"Do we have to switch to e-Defter (Türkiye's electronic ledger), and if so, by when do we have to submit it each month?" This question is on the agenda of many finance teams, especially since the scope widened in 2025. The answer has two parts: who is required to use it, and on what calendar the monthly ledgers are submitted for approval.
In this article we summarize the topic from the current text on edefter.gov.tr of the Electronic Ledger General Communiqué Serial No. 1 (1 Sıra No.lu Elektronik Defter Genel Tebliği), published jointly by Gelir İdaresi Başkanlığı (GİB, the Turkish Revenue Administration) and Ticaret Bakanlığı (the Ministry of Trade), and then look at how the month-end closing calendar can be automated. The invoice side is covered in the e-Fatura (e-Invoice) article and the dispatch note in the e-İrsaliye (electronic dispatch note) article; here the subject is only the statutory ledgers.
What is e-Defter?
According to section 3.1.1 of the communiqué, e-Defter is the set of electronic records covering the information in the books that must be kept under the Tax Procedure Law (Vergi Usul Kanunu, VUK) and the Turkish Commercial Code (Türk Ticaret Kanunu). The ledger files are created without being printed on paper; their immutability, integrity and origin are secured by an electronic signature or a mali mühür (financial seal).
At the heart of the process is the berat (approval certificate). According to section 4.3.3, obtaining the berat for the first month of the accounting period counts as the opening approval, obtaining the berat for the last month counts as the closing approval, and the berats for the other months take the place of notary approval for the ledgers of those months. Section 4.3.10 states that e-Defters stored together with their berats approved by GİB are considered valid statutory ledgers.
Is e-Defter mandatory, and for whom?
Section 3.2.1 of the communiqué lists the scope of the obligation in three groups:
- Taxpayers required to switch to the e-Fatura application. The scope of e-Fatura is regulated in VUK General Communiqué Serial No. 509.
- Companies subject to independent audit under Article 397 of the Turkish Commercial Code.
- Those required to keep books on a balance-sheet basis, as well as those who voluntarily opt for the balance-sheet basis. This item was added by Communiqué Serial No. 5 and entered into force on January 1, 2025.
Communiqué Serial No. 6 added a clarification to this item: economic enterprises of associations and foundations that keep books under VUK Articles 172 and 173, and do so on a balance-sheet basis, are also within scope. Taxpayers with no obligation to keep books, such as associations, foundations, trade unions and chambers, cooperatives exempt from corporate tax, and taxpayers in bankruptcy, are outside the obligation.
The timing of the switch is regulated in section 3.2.6. For example, those who keep books on a balance-sheet basis must keep an e-Defter from January 1, 2025, while those who start business after that date, change class or lose their exemption must do so from the date they start business, change class or leave exempt status. In addition, section 3.2.2 gives GİB the authority to bring taxpayers it finds risky or low in compliance into scope, with written notice and a preparation period of at least three months.
For those who are required but have not switched, the rule is harsh: according to section 3.2.10, GİB opens the e-Defter account ex officio (re'sen), and the ledgers these taxpayers keep on paper are treated as never having been kept. The inventory ledger (envanter defteri) can, for now, be kept as an e-Defter on a voluntary basis; GİB has the authority to make this mandatory. Because the scope rules can change, also check GİB's e-Defter announcements.
When is e-Defter submitted? Berat upload deadlines
Section 4.3.4 of the communiqué sets two rules for monthly e-Defter and berat files:
- Ordinary months: for income taxpayers, by the end of the 10th day of the fourth month following the month concerned; for other taxpayers, by the end of the 14th day of that same fourth month.
- The last month of the accounting period: for income taxpayers, by the end of the 10th day of the month following the month in which the income tax return is to be filed; for other taxpayers, by the end of the 14th day of the month following the month in which the corporate tax return is to be filed.
Within this period, the ledger and berat files must be created, signed with a time stamp using a NES (qualified electronic certificate) or a mali mühür, and uploaded to the e-Defter application, and the berat approved by GİB must be obtained.
The same section recognizes one more option: taxpayers who wish to may declare a preference in the first month of each accounting period and upload the berats on a provisional tax period basis (each month separately). GİB's announcement dated January 20, 2026 states that those who do not declare their preference in time will be deemed to have chosen "Aylık Yükleme" (Monthly Upload).
Three further points are important. First, according to section 4.3.8, these are maximum periods; they do not affect the return and payment deadlines, and earlier upload is possible. Second, section 4.3.6 gives GİB the authority to extend the deadlines by up to one month; for example, Circular No. VUK-202/2026-8 extended the deadlines falling due in June 2026 to June 30, 2026. Third, according to section 6.8, the penal provisions of the VUK apply if files are not uploaded on time or are uploaded late. We recommend verifying your own calendar with your certified public accountant (mali müşavir).
Automating the closing calendar
Section 4.3.8 states that the time allowed covers not only the upload but also the format check, verification that all accounting records are included in the ledger file, and creating and signing the berat. In other words, the deadline is for the entire month-end close. The main recommendations for tying this process to a calendar and to controls are:
- Generate deadlines from the rule. If the taxpayer's status (income tax or corporate tax), the accounting period and the upload preference (monthly or provisional tax period) are kept as parameters in the system, each month's deadline can be derived from the rule instead of being calculated by hand. A step that monitors GİB's deadline extensions and updates the calendar should also be added to this flow.
- Link the closing checklist to the workflow. Steps such as reconciliations, depreciation, exchange-rate differences and accrual entries can be opened as tasks with an owner and a date; open steps approaching the deadline generate alerts. The closing module of the ERP system should be the single source here.
- Run the pre-check before uploading. Checks such as format errors, consistency between the journal (yevmiye) and the general ledger (büyük defter), or missing entries can be run on a rule basis. These recurring checks are good candidates for automation with RPA.
- Make retention part of the process too. According to section 4.4.1, e-Defter and berat files must be stored linked to one another in the taxpayer's own information systems; copies must be kept for at least 10 years with an authorized private integrator or in GİB's systems. Downloading and archiving the approved berat should also be on the checklist.
- Define authority clearly. Section 4.3.7 allows signing and uploading to be carried out, by power of attorney or letter of consent, by a private integrator, a compatible software company or a member of the accounting profession; however, responsibility remains with the taxpayer. Who will sign which period should be set out in writing.
Which automations pay back first on the finance side is covered in the article on automation in finance processes.
Frequently asked questions
Is a time stamp mandatory for e-Defter? Section 4.3.4 of the communiqué requires e-Defter and berat files to be signed or approved with a time stamp using a NES or a mali mühür.
In which month must e-Defter be submitted? In ordinary months, by the end of the 10th (income taxpayers) or the 14th (other taxpayers) of the fourth month following the month concerned. For the last month of the accounting period, the deadline depends on the month following the one in which the annual return is to be filed. The deadlines differ for those who have opted for the provisional tax period basis.
Does berat approval mean the ledgers have been audited? No. According to section 4.3.11, berat approval does not mean an audit of the content or accuracy of the entries in the ledger, or a tax examination.
Can paper ledgers still be kept after switching to e-Defter? No. According to section 4.3.1, from the month in which a taxpayer must be included in the application, ledgers cannot be kept on paper; if they are, they are treated as never having been kept.
Conclusion
Since 2025, e-Defter has also covered taxpayers required to keep books on a balance-sheet basis, and every month has a deadline set by the communiqué. That date is not just an upload day; it is the moment by which the month-end close must be finished. Generating the calendar from the rule, running the checks before the upload and tying retention into the same flow make this workload predictable. Because rules and deadlines can change, it is necessary to follow GİB announcements and to verify your obligations with your certified public accountant.
Why logistics experience matters in the month-end close. In a business that moves goods, much of what the ledgers must reflect starts on the warehouse floor and in the transport system rather than in accounting: goods receipts, stock movements, returns, dispatch notes (e-İrsaliye) and freight costs. The month-end close therefore depends on operations posting these transactions on time, and an agreed daily cut-off helps finance close on schedule. The five recommendations above will look familiar to anyone who has run a distribution network: dates derived from rules rather than counted by hand, a checklist with an owner and a due date for every step, a quality check before the truck leaves (here, before the upload), a record that follows the goods (here, ledger and berat files kept linked) and written authority for who signs. One of Orient Global's consultants brings more than 30 years in operations, logistics and supply chain: at a technology distribution company of roughly one billion dollars in scale, he ran logistics, warehousing, technical service and administrative operations end to end, building and leading teams of 100+ people and delivering lasting gains in operational performance through KPI-driven programs. He has also managed nationwide warehouse and transport operations across leading retail, logistics and distribution organizations. An industrial engineer, he now brings that supply-chain discipline to SMEs through AI and automation. Meet our consultants.
This article is for general information only and does not constitute legal or financial advice. Consult your own specialist about your situation.
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