by other legislation if it is longer than five (5) years, in any form if there exists a system for search, appearance and printing or reproduction to facilitate any audit.