Legal obligations after incorporation in Turkey include tax registration, social security setup, corporate books, e-notification, annual general assembly procedures, independent audit compliance, and foreign-investment reporting. This guide explains the key post-incorporation duties for Turkish companies.
Introduction
In Turkey, incorporation is not the end of the legal process. It is the point at which a company becomes a legal person and immediately enters a dense compliance framework involving the trade registry, tax administration, social security system, commercial books, corporate governance rules, and, in some cases, foreign-investment and labour-law filings. Official Invest in Türkiye guidance states that company formation is carried out through Trade Registry Directorates and MERSIS, but it also makes clear that once registration is completed, the Trade Registry Directorate notifies the tax office and the Social Security Institution and the company must proceed with further post-registration steps. (Türkiye Invest)
That distinction matters because many founders assume that once the company is registered and the trade-registry record exists, the hard part is over. In practice, many of the most important legal risks arise after incorporation: failure to activate the tax position correctly, failure to obtain or monitor e-Notification, failure to open and maintain the correct commercial books, failure to hold the annual general assembly on time, failure to register foreign-investment information electronically, or failure to obtain work authorization for foreign personnel. Turkish law treats these as real compliance duties, not optional housekeeping. (Türkiye Invest)
For foreign investors, the framework is broadly accessible but not lighter. Official Invest in Türkiye guidance states that international investors have the same rights and liabilities as local investors and may establish the same company types under the Turkish Commercial Code. That means a foreign-owned Turkish company usually follows the same post-incorporation rules as a locally owned one, while also carrying some additional reporting and immigration-related obligations. (Türkiye Invest)
This article explains the legal obligations after incorporation in Turkey in a practical sequence. It focuses on what a newly incorporated company must do immediately, what must continue during the first financial year, and which obligations become especially important if the company has foreign shareholders, intends to employ staff, or grows into the independent-audit perimeter. (Türkiye Invest)
1. Registration Creates the Company, but Also Triggers Immediate Duties
Under Turkish company law, registration before the trade registry is the act that gives the company legal existence, but registration also starts a chain of mandatory follow-up obligations. Official Invest in Türkiye guidance states that after the registration phase is completed, the Trade Registry Directorate notifies the relevant tax office and the Social Security Institution ex officio and arranges publication in the Commercial Registry Gazette. The same source states that a tax registration certificate must be obtained from the local tax office and that the company must obtain a social security number from the relevant Social Security Institution. (Türkiye Invest)
So the first legal mistake to avoid is thinking of trade-registry registration as a self-sufficient endpoint. In Turkey, registration is better understood as the moment when the company becomes visible to multiple authorities at once. From that day onward, the company is expected to behave as a taxpayer, a corporate record-keeper, a potential employer, and a company subject to ordinary corporate-governance rules. (Türkiye Invest)
2. Tax Registration and Tax-Office Follow-Up
One of the first legal obligations after incorporation is proper tax-office follow-up. GİB’s official guidance states that, for corporate income taxpayers such as joint stock companies, limited companies, and partnerships limited by shares, once the registration is completed at the Trade Registry Directorate, the registration data is transmitted electronically to the relevant tax-office systems and the tax registration is opened accordingly. For these corporate taxpayers, a separate start-of-business notification is therefore not required in the ordinary way. (ivd.gib.gov.tr)
But that does not mean the company can ignore the tax office. Official Invest in Türkiye guidance states that a tax registration certificate must be obtained soon after the Trade Registry Directorate notifies the local tax office. It also states that a tax officer comes to the company headquarters to prepare a determination report and that at least one authorized signature must appear in that report. GİB’s official guidance adds that start-of-business inspections through the electronic inspection system are generally performed within fifteen days from the date the tax registration is opened. (Türkiye Invest)
The practical lesson is simple: after incorporation, the company should be ready to show that the registered address is real, that its signatory structure is operational, and that the business exists where it says it exists. A company that is formally incorporated but not ready for tax-office verification can create avoidable delay in its first real compliance stage. (Türkiye Invest)
3. Corporate Tax, VAT, and the Ongoing Tax Framework
After incorporation, the company is drawn into Turkey’s general tax system. Official Invest in Türkiye’s tax guide states that Turkish taxation is organized under three main headings: taxes on income, taxes on expenditure, and taxes on wealth. It identifies corporate income tax as one of the main income taxes and explains that VAT generally applies to taxable supplies of goods and services, imports, and other listed transactions. (Türkiye Invest)
This matters because many founders think of tax compliance only in terms of annual corporate tax. In practice, a newly incorporated Turkish company may need to monitor corporate tax, VAT, withholding obligations, payroll-related filings, stamp tax exposure, and business-specific taxes depending on its activity model. The compliance burden becomes heavier if the company leases workplace premises, employs staff, or issues large numbers of commercial documents. (Türkiye Invest)
GİB’s taxpayer guidance also states that changes creating a new tax liability, changes in the nature of the tax registration, and increases or decreases in the number of workplaces within the same enterprise must be notified to the tax office within one month. This is important after incorporation because companies often assume only the initial registration matters, while many post-registration operational changes also have tax-notification consequences. (ivd.gib.gov.tr)
4. e-Notification Is Not Optional for Corporate Taxpayers
One of the most important post-incorporation duties in current Turkish tax practice is entry into the e-Notification (e-Tebligat) system. GİB’s official brochure states that corporate income taxpayers who are required to use the system must apply through the relevant tax office, and that newly established corporate taxpayers must apply within 15 days following the start-of-business date. A newer GİB infographic confirms the same 15-day deadline for corporate taxpayers.
This is not a minor digital preference. GİB’s official infographic states that documents sent through the e-Notification system are deemed served at the end of the fifth day following the date they reach the taxpayer’s electronic address, and those documents are not additionally sent by post. In other words, once the company enters the system, it must treat the electronic address as a real service address with real legal consequences.
For company directors and shareholders, this means e-Notification must be monitored actively from the first weeks after incorporation. A company that misses the application deadline or fails to monitor incoming notices can quickly lose control of tax procedure, objection periods, or debt-enforcement timelines.
5. Commercial Books and the New Electronic Commercial Ledger Regime
Another immediate post-incorporation obligation is the creation and maintenance of the company’s commercial books. Official Invest in Türkiye guidance states that the Trade Registry Directorate’s authorized personnel certify the company’s legal books during the establishment process, including the journal, ledger, inventory book, share ledger, manager’s meeting minutes book, and general assembly meeting minutes book. (Türkiye Invest)
This area changed materially for newly incorporated companies in 2026. The Ministry of Trade’s official ETDS materials state that, from 1 January 2026, all companies whose incorporation is registered in the trade registry are required to keep the relevant non-accounting commercial books through the Electronic Commercial Ledger System (ETDS). The Ministry’s ETDS guidance states that these books are created and activated simultaneously with the company’s registration, and that newly registered companies must designate an authorized ledger user at incorporation.
This means that for companies incorporated in 2026 and later, post-incorporation bookkeeping is no longer just about buying paper books and having them stamped. Founders must now understand that core corporate books—especially the share ledger and general assembly books—have moved into a more structured digital regime. Failing to organize ETDS access and responsibility correctly at incorporation can create governance problems later, especially when share transfers, board changes, or annual resolutions need to be recorded.
GİB’s taxpayer guidance also states that taxpayers obliged to keep books must preserve their books and documents for five years beginning from the calendar year following the relevant year, and must present them when requested by the competent authorities. So the obligation is not only to create the books, but to preserve and produce them properly. (ivd.gib.gov.tr)
6. Signature Circulars and Representation Must Be Operational Immediately
Post-incorporation obligations also include making the company’s representation structure legally usable. Official Invest in Türkiye guidance states that, on the day the company is registered at the Trade Registry Directorate, the signatories of the company issue a signature circular before authorized Trade Registry Directorate personnel. The same guidance notes that the tax officer’s determination report requires at least one authorized signature. (Türkiye Invest)
This matters because a Turkish company cannot function properly if its bank, tax, contract, and authority structure remain abstract. The signature circular is the practical legal bridge between the charter and the company’s real-world operations. Without it, many ordinary transactions will either be delayed or become harder to prove. (Türkiye Invest)
7. Social Security and Employer Registration
If the company will employ staff, social security compliance begins immediately after incorporation. Official Invest in Türkiye guidance states that the Trade Registry Directorate notifies the Social Security Institution ex officio and that the company must obtain a social security number. It also states that, for employees, a separate application must be made following the registration of the company with the Social Security Institution. (Türkiye Invest)
This means incorporation does not by itself make the company a fully activated employer. A Turkish company that plans to hire should treat employer-side SGK registration and employee reporting as part of the launch process, not as something to “sort out later” after the first salary is paid. (Türkiye Invest)
8. Foreign Employees and Foreign Owners May Trigger Work Permit Obligations
If the incorporated company will involve foreign personnel, one of the most important post-incorporation legal questions becomes work authorization. The Ministry of Labour’s official FAQ states that work permit applications are made through the e-İzin system, either domestically or from abroad, and that for domestic applications the relevant employer may apply for a work permit through e-Government where the foreigner has a valid Turkish residence permit of at least six months, subject to the Ministry’s broader rules. The same source also states that employers employing foreigners, and foreigners whose work permits are issued without attachment to an employer, must notify the Ministry within fifteen days of work-permit commencement, termination, and events requiring cancellation. (Çalışma ve Sosyal Güvenlik Bakanlığı)
This is especially important for foreign founders and foreign company owners because owning the Turkish company does not automatically equal a right to work in it. If the foreign person will actively manage, sign, or perform work on the ground in Türkiye, the company should assess work-permit compliance early instead of assuming the trade-registry title is enough. (Çalışma ve Sosyal Güvenlik Bakanlığı)
9. Annual General Assembly and Corporate Housekeeping
After incorporation, the company must also comply with ordinary corporate-governance timing rules. The Turkish Commercial Code states that the ordinary general assembly of a joint stock company must be held within three months after the end of each financial year, and the same three-month rule applies to the ordinary general assembly of an LLC. In a JSC, this annual meeting addresses matters such as financial statements, the board’s annual report, profit allocation, and discharge of the board. (Muğla Ticaret Müdürlüğü)
This rule is often underestimated by newly incorporated small companies, especially where there is only one shareholder or partner. But in Turkish law, even one-person companies must still respect the corporate-decision framework; the fact that there is only one owner simplifies the decision-making process, but it does not eliminate the obligation to document legally relevant annual decisions properly. (Muğla Ticaret Müdürlüğü)
In practice, this means that legal obligations after incorporation do not stop with tax and registry matters. The company must also maintain a proper internal governance cycle: annual financial statements, annual general assembly resolutions, manager or board-related approvals, and proper entry of those decisions into the relevant books. (Muğla Ticaret Müdürlüğü)
10. Independent Audit May Become a Post-Incorporation Obligation
Not every Turkish company is subject to independent audit immediately, but some companies are audited automatically because of their sector, and others become subject to audit after exceeding the relevant thresholds. The Turkish Commercial Code states that companies determined under the relevant framework are audited under Turkish Auditing Standards, and it further states that if the required audit is not performed, the financial statements and annual activity report are deemed not prepared. (Muğla Ticaret Müdürlüğü)
As of March 17, 2026, KGK announced that for fiscal years beginning on or after 1 January 2026, the general threshold group is assessed using TRY 500 million in assets, TRY 1 billion in annual net sales, and 150 employees, with the ordinary two-out-of-three, two-consecutive-years logic still applying. This does not affect every newly incorporated company immediately, but fast-growing companies and companies in regulated sectors should assess the issue early because audit status affects financial reporting, corporate records, and in some cases even digital-bookkeeping obligations.
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