A relative in Turkey signs a bank form for you because you could not travel. A business partner signs a lease in the managing director’s name while the director is abroad. A family member signs for a parcel, a delivery note or a tenancy renewal “just to get it done”. In many countries this is treated as a private matter between the people involved. Under Turkish law, signing someone else’s name can amount to document forgery, and the consent of the person named does not automatically change that. Below we explain when signing for someone else is a crime in Turkey, what role consent plays and how to sign on someone’s behalf the lawful way.
At a glance
- Signing another person’s name as if it were their signature means producing a forged document. Art. 204 of the Turkish Penal Code (TCK) applies to official documents, Art. 207 to private documents.
- Promissory notes, cheques and wills are private documents but are punished like official documents (TCK 210).
- A false signature used to prove a genuine debt or a true fact is still forgery; the law only halves the penalty (TCK 211).
- The lawful route is representation: you sign with your own signature and state on whose behalf you sign (Art. 40 Turkish Code of Obligations, TBK).
- Statutory provisions are stated as in force on 23 October 2026.
Is signing for someone else a crime in Turkey?
It can be. A person who writes another’s name and signs as if the signature were theirs creates a document that appears to come from that person but does not. The Turkish Penal Code calls this “drawing up a document falsely”. How closely the signature resembles the real one is not the point: writing someone else’s name in your own handwriting, without trying to imitate anything, can be enough to make the document false.
The penalty depends on the type of document. Forging or using a forged official document carries two to five years’ imprisonment1. For a private document, such as a lease, a sales contract or a delivery note, the range is one to three years, and the law also requires that the document is used. Promissory notes, cheques, share certificates and wills are listed separately: although private, they are punished under the rules for official documents. For the penalties and how to challenge a forged signature, see our article on forged signature penalties in Turkey.
Does the other person’s consent make it legal?
Not automatically, and this is where foreign clients are most often surprised. The Turkish Penal Code excludes punishment for acts done with the consent of a person regarding a right they can freely dispose of1. Document forgery, however, sits in the chapter on “Offences against Public Trust”. What the law protects is not only the right of the person whose name was used, but the trust that everyone who relies on the document places in the signature. Consent from the named person therefore does not remove liability on its own; the type of document, the person it is presented to and its purpose decide the outcome.
The law also addresses cases that look well-intentioned. Under TCK 211, if forgery is committed to prove a claim based on a legal relationship or to document a true fact, the penalty is reduced by half. It is reduced, not removed. “He owed the money anyway” or “she would have signed it herself” does not change the fact that an offence was committed. Whether and how these provisions apply to a specific case is a question for a Turkish lawyer.
How to sign on someone’s behalf in Turkey
Turkish law calls this representation, and the rule is simple: you do not sign the other person’s signature, you sign your own and state clearly on whose behalf you are signing. Under the Turkish Code of Obligations, a transaction made by an authorised representative in another person’s name binds that person directly; if the representative does not disclose that capacity, the consequences fall on the representative2. A signature must also be handwritten, as we explain in what is a wet ink signature.
What if you have no authority? The law covers that too. A transaction made by someone acting as a representative without authority binds the person represented only if they approve it; if they do not, the other party can claim damages from the unauthorised representative2. In the worst case, a document you signed openly “on behalf of” someone leaves you personally liable. A document on which you imitated someone else’s signature can lead to a criminal investigation. Turkish banks, notaries and public authorities usually accept transactions on someone else’s behalf only with a notarised power of attorney. If you live abroad, a power of attorney can be issued at a Turkish consulate.
What if someone signed your name on a Turkish document?
State clearly that the signature is not yours and watch the deadlines. Where enforcement proceedings are based on a promissory note, the period to object to the signature is short; we set out the steps in forged signature on a promissory note in Turkey. The next step is to establish technically who wrote the signature.
A forensic document examiner compares the questioned signature with signatures you made in the same period that are certainly yours. A signature written by someone else often shows signs of imitation: slow and careful strokes, pen lifts, blunt beginnings and endings. We describe these in how is a forged signature detected. If handwriting samples of the person you suspect are available, the examination can also address whether the signature came from that person. The opposite also happens: a person may deliberately distort their own signature in order to deny it later, which we cover in disguised signatures. You can send documents from outside Turkey; see document examination from abroad.
This article is for general information only and is not legal advice. Statutory provisions are stated as in the Turkish Penal Code and the Turkish Code of Obligations in force on 23 October 2026.
Who really signed your document?
Send us a scan of the questioned document and genuine signatures from the same period. We report a preliminary analysis within 24 hours and, if requested, a detailed report within 48 hours, in English, German or Turkish.
Signature examination Get an expert opinion +90 505 215 71 10
Istanbul · Ankara · Adana
Sources
- Turkish Penal Code No. 5237, Arts. 26, 204, 207, 209, 210, 211. mevzuat.gov.tr
- Turkish Code of Obligations No. 6098, Arts. 15, 40, 46, 47. mevzuat.gov.tr
Frequently Asked Questions
Is it illegal to sign someone else's name in Turkey?
It can be document forgery. Forging an official document carries two to five years' imprisonment (TCK 204), a private document one to three years (TCK 207). Promissory notes, cheques and wills are punished like official documents (TCK 210).
Is it still forgery if the person agreed?
Consent does not remove liability on its own. Turkish law places document forgery among offences against public trust, so what is protected is the trust of everyone relying on the document. Even forgery to document a true fact only halves the penalty (TCK 211).
How do I sign on someone's behalf in Turkey?
Sign with your own signature and state on whose behalf you sign (TBK 40). Banks, notaries and authorities usually require a notarised power of attorney, which can also be issued at a Turkish consulate abroad.
How can I prove a signature in my name is not mine?
A forensic document examiner compares the questioned signature with signatures from the same period that are certainly yours. If handwriting samples of the suspected writer exist, the examination can also address whether that person wrote it.
