Legal Requirements for E-Invoicing in Türkiye: 2026 Ultimate Guide

As Türkiye continues its rapid digital transformation, e-invoicing (e-Fatura) has become a cornerstone of the country’s tax compliance framework. Driven by the Revenue Administration of the Ministry of Treasury and Finance (Gelir İdaresi Başkanlığı – GİB), e-invoicing is no longer a voluntary digital convenience but a legal obligation for a growing number of businesses operating in Türkiye.

At Akkas CPA & Turkish Accounting Firm, a leading full-service company formation and corporate governance firm based in Istanbul since 2017, we regularly advise local and foreign investors on e-invoicing obligations, tax compliance, and corporate structuring.

Table of Contents

Our Turkish accountants team provides a clear, up-to-date, and practical overview of the legal requirements for e-invoicing in Türkiye as of 2026, helping businesses remain compliant and avoid administrative penalties.

What Is E-Invoicing in Türkiye?

E-invoicing in Türkiye refers to the electronic issuance, transmission, storage, and reporting of invoices through systems authorized by the Turkish Revenue Administration (GİB). An e-invoice carries the same legal validity as a paper invoice, provided it complies with the technical and legal standards set forth by Turkish tax legislation.

The core objectives of the e-invoicing system are:

• Increasing tax transparency
• Reducing the informal economy
• Enhancing audit efficiency
• Streamlining business processes

Legal Basis for E-Invoicing in Türkiye

The legal framework governing e-invoicing is primarily based on:

• Tax Procedure Law No. 213
• Communiqué No. 509 and subsequent amendments
• GİB technical guidelines and circulars

These regulations empower the Revenue Administration to mandate e-invoicing for certain taxpayers based on turnover thresholds, sectoral activity, or transaction volume.

Who Is Required to Use E-Invoicing in 2026?

As of 2026, the scope of mandatory e-invoicing has expanded significantly. Businesses must carefully assess whether they fall within the compulsory regime.

1. Turnover Thresholds

Companies exceeding the annual gross sales revenue thresholds announced by GİB are required to transition to e-invoicing. These thresholds are periodically updated and now apply to a broader range of SMEs.

2. Sector-Specific Obligations

E-invoicing is mandatory regardless of turnover for businesses operating in regulated or high-risk sectors, including:

• Fuel and energy distribution
• Alcohol, tobacco, and automotive sales
• Online marketplaces and e-commerce intermediaries
• Real estate and construction activities

3. Corporate Structure

Entities incorporated as a joint-stock company or a limited liability company are more frequently subject to mandatory digital compliance due to their reporting obligations and scale of operations.

Types of E-Documents Related to E-Invoicing

E-invoicing in Türkiye is part of a broader digital ecosystem. Businesses may also be required to issue related electronic documents, including:

• E-Archive Invoice (e-Arşiv Fatura)
• E-Dispatch Note (e-İrsaliye)
• E-Ledger (e-Defter)

Failure to integrate these systems correctly may trigger audits or administrative fines.

Mandatory Transition Thresholds for 2026

The most significant change for 2026 involves the lowering of gross sales revenue thresholds. Historically, e-invoicing was reserved for high-turnover enterprises. However, current regulations indicate that almost all taxpayers will be integrated into the system by 2026.

• General Threshold: Companies with gross sales revenue exceeding 3 Million TRY in the 2024 or 2025 fiscal years must transition to the e-Fatura (e-Invoice) and e-Arşiv (e-Archive) systems by early 2026.
• Sector-Specific Rules: Lower thresholds (often 500,000 TRY) apply to specific high-risk sectors including e-commerce, real estate, and motor vehicle dealers.
• Zero-Threshold Sectors: Companies in the accommodation and hotel industry are generally required to use e-invoicing regardless of their annual turnover.

Understanding the Dual-System: e-Fatura vs. e-Arşiv

The Turkish e-invoice regime is divided into two distinct applications. Understanding which one to use for a specific transaction is a fundamental legal requirement.

• e-Fatura: This is a closed-circuit system used for B2B (Business-to-Business) and B2G (Business-to-Government) transactions where both parties are registered with the GİB. The invoice is transmitted instantly via the GİB portal.
• e-Arşiv: This system is used for transactions with customers not registered in the e-Fatura system, including B2C (Business-to-Consumer) sales and exports. These invoices must be reported to the GİB by the end of the next business day.

The Necessity of the “Mali Mühür” (Financial Seal)

For any legal entity to issue a valid e-invoice, they must obtain a Mali Mühür. This is a hardware-based or cloud-based digital certificate issued by the Public Certification Center (Kamu SM).

Without a valid financial seal, your company cannot authenticate documents, meaning any invoice issued would be legally void. Our company formation lawyers emphasize that securing this seal should be one of the first steps taken immediately after the tax office activation of a new company.

Registration and Application Process

Step 1: Eligibility Assessment

The first step is determining whether your company is legally required to adopt e-invoicing or whether voluntary adoption is strategically advisable.

Step 2: Electronic Signature or Financial Seal

Companies must obtain:

• A qualified electronic signature (for individuals), or
• A financial seal (for legal entities)

Step 3: System Selection

Businesses can choose one of the following:

• GİB Portal (basic and limited functionality)
• Authorized private integrators
• Direct system integration (recommended for large enterprises)

Technical and Operational Requirements

To remain compliant, companies must ensure:

• Invoices are issued in the UBL-TR format
• Real-time or near-real-time transmission to GİB
• Secure electronic archiving for at least 10 years
• Compatibility with accounting and ERP systems

Proper internal controls and IT governance are essential, particularly for foreign-owned entities newly entering the Turkish market through company formation in Türkiye.

Penalties for Non-Compliance

Non-compliance with e-invoicing obligations can result in:

• Administrative fines per invoice
• Special irregularity penalties
• Disallowance of tax deductions
• Increased audit exposure

Penalties may apply even if invoices are issued late or incorrectly formatted.

E-Invoicing for Foreign-Owned Companies

Foreign investors establishing operations in Türkiye often underestimate digital tax compliance requirements. Whether operating through a branch or a newly incorporated entity, companies must align their invoicing systems with Turkish legislation from day one.

Engaging experienced company formation lawyers ensures that e-invoicing, tax registration, and corporate governance obligations are handled in a fully compliant manner.

Benefits of Early and Proper Compliance

Beyond legal necessity, e-invoicing offers tangible business advantages:

• Reduced administrative costs
• Faster payment cycles
• Improved audit readiness
• Enhanced data accuracy
• Environmental sustainability

Companies that implement e-invoicing proactively often gain operational efficiencies that extend well beyond tax compliance.

Practical Compliance Tips for 2026

• Regularly monitor GİB announcements and threshold updates
• Conduct annual compliance audits
• Train finance and accounting teams
• Align internal workflows with digital document management
• Seek professional legal and tax advisory support

How Akkas CPA & Turkish Accounting Firm Can Assist

At Akkas CPA & Turkish Accounting Firm, we provide end-to-end advisory services covering corporate formation, tax compliance, digital transformation, and ongoing governance. With over 9+ years of experience and a multilingual team in Istanbul, we support domestic and international clients in navigating Türkiye’s evolving regulatory landscape.

If you require tailored advice on e-invoicing compliance, system selection, or corporate structuring, we invite you to contact Akkas CPA & Turkish Accounting Firm. Our legal and tax professionals are ready to help your business remain compliant, efficient, and future-ready in Türkiye.