What is a signature circular (imza sirküleri)?
The imza sirküleri is the notarised document showing who is authorised to sign on behalf of a Turkish company, in what capacity, within which limits, and bearing their specimen signatures. It is issued on the basis of the signatory authority registered with the trade registry (the board’s authority resolution and, where used, an internal directive under TCC Arts. 367 and 371(7) setting the duties and powers of commercial agents or other auxiliaries with limited authority). Law No. 7263, in force since early 2021, amended Article 40 of the Turkish Commercial Code, and the secondary legislation that followed removed the requirement to prepare a separate circular for company signatories: representation authority is now verified from the trade registry and its certificate (sicil tasdiknamesi). In practice, banks, notaries and counterparties still ask for the circular.
How joint signature and other authority limits affect third parties, how the circular differs from a power of attorney, and what banks ask for today are covered in detail in the guide.
Related: board of directors, share ledger.