Corporate Tax Services in Türkiye: 2026 Complete Guide

Operating a company in Türkiye requires careful attention to corporate tax services, regulatory compliance, and strategic tax planning. As tax legislation continues to evolve in 2026, both local and foreign-owned businesses must adapt quickly to remain compliant and financially efficient.

At Finlexia Turkish Accounting Firm, we have been supporting businesses since 2017 with comprehensive, multilingual corporate tax services tailored to Türkiye’s regulatory framework. As a trusted Istanbul accountant, we help companies manage risk, optimize tax positions, and focus on sustainable growth.

Our Turkish accountants explain corporate tax services in Türkiye, current regulations, compliance requirements, and how professional tax support adds long-term value.

Table of Contents

Overview of Corporate Tax in Türkiye

Corporate tax in Türkiye is primarily governed by the Corporate Tax Law (Law No. 5520). The tax applies to resident and non-resident entities generating income within Türkiye.

Key points for 2026 include:

• Taxable entities: Joint stock companies (A.Ş.), limited liability companies (Ltd. Şti.), branches of foreign companies, cooperatives, and certain partnerships
• Tax base: Worldwide income for resident companies; Türkiye-sourced income for non-residents
• Filing obligation: Annual corporate tax return, plus periodic advance tax returns
• Documentation: Mandatory bookkeeping, financial statements, and supporting schedules

Given the increasing scrutiny by tax authorities, working with a professional Turkish accounting firm is essential for accuracy and compliance.

Scope of Corporate Tax Services in Türkiye

Corporate tax services go far beyond filing a single annual return. At Finlexia CPA, our services cover the full corporate tax lifecycle.

Corporate Tax Calculation and Filing

We prepare and submit:

• Annual corporate income tax returns
• Quarterly advance corporate tax returns
• Withholding tax declarations related to corporate activities
• Corrections, amendments, and voluntary disclosures

Accuracy in tax calculation reduces the risk of penalties and ensures alignment with Turkish tax legislation.

Filing Deadlines for 2026

Staying ahead of the tax calendar is crucial. Here are the key dates for 2026:

Corporate Tax Compliance and Risk Management

Maintaining full tax compliance is a legal obligation and a strategic priority. Turkish tax audits are becoming more frequent and data-driven, making compliance failures costly.

Our compliance-focused services include:

• Review of accounting records and tax reconciliations
• Verification of deductible and non-deductible expenses
• Compliance with documentation and retention requirements
• Ongoing monitoring of legislative updates

As an experienced Istanbul CPA firm, we help businesses maintain a strong compliance posture while avoiding unnecessary exposure.

Strategic Corporate Tax Planning

Corporate tax planning in Türkiye must balance tax efficiency with regulatory integrity. Poorly structured planning can attract audits or penalties.

Our tax planning services focus on:

• Structuring transactions tax-efficiently
• Optimizing deductible expenses and allowances
• Managing group taxation and intercompany transactions
• Evaluating tax incentives, exemptions, and investment supports

Strategic planning allows companies to legally minimize tax burdens while supporting long-term business objectives.

Corporate Tax Registration and Structural Setup

Corporate tax obligations begin at the moment of incorporation or registration of a foreign entity in Türkiye.

We support clients with:

• Corporate [tax registration] for newly established companies
• Registration of branches and liaison offices
• VAT, withholding tax, and social security registrations
• Ongoing updates to tax records following structural changes

This integrated approach ensures that corporate tax obligations are aligned from day one, especially during company formation stages.

Corporate Tax Advisory for Foreign Investors

Türkiye remains a strategic market for international investors. However, foreign-owned companies face additional corporate tax complexities, including:

• Permanent establishment risks
• Double taxation treaty application
• Transfer pricing regulations
• Cross-border dividend, royalty, and interest taxation

Our multilingual team provides tailored corporate tax advisory, helping foreign investors navigate Turkish regulations confidently while remaining compliant with international standards.

Corporate Tax and Financial Reporting Integration

Corporate tax services cannot be isolated from accounting and reporting functions. Tax calculations depend on accurate financial statements prepared under Turkish accounting standards.

As part of our integrated accounting services in Türkiye, we ensure:

• Alignment between accounting records and tax filings
• Consistency across statutory and management reporting
• Proper treatment of provisions, depreciation, and accruals
• Reliable data for tax audits and inspections

This integration minimizes discrepancies that could trigger tax authority inquiries.

Corporate Tax Audit Support and Defense

Tax audits are a standard aspect of doing business in Türkiye. Preparation and professional representation significantly reduce risks.

Our corporate tax audit support includes:

• Pre-audit tax reviews and risk assessments
• Assistance during tax inspections
• Preparation of explanations and supporting documentation
• Representation before tax authorities and reconciliation commissions

Through close coordination with our audit services team, we ensure consistency between audited financials and tax filings.

Industry-Specific Corporate Tax Solutions

Different industries face different corporate tax challenges. Our firm provides sector-focused tax services for:

• Manufacturing and export companies
• Technology and software firms
• E-commerce and digital platforms
• Real estate and construction companies
• Professional services and holding structures

By understanding industry-specific risks and incentives, we provide more accurate and effective tax solutions.

Why Choose Finlexia Turkish Accounting Firm?

Since 2017, Finlexia Turkish Accounting Firm has been a trusted advisor to local and international companies operating in Türkiye. Our strengths include:

• Deep expertise in Turkish corporate tax legislation
• Multilingual service capability
• Integrated accounting, tax, and audit solutions
• Proactive advisory approach rather than reactive compliance

As a leading accounting firm based in Istanbul, we focus on delivering clarity, compliance, and confidence to our clients.

Contact us for Corporate Tax Services in Türkiye

For reliable and forward-looking corporate tax support in Türkiye, partnering with the right advisor is critical. Finlexia Turkish Accounting Firm is ready to assist your business with corporate tax compliance, planning, registration, and advisory services tailored to your industry and structure.

If your company operates in Türkiye or plans to enter the Turkish market, professional corporate tax support is essential in 2026 and beyond. Contact Finlexia Turkish Accounting Firm today to discuss how our corporate tax services can help you remain compliant, optimize your tax position, and support sustainable growth.