What Is a Financial Seal?

 

 

A financial seal can be defined as a digital certificate specially issued for legal entities and used to sign and verify electronic documents. It is produced and distributed by the TÜBİTAK Public Certification Center (Kamu SM), which is authorized by the Revenue Administration.

Similar in nature to an electronic signature, the financial seal is used by companies, institutions, and businesses to ensure the security of electronic documents such as e-invoices and other official records. It verifies which organization issued the document and guarantees that its content has not been altered afterward.

It also helps protect the confidentiality and security of documents during digital transmission and storage. In this way, electronic documents gain the same legal validity as paper-based official documents.

 

 

What Is the Purpose of a Financial Seal?

 

A financial seal is an important authentication tool used in digital tax applications such as e-invoice, e-archive invoice, e-ledger, and e-delivery note systems. It ensures the reliability, accuracy, and legal validity of electronically created documents.

For documents signed with a financial seal, it can be clearly identified which legal entity created the document. It also guarantees that no changes were made after signing. This prevents unauthorized intervention and provides transaction security.

Within e-transformation systems, the financial seal is used to verify the identity of the issuer, preserve data integrity, and ensure non-repudiation of transactions. Documents approved with a financial seal serve as official evidence during tax audits and legal disputes.

 

 

Why Is a Financial Seal Important for e-Invoices?

 

The e-Invoice system is the digital equivalent of paper invoices and is supervised by the Revenue Administration. However, since invoices are issued electronically, ensuring their security and legal validity is essential.

The use of a financial seal is mandatory for logging into the e-Invoice portal, issuing invoices, and submitting them to the Revenue Administration. Without a financial seal, e-invoice transactions cannot be carried out. Therefore, it is not only a security tool but also a legal requirement.

 

Importance of the Financial Seal for e-Invoices

 

Identity Verification:
The identity of the taxpayer issuing the invoice is confirmed through the financial seal. This makes it clear which company issued the invoice.

Document Integrity:
The content of an invoice approved with a financial seal cannot be altered. Any later modification may render the document invalid.

Official Approval:
For an e-invoice to be legally valid, it must be approved with a financial seal. Documents without a seal are not considered valid e-invoices.

Secure Storage and Transmission:
It ensures data security during the sending and storage of invoices in digital environments.

Electronic Submission:
e-Invoices must be stored electronically together with their financial seal and submitted digitally when requested, rather than being kept only as printed copies.

 

 

Who Can Use a Financial Seal?

 

A financial seal is a digital certificate issued only for legal entities. Individuals cannot use a financial seal. Sole proprietorships and self-employed professionals use a qualified electronic signature (e-signature) instead.

The following organizations may use a financial seal:

• Joint stock companies
• Limited liability companies
• Ordinary partnerships
• Public institutions and organizations
• Universities
• Foundations and associations
• Authorized company representatives

If the authorized person changes, usage authorization must also be updated and necessary applications must be renewed.

 

 

Where to Apply for a Financial Seal?

 

Applications for a financial seal are made through the TÜBİTAK Public Certification Center (Kamu SM), which is authorized by the Revenue Administration. Applications are completed online through the official Kamu SM website.

 

 

How to Apply for a Financial Seal?

 

 

During the application process, applicants choose whether they are applying as an individual or a legal entity. Company applications must be completed by authorized representatives. The general process is as follows:

• Identity and company information are entered completely.
• Tax number, authorization documents, and required records are uploaded.
• The certificate validity period is selected.
• Payment is completed online by credit or debit card.
• The application is reviewed.
• Once approved, the financial seal is delivered to the specified address by courier.
• After installation, it becomes ready for use.

The Kamu SM application only covers the certificate process. Applications for e-Invoice and e-Ledger systems must also be made separately through the Revenue Administration.

 

 

Validity Period of the Financial Seal

 

Financial seal certificates are valid for 3 years. Reminder emails are sent before expiration. To avoid interruptions in transactions, renewal applications should be completed on time.

 

 

Financial Seal Prices

 

Financial seal fees are updated annually by the Revenue Administration and TÜBİTAK Kamu SM. Current prices should be checked on the official website.

As of 2026, the distinction between individuals and legal entities has been removed, and a single pricing tariff has been introduced.

 

3-Year Standard Financial Seal Package (Certificate + Card Reader):

₺1,740 (₺1,450 + VAT)

Sole proprietorships may also choose to use an e-signature instead of a financial seal when applying for e-Invoice services.

 

 

What Is the Difference Between an E-Signature and a Financial Seal?

 

An electronic signature is issued to individuals and used for identity verification on digital documents. It is the electronic equivalent of a handwritten signature. It confirms the signer’s identity and protects document integrity. A Qualified Electronic Certificate (QEC) is required for its use.

A financial seal, on the other hand, is issued for companies and institutions. It is used to sign corporate documents such as e-Invoices, e-Ledgers, e-Archive Invoices, and e-Delivery Notes. In this sense, it functions as a corporate stamp and digital signature.

Although both systems are used to secure electronic documents, the main difference is that e-signatures are for individuals, while financial seals are for legal entities.