Ana sayfa/What is the KKS system?
What is the KKS system?
SHORT ANSWER
KKS (Kimyasal Kayıt Sistemi — Chemical Registration System) is the official online platform of the Turkish Ministry of Environment, Urbanisation and Climate Change through which all KKDIK obligations are submitted: pre-SIEF enquiries, SIEF participation, provisional registration, full registration and notifications. Nothing prepared outside KKS counts as a registration.
Last regulatory review: 27 August 2026 · Reviewed by: ONAY Mühendislik technical team · Basis: KKDIK Regulation (Official Gazette 23.06.2017/30105) and its amendment of 23.12.2023, No. 32408
KKS (Chemical Registration System) is the online platform of Turkey’s Ministry of Environment, Urbanisation and Climate Change through which KKDIK pre-MBDF, MBDF, registration and notification processes are carried out. It is the KKDIK equivalent of the EU’s REACH-IT system.
Related pages
Contact ONAY Mühendislik for KKDIK and REACH support.
Official source: KKDIK Regulation — Turkish Official Gazette.
Türkçe sürüm: KKS (Kimyasal Kayıt Sistemi) nedir?
What can be done in KKS?
| Action | Purpose | Who it concerns |
|---|---|---|
| Company account and user roles | Registering the legal entity and authorising the people who will act for it | All companies in scope |
| Pre-SIEF enquiry | Checking whether another registrant exists for the substance and whether a Lead Registrant has been appointed | Manufacturers and importers |
| SIEF participation | Data sharing and joining the joint submission through the Substance Information Exchange Forum | Co-registrants of the same substance |
| Provisional registration | Obtaining a provisional registration number per substance before the 30 September 2026 threshold | Companies manufacturing or importing 1 tonne/year or more |
| Full registration dossier | Submitting the IUCLID technical dossier and, where required, the chemical safety report | Phased by tonnage band: 2026 · 2028 · 2030 |
| Only Representative appointment | A non-Turkish manufacturer appointing a representative established in Türkiye | Exporting manufacturers and their importers |
| Status tracking | Following the stage of a submission and the registration numbers issued | Registrants and their consultants |
The critical 2026 threshold: 30 September
One date makes KKS urgent in 2026. By 30 September 2026, every substance manufactured in or imported into Türkiye at 1 tonne/year or more is expected to hold at least a provisional registration number obtained through KKS. A substance without one cannot be placed on the market after that date.
Full registration itself is phased separately by tonnage and hazard criteria: 31 December 2026, 31 December 2028 and 31 December 2030. The most common mistake is to look at the later full-registration date and miss the 2026 threshold. A substance in the 1–10 tonne band has a full registration deadline of 31 December 2030, yet it must still hold a provisional registration number on 30 September 2026. See our KKDIK registration deadlines page for the full table.
What if the Lead Registrant is not ready?
If no Lead Registrant has been appointed, or the lead has not started the process, waiting does not suspend the obligation. In that case a company may follow the individual provisional registration route, provided the reason is stated explicitly in KKS. Waiting for a price or a Letter of Access from the lead does not postpone 30 September 2026.
| Situation | Route in KKS |
|---|---|
| Lead appointed, joint registration open | Joining the joint submission via SIEF is assessed |
| Lead exists but gives no price or LoA | Individual provisional registration is not delayed; correspondence is kept as evidence |
| No Lead Registrant can be identified | Individual provisional registration with the reason stated in KKS |
| Substance purchased from a supplier | Downstream user status and the supplier’s registration number are verified |
| Tonnage or substance list not final | The company decision is obtained in writing and tonnage is evidenced |
KKS and REACH-IT are not interchangeable
KKS is the Turkish counterpart of REACH-IT, but the two belong to different legal frameworks. A registration made with ECHA under EU REACH does not satisfy the KKDIK obligation. An EU manufacturer exporting to Türkiye must appoint an Only Representative established in Türkiye, and the registration must be submitted through KKS. See Only Representative services.
Frequently asked questions
Who must be registered in KKS?
Companies manufacturing in or importing into Türkiye 1 tonne/year or more of a substance, together with Only Representatives acting for non-Turkish manufacturers. Downstream users are not registrants but must be able to evidence their position in the supply chain.
Are KKS and KKDIK the same thing?
No. KKDIK is the regulation on the Registration, Evaluation, Authorisation and Restriction of Chemicals; KKS is the software through which the obligations under that regulation are carried out.
When is the provisional registration number issued?
After a complete submission is made through KKS and processed by the Ministry. The number belongs to the company–substance pair, not to the company alone.
Is the Ministry fee included in consultancy fees?
No, they are separate items. The registration fee paid to the Ministry follows an official tariff and is independent of any consultancy fee. See KKDIK registration fees 2026.
How ONAY Mühendislik supports you
We assess your substance inventory on a CAS/EC basis, determine which route applies to each substance — joint registration, individual provisional registration or downstream user verification — and carry out the submissions through KKS.
Request a scope assessment · KKDIK & REACH consultancy · What is a Letter of Access (LoA)?