Quick answer: A Turkish company stamp (kaşe) is widely used in day-to-day business, but it should not be described as a universal legal condition for the validity of every company contract, invoice or official act. The legally important question is usually who has authority to represent the company and whether the document has been executed in the required form.
This guide explains the company seal / kaşe requirement: when the stamp is a practical business tool, when signature/representation authority matters more, and what foreign founders should prepare after registration.
Is a Company Seal Legally Mandatory in Turkey?
Do not use the blanket statement “a Turkish company cannot operate without a seal.” Turkish company law focuses on the company’s registered trade name, representatives and signature authority. A rubber company stamp can be requested as a practical document-identification tool, but it is not a substitute for valid representation and it does not automatically make an unauthorised signature binding.
Key rule: A stamp identifies the company on the document; registered representation rules determine who can bind the company.
The Turkish Commercial Code frames company execution around the trade name and the authorised person’s signature, not around a rubber stamp. The Ministry of Trade also describes the mandatory signature declaration for company representatives as the representative’s signature placed under the company trade name and filed through the Trade Registry procedure. A kaşe can help reproduce company data, but it is not the legal source of representation authority.
Why Companies Still Use a Kaşe
Even where the law does not make the stamp the decisive validity element, Turkish businesses commonly use a kaşe because it is a fast way to place recurring company information on documents.
Typical practical uses include:
- placing the registered company title and tax details on internal or commercial paperwork;
- supplier/customer forms;
- bank or administrative forms where the institution’s own procedure asks for a stamp;
- receipts, delivery forms and other routine documents;
- helping staff distinguish which company/entity is signing a document.
An institution can ask for a stamp as part of its operational procedure. That should not be turned into a general legal statement that every Turkish contract or invoice is invalid without one.
A kaşe is a common operational tool, but representation authority remains the legal control point.
What Information Should a Company Stamp Contain?
There is no responsible reason to invent a universal statutory stamp template. In practice, companies commonly include enough data to identify the legal entity, such as:
- full registered company title;
- tax office and tax identification number;
- Trade Registry / MERSİS information where useful;
- registered address or contact information where operationally helpful.
The most important practical control is accuracy. If the company title, tax number or other data have changed, stop using an outdated stamp and prepare a corrected one.
Company Stamp vs Signature Circular
| Item |
What it shows |
What it does not prove by itself |
| Company stamp / kaşe |
Company-identification information printed on the document |
That the person signing has authority |
| Signature circular / representation record |
How registered representatives are authorised to sign for the company |
That every document type has been executed in the correct special form |
| Handwritten or electronic signature |
The act of the authorised signer |
Authority if the person is not actually authorised |
If the registered representation structure requires two authorised people to sign jointly, adding a company stamp to one person’s signature does not convert that into valid joint representation.
Do You Need the Stamp to Prepare a Signature Circular?
Avoid a universal sequence such as “first make the stamp, then the notary cannot issue the signature circular without it.” The notarial/signature procedure should be checked for the current company record and transaction.
The key inputs are the registered company information, representative identity and the representation authority shown in the Trade Registry/MERSİS record. A company may still choose to have the kaşe ready because notaries, banks or other institutions can ask for it as part of their practical documentation process.
Does Every Invoice Need a Company Seal?
No blanket rule should say that every Turkish invoice is invalid unless it bears a rubber company stamp. For a paper invoice, the Tax Procedure Law contains a separate signature requirement for the business owner or a person authorised to sign on the owner’s behalf; that should not be confused with a mandatory rubber kaşe. Electronic invoices and e-Arşiv documents follow their applicable electronic-document signing/authentication rules instead of a universal physical-stamp rule.
For current invoicing rules, use:
Does Every Bank Require a Company Seal?
Bank procedures vary. A bank may ask for the kaşe on its forms, but corporate-account opening is controlled primarily by the bank’s KYC/AML review, registered representatives, signature authority and bank-specific documentation.
Do not promise that obtaining a stamp will make a bank account usable or approved.
See How to Open a Business Bank Account in Turkey.
Workon coordinates company registration and connected post-registration document workflows according to the agreed scope.
How to Order a Kaşe After Registration
Once the company’s registered title and tax/company identifiers are confirmed, ordering a rubber stamp is normally a simple commercial task through a stationery/stamp provider.
A sensible sequence is:
- Confirm the company has been legally registered.
- Copy the legal title and identifiers from the current official records.
- Decide which practical data should appear on the stamp.
- Proofread every line before production.
- Keep the stamp controlled so it is not used on documents without the authorised signer’s approval.
Do not rely on old blog prices such as “TRY 100–250.” Stamp pricing is a retail market cost and should be checked when ordered rather than presented as a permanent statutory fee.
What Happens if the Company Name or Details Change?
If the registered company title, tax details or other information printed on the kaşe changes, replace the stamp so it does not place outdated information on new documents.
A name change or manager/representation change is primarily a Trade Registry/MERSİS corporate-change process. Whether another notarial signature document is required depends on the new representation record and transaction; do not assume the rubber stamp itself controls the legal effect of the change.
What if the Stamp Is Lost?
A lost stamp should be treated as an operational-control issue. Replace it, inform relevant staff, and monitor for unauthorised use where the circumstances create risk.
Losing a rubber stamp does not automatically change the registered representatives or representation authority of the company. If there is suspicion of misuse, seek case-specific legal advice and notify institutions where appropriate.
Branches and Multiple Offices
A company may use separate operational stamps for branches, departments or offices for convenience, but that does not create or change the legal representation structure.
If a branch is separately registered, ensure any branch stamp accurately reflects the branch/company information used for that operation. For second-location questions, use How to Open a Second Office in Turkey.
Company Seal vs E-Signature, KEP and Financial Seal
These are different tools and should not be described as digital versions of the same rubber stamp.
| Tool |
Main function |
| Kaşe |
Physical company-information stamp used operationally |
| Secure electronic signature (e-imza) |
Electronic signature of a natural person under Law No. 5070; company-binding authority must still come from the representation record |
| KEP |
Registered electronic-mail infrastructure providing legally significant transmission evidence |
| Financial seal (mali mühür) |
Electronic certificate/tool used in specified tax/e-document processes for entities |
Dedicated guides:
Common Company Stamp Mistakes
| Mistake |
Why it is wrong |
Better approach |
| Calling the kaşe a state-issued official seal |
It is normally a commercially produced company stamp |
Describe it as an operational stamp |
| Saying a stamp makes every contract valid |
Authority and required legal form still matter |
Check representation/signature rules |
| Saying every invoice needs a physical stamp |
Ignores electronic invoicing rules |
Follow current GİB invoice requirements |
| Using outdated company information |
Creates confusion and rejected paperwork |
Replace the stamp after registered-data changes |
| Assuming the stamp replaces e-signature/KEP/mali mühür |
They serve different legal/technical functions |
Use the correct tool for each workflow |
How Workon Fits Into the Post-Registration Workflow
Workon coordinates company setup and post-registration operational workflows for foreign founders and overseas companies entering Türkiye. Depending on the agreed scope, this can include company-document preparation coordination, registered representation/signature steps, KEP/e-signature/financial-seal sequencing and bank/tax onboarding coordination.
Regulated legal, tax, accounting and notarial services remain with the appropriately authorised professionals and institutions.
Review Workon’s company registration and operational coordination service.
Official Reference Points
Last reviewed: 17 September 2026. Institution-specific form requirements can differ; confirm the current procedure for the exact bank, notary or authority.
Frequently Asked Questions
No. A rubber company stamp is not a universal condition for document validity. Turkish company law focuses on the company trade name, the authorised signer, registered representation rules and any form required for the transaction. A bank, notary or other recipient can still ask for a kaşe as part of its own operational procedure.
No universal physical-kaşe rule applies to every invoice. For a paper invoice, the Tax Procedure Law has a separate signature requirement for the business owner or a person authorised to sign on the owner’s behalf; that is different from requiring a rubber stamp. e-Fatura and e-Arşiv follow the applicable electronic-document rules instead.
There is no one universal statutory kaşe template. Use the current registered company title and accurate identifiers. Companies commonly include tax-office and tax-number information, with registry, address or contact details where operationally useful, and should replace the stamp after relevant registered-data changes.
Ask a stamp supplier for its current production time and quote after confirming the company’s registered details. This is a commercial purchase; an old retail price range or a universal production-time promise should not be treated as a statutory fee or guaranteed service.
No. The stamp identifies the company on the document. Representation authority comes from the company’s current registered representation structure and the applicable signature\/form requirements. A kaşe cannot cure an unauthorised signature or replace a required second signature where joint representation applies.
No. Ordering a rubber stamp is a commercial task. The mandatory signature declaration for a company representative concerns the authorised person’s signature under the company trade name in the Trade Registry process, while a bank, notary or other institution may separately request current representation or signature evidence for its own transaction. A kaşe does not replace those records.
Disclaimer: This guide provides general information, not legal, tax, banking or document-execution advice. The legal effect of a document depends on the authorised signer, registered representation, applicable form and transaction facts; an institution may separately request a kaşe. Verify the current official record and obtain appropriately qualified advice before executing or relying on a material company document.
