Setting up a company in Türkiye is only half the battle. Once your entity is registered with the Trade Registry and MERSIS, staying compliant with the Gelir İdaresi Başkanlığı (GIB) Türkiye’s Revenue Administration becomes your ongoing, non-negotiable legal obligation. Non-compliance can trigger crippling fines, accumulating tax penalties, interest charges, and even forced deregistration of your company.
For foreign founders, CFOs, and investors from India, Pakistan, Europe, and beyond, understanding Türkiye’s tax landscape is critical. This comprehensive guide breaks down everything you need to know about GIB compliance, e-invoicing mandates, corporate tax filings, VAT obligations, withholding tax, and transfer pricing rules for foreign companies operating in Türkiye in 2025–2026.
What Is GIB (Gelir İdaresi Başkanlığı)?
The Gelir İdaresi Başkanlığı (GIB) in English, Revenue Administration — is Türkiye’s central tax authority, operating under the Ministry of Treasury and Finance. GIB is responsible for administering, collecting, and enforcing all major tax obligations for companies and individuals across the country.
GIB’s Core Responsibilities:
| Tax/Compliance Area | GIB’s Role |
|---|---|
| Corporate Income Tax (Kurumlar Vergisi) | Administers 25% corporate tax rate, filings, and audits |
| Value Added Tax (KDV / VAT) | Manages 20% standard VAT rate and reduced rates |
| Withholding Tax (Stopaj) | Collects tax on dividends, royalties, salaries, and services |
| e-Invoice (e-Fatura) | Mandates and monitors electronic invoicing compliance |
| e-Archive (e-Arşiv) | Oversees digital invoice archiving requirements |
| Tax Registration | Issues Tax Identification Numbers (VKN) and registers companies |
| Tax Audits & Enforcement | Conducts audits, imposes penalties, and enforces compliance |
| International Tax Cooperation | Manages DTAA agreements and transfer pricing rules |
Every company operating in Türkiye whether a Limited Şirketi (Ltd. Şti.), Anonim Şirketi (A.Ş.), branch office, or liaison office must register with GIB within the first month of operations. Failure to register triggers automatic penalties and back-dated tax obligations.
Tax Registration: Your First Compliance Step (VKN)
Before filing a single return or issuing your first invoice, your company must obtain a Tax Identification Number from the local Tax Office.
What Is VKN?
VKN (Vergi Kimlik Numarası) Tax Identification Number is your company’s unique 10-digit tax ID in Türkiye. It functions like a company’s Social Security Number for all tax purposes.
Why VKN is Critical:
- Required for all tax filings (VAT, corporate tax, withholding tax)
- Mandatory for opening corporate bank accounts
- Required on all invoices (e-Fatura or paper)
- Necessary for customs declarations and import/export
- Used in all GIB portal interactions
Documents Required for VKN Registration:
| Document | Description |
|---|---|
| Trade Registry Certificate | Ticaret Sicil Gazetesi (official company registration gazette) |
| Articles of Association | Ana Sözleşme (company charter, translated to Turkish if needed) |
| Signature Circulars | Imza Sirküleri (authorized signatories’ signature specimens) |
| Proof of Business Address | Lease agreement (Kira Sözleşmesi) or property ownership document |
| Shareholder/Director IDs | Passport copies of all shareholders and directors |
| Company OGRN/EGRUL Equivalent | OGRN (Otomatik Sicil Kayıt Numarası) from Trade Registry |
VKN Registration Process:
- Visit Local Tax Office (Vergi Dairesi) Based on your company’s registered address
- Submit Required Documents Original + copies of all documents
- Fill Application Form VKN registration application (provided at office)
- Receive VKN Certificate Typically issued same day or within 1–2 business days
- Register for e-Government Gateway (e-Devlet) Link VKN to digital identity
Timeline: 1–2 business days for standard registration
Cost: Free (no government fee for VKN registration)
Important: Once VKN is issued, your company is officially recognized by GIB and the compliance clock starts ticking. All filing deadlines begin from this date.
Corporate Income Tax (Kurumlar Vergisi): Complete 2025–2026 Guide
Corporate Tax Rate in Türkiye (2025–2026): 25%
In 2025, Türkiye raised its standard corporate income tax rate from 20% to 25%. This rate applies to all resident companies and permanent establishments of foreign companies.
Tax Base: Net profit after allowable deductions (revenue minus expenses)
Corporate Tax Filing Requirements
| Obligation | Frequency | Deadline | Notes |
|---|---|---|---|
| Advance (Provisional) Tax Return | Quarterly | End of month following the quarter | Q1: April 17, Q2: July 17, Q3: October 17, Q4: January 17 |
| Annual Corporate Tax Return | Annually | April 30 (for calendar-year companies) | Must reconcile with quarterly payments |
| Transfer Pricing Documentation | Annually | With annual return | Required if related-party transactions exist |
| Country-by-Country Report (CbCR) | Annually | With annual return | If consolidated group revenue > EUR 750M |
Advance Tax (Provisional Tax) Payments
Companies must pay corporate tax quarterly in advance, based on estimated annual profits.
Payment Schedule:
| Quarter | Period | Payment Deadline |
|---|---|---|
| Q1 | January–March | April 17 |
| Q2 | April–June | July 17 |
| Q3 | July–September | October 17 |
| Q4 | October–December | January 17 (next year) |
Calculation:
Quarterly Payment=4Estimated Annual Profit×25%
Example:
- Estimated annual profit: TRY 10,000,000
- Annual tax: TRY 10,000,000 × 25% = TRY 2,500,000
- Quarterly payment: TRY 2,500,000 ÷ 4 = TRY 625,000
Important: Underpayment triggers interest charges (MCİ rate, currently ~2.5% per month). Overpayment can be refunded or credited to future periods.
Annual Corporate Tax Return
Form: Kurumlar Vergisi Beyannamesi
Deadline: April 30 for calendar-year companies (January 1 – December 31)
Filing Method: Electronically via GIB’s İnteraktif Vergi Dairesi portal
What’s Included:
- Total revenue for the year
- All allowable expenses (salaries, rent, utilities, depreciation, etc.)
- Net profit calculation
- Quarterly advance payments already made
- Final tax liability (or refund amount)
- Transfer pricing disclosures (if applicable)
Penalty for Late Filing: 2–5% of tax due per month + interest
Teknopark (Technology Development Zone) Tax Exemption
One of Türkiye’s most valuable incentives for tech companies: 0% corporate income tax on qualifying R&D and software development income.
Teknopark Benefits
| Benefit | Detail |
|---|---|
| Corporate Tax Exemption | 0% on qualifying R&D/software income (through 2028) |
| VAT Exemption | On qualifying tech services and software sales |
| SGK Support | Government pays employer’s 20% social security contribution for 5 years |
| Customs Duty Exemption | On machinery/equipment imports for R&D |
| Rent Subsidy | Up to 50% rent reduction in Teknopark facilities |
Eligibility Criteria
| Requirement | Detail |
|---|---|
| Business Type | Software development, R&D, technology innovation |
| Location | Must operate within approved Teknopark (40+ zones in Türkiye) |
| Employee Qualification | Minimum 70% of staff must hold university degrees in tech fields |
| Revenue Source | At least 50% of revenue from qualifying tech activities |
How to Access Teknopark
- Apply to Teknopark Management with business plan and R&D project description
- Get approval (evaluation takes 30–60 days)
- Sign lease agreement within approved Teknopark facility
- Notify Tax Office of Teknopark status for tax exemption
- Maintain documentation for audits
Popular Teknoparks:
- İTÜ Çekmece (Istanbul Technical University)
- ODTÜ Teknokent (Middle East Technical University, Ankara)
- Bilkent CYBERPARK (Ankara)
- Ege Teknokent (Izmir)
Real Impact: For a tech company with TRY 5,000,000 profit in Teknopark:
- Without Teknopark: TRY 5,000,000 × 25% = TRY 1,250,000 tax
- With Teknopark: TRY 0 tax on qualifying income
- Savings: TRY 1,250,000 annually
VAT (KDV) Compliance: Complete Guide
Türkiye’s Value Added Tax (Katma Değer Vergisi / KDV) applies to most goods and services. The system is similar to EU VAT models.
VAT Rates in Türkiye (2025–2026)
| Rate | Applies To |
|---|---|
| 20% | Standard goods and services (most products, consulting, trading) |
| 10% | Clothing, footwear, some food products, restaurant services |
| 8% | Books, newspapers, some medicines, cultural events |
| 1% | Basic food items (bread, milk, vegetables, grains) |
VAT Calculation
VAT Payable=Output VAT−Input VAT
Example:
- Sales (output): TRY 100,000 + TRY 20,000 VAT (20%) = TRY 120,000
- Purchases (input): TRY 60,000 + TRY 12,000 VAT (20%) = TRY 72,000
- VAT Payable: TRY 20,000 − TRY 12,000 = TRY 8,000
Monthly VAT Return Filing
| Requirement | Detail |
|---|---|
| Frequency | Monthly (for most companies) |
| Deadline | 28th of the following month |
| Filing Method | Electronically via GIB’s İnteraktif Vergi Dairesi portal |
| Payment | Same deadline as filing (28th) |
| Nil Returns | Must still file even if no transactions |
Input VAT Offset:
- Input VAT (VAT on purchases) can be offset against Output VAT (VAT on sales)
- Excess input VAT can be carried forward to future periods or refunded
VAT Registration Threshold
- Mandatory registration: Annual revenue exceeding TRY 800,000 (2025)
- Voluntary registration: Companies below threshold can register voluntarily
Digital Services VAT (Foreign Companies)
Foreign companies providing digital services to Turkish consumers must register for VAT under the digital services tax regime, even without physical presence in Türkiye.
Examples:
- SaaS companies selling to Turkish customers
- Streaming services (Netflix, Spotify)
- App stores and digital marketplaces
- Online advertising services
VAT Rate: 20% on all digital services sold to Turkish consumers
Filing: Monthly VAT return via GIB portal
e-Invoice (e-Fatura) and e-Archive (e-Arşiv) Mandates
One of the most critical GIB compliance requirements is electronic invoicing. Since 2020, mandates have expanded significantly, and non-compliance triggers severe penalties.
Who Must Use e-Fatura?
Mandatory e-Fatura for:
| Criteria | Detail |
|---|---|
| Annual Turnover | Exceeding TRY 3 million (2025 threshold) |
| Specific Sectors | E-commerce, healthcare, logistics, manufacturing, telecommunications |
| B2B Transactions | All companies transacting with other e-Fatura registered entities |
| Government Contracts | All companies selling to Turkish government entities |
e-Fatura is mandatory regardless of turnover if:
- You issue invoices to other e-Fatura registered companies
- You operate in a mandated sector (e-commerce, healthcare, etc.)
e-Arşiv (e-Archive) For Companies Not on e-Fatura:
Mandatory e-Arşiv for:
- Companies not yet on e-Fatura issuing invoices to consumers above TRY 30,000
- All B2C transactions above TRY 30,000 must use e-Arşiv
e-Arşiv Requirements:
- Invoices must be generated through GIB’s e-Arşiv portal or certified integration
- All invoices must be archived digitally for 10 years
- Invoices must include GIB’s unique e-Arşiv reference number
Integration Options for e-Fatura/e-Arşiv
| Option | Best For | Cost | Pros/Cons |
|---|---|---|---|
| Direct GIB Portal | Low-volume businesses (<100 invoices/month) | Free | Free but manual; suitable for startups |
| Private Integration (Özel Entegratör) | Medium-volume businesses | TRY 500–3,000/month | Certified providers: Logo, Paraşüt, e-Logo, Netaş |
| API Integration | High-volume businesses (>1,000 invoices/month) | Custom pricing | Fully automated; integrates with ERP/accounting software |
Certified Private Integrators:
- Logo Yazılım Popular accounting software with e-Fatura integration
- Paraşüt Cloud-based accounting for SMEs
- e-Logo Dedicated e-invoicing provider
- Netaş Large-enterprise integration solutions
e-Invoice Compliance Penalties
| Violation | Penalty |
|---|---|
| Failure to issue e-Fatura when mandated | TRY 10,000+ per invoice |
| Late submission to GIB | TRY 5,000–10,000 per violation |
| Incorrect/incomplete e-Fatura | TRY 5,000 per invoice |
| Failure to archive for 10 years | TRY 10,000+ per audit finding |
Total Penalty Risk: For a company issuing 100 non-compliant invoices: TRY 1,000,000+ in penalties
Best Practice: Enroll in e-Fatura immediately upon reaching TRY 3M turnover threshold or entering mandated sector.
Withholding Tax (Stopaj) Obligations
Withholding tax applies to specific payments made by Türkiye-registered entities to individuals or companies. The payer must withhold tax and remit it to GIB.
Withholding Tax Rates (2025–2026)
| Payment Type | Withholding Rate | Notes |
|---|---|---|
| Salaries | 15%–40% (progressive) | Based on income bracket |
| Dividends to Foreign Shareholders | 10% | Reduced from 15% under DTAA for India/Pakistan |
| Royalties to Non-Residents | 20% | Can be reduced to 10% under DTAA |
| Professional Services to Non-Residents | 20% | Consulting, legal, accounting services |
| Office Rent | 20% | Commercial property rent |
| Interest Payments | 10%–15% | Depends on lender type |
| Insurance Premiums | 5%–10% | Varies by insurance type |
Withholding Tax Filing (Muhtasar Beyanname)
| Requirement | Detail |
|---|---|
| Form Name | Muhtasar Beyanname (Withholding Tax Declaration) |
| Frequency | Monthly |
| Deadline | 26th of the following month |
| Filing Method | Electronically via GIB İnteraktif Vergi Dairesi portal |
| Payment | Same deadline as filing (26th) |
What to Include:
- Total salaries paid and tax withheld
- Dividends paid and tax withheld
- Royalties paid and tax withheld
- Service fees paid to non-residents and tax withheld
- Rent payments and tax withheld
Penalty for Late Filing: 2–5% of tax due per month + interest
DTAA Benefits for India/Pakistan Companies
The Double Taxation Avoidance Agreement (DTAA) between India-Türkiye and Pakistan-Türkiye reduces withholding taxes:
| Payment Type | Standard Rate | DTAA Rate (India/Pakistan) |
|---|---|---|
| Dividends | 15% | 10% |
| Royalties | 20% | 10% |
| Interest | 20% | 10–15% |
How to Claim DTAA:
- Obtain Tax Resident Certificate from Indian/Pakistani tax authorities
- Submit to Turkish Tax Office with payment request
- Turkish payer applies reduced DTAA rate
- Maintain documentation for audits
Important: DTAA must be claimed at time of payment; cannot be refunded later.
Transfer Pricing Rules for Related-Party Transactions
If your Türkiye entity transacts with related parties abroad (parent company, subsidiaries, affiliates), Türkiye’s transfer pricing rules under Article 13 of the Corporate Tax Law apply strictly.
Transfer Pricing Requirements
| Requirement | Detail |
|---|---|
| Arm’s Length Pricing | Transactions must be priced as if between unrelated parties |
| Annual Documentation | Must maintain detailed transfer pricing documentation |
| Local File | Detailed analysis of related-party transactions |
| Master File | Group-wide transfer pricing policy |
| Country-by-Country Report (CbCR) | If consolidated group revenue > EUR 750 million |
What Counts as Related-Party Transaction?
- Sales/purchases of goods between parent and subsidiary
- Service fees (management, consulting, IT support)
- Royalty payments for IP/license usage
- Interest on intercompany loans
- Rent for property leased from related party
Transfer Pricing Documentation Requirements
| Document | Content |
|---|---|
| Local File | Detailed analysis of each related-party transaction, comparability analysis, pricing methodology |
| Master File | Group organizational structure, global business operations, transfer pricing policies |
| CbCR | Revenue, profit, tax, and economic activity by country for multinational groups |
Penalty for Non-Compliance:
- Tax adjustment: GIB can adjust prices to arm’s length, increasing taxable income
- Penalty: 50% of additional tax due
- Interest: MCİ rate (~2.5% per month) on underpaid tax
Best Practice: Engage transfer pricing specialist annually to prepare documentation, especially for companies with significant related-party transactions.
Social Security (SGK) Compliance
While managed separately from GIB by Sosyal Güvenlik Kurumu (SGK), social security compliance is tightly linked to tax obligations.
SGK Contribution Rates (2025–2026)
| Party | Rate | Base |
|---|---|---|
| Employer | 20–22.5% | Gross salary |
| Employee | 14–15% | Gross salary |
| Total | 34–37.5% | Gross salary |
Breakdown:
| Component | Employer | Employee |
|---|---|---|
| Pension | 11% | 9% |
| Health Insurance | 5% | 3.75% |
| Unemployment | 2% | 1% |
| Work Injury | 0.5–2% | 0% |
| Total | 20–22.5% | 14–15% |
SGK Filing & Payment
| Requirement | Frequency | Deadline |
|---|---|---|
| Employee Registration | Before employment starts | Prior to first work day |
| SGK Return | Monthly | 4th of following month |
| SGK Payment | Monthly | 4th of following month |
Penalty for Late Filing: 2–5% per month + interest
SGK Incentives for Foreign Companies
| Incentive | Benefit | Eligibility |
|---|---|---|
| Teknopark | Govt pays 20% employer SGK for 5 years | Tech companies in Teknopark |
| Investment Incentive Certificate | Govt pays 50% employer SGK for 3–5 years | TRY 500K+ investment, manufacturing |
| Regional Incentive | Govt pays employer SGK | Eastern/Southeastern Turkey |
| Youth Employment | Reduced SGK for hiring under 29 | First-time employees |
Common GIB Compliance Mistakes Foreign Companies Make
Late VKN Registration
Problem: Delaying Tax ID registration triggers back-dated tax obligations and penalties.
Solution: Register for VKN within 1 month of company registration. Start compliance clock immediately.
Not Enrolling in e-Fatura When Thresholds Crossed
Problem:Companies exceeding TRY 3M turnover fail to enroll in e-Fatura, triggering TRY 10,000+ per invoice penalties.
Solution: Monitor turnover monthly. Enroll immediately upon reaching threshold. Use private integrator for ease.
Missing VAT Returns Even Nil Returns
Problem: Companies assume no activity = no filing. GIB requires monthly VAT returns even with zero transactions.
Solution: File nil returns every month. Use CPA or accounting software to automate filings.
Incorrect Withholding Tax Categories
Problem:Misclassifying software licensing fees, consulting services, or royalty payments leads to incorrect withholding rates.
Solution: Work with tax advisor to correctly classify payments. Apply DTAA rates when eligible.
Ignoring Provisional Tax Installments
Problem:Foreign-owned entities often overlook quarterly advance tax payments, accumulating interest charges.
Solution: Set quarterly reminders (April 17, July 17, October 17, January 17). Estimate annual profit and pay quarterly.
Failing to Maintain Transfer Pricing Documentation
Problem: Companies with related-party transactions skip transfer pricing documentation, risking 50% penalty on adjusted taxes.
Solution: Engage transfer pricing specialist annually. Prepare local file, master file, and CbCR if applicable.
Not Archiving e-Invoices for 10 Years
Problem: Companies delete e-invoices after filing. GIB requires 10-year digital archiving.
Solution: Use certified e-invoice provider with automatic archiving. Maintain backup copies.
GIB Contact Information
| Contact Method | Details |
|---|---|
| Helpline | 444 0 189 (Türkiye-wide, 24/7) |
| ibk@gib.gov.tr | |
| Headquarters | Ankara, Türkiye |
| Regional Offices | Available in all 81 provinces |
Working with a Yeminli Mali Müşavir (YMM) Certified Public Accountant
For foreign companies, working with a licensed Yeminli Mali Müşavir (YMM) Türkiye’s equivalent of Certified Public Accountant (CPA) is highly recommended and often essential for compliance.
Why You Need a YMM
| Service | Benefit |
|---|---|
| Monthly VAT Filings | Ensures timely, accurate filings; prevents penalties |
| Quarterly Corporate Tax | Calculates provisional payments correctly |
| Annual Corporate Tax Return | Prepares and files annual return by April 30 deadline |
| e-Fatura/e-Arşiv Setup | Registers company, selects integrator, trains staff |
| Withholding Tax Compliance | Correctly classifies payments, applies DTAA rates |
| Transfer Pricing Documentation | Prepares local file, master file, CbCR |
| SGK Registration & Filings | Registers employees, files monthly returns |
| Audit Support | Represents company during GIB audits; negotiates penalties |
| Tax Planning | Identifies incentives (Teknopark, investment certificate) |
YMM Costs (2025–2026)
| Service | Annual Cost (TRY) | Annual Cost (USD) |
|---|---|---|
| Basic Compliance (VAT, SGK, monthly filings) | 30,000–60,000 | $1,000–$2,000 |
| Full-Service (All taxes + annual return + e-Fatura) | 60,000–120,000 | $2,000–$4,000 |
| Transfer Pricing Documentation | 40,000–100,000 | $1,300–$3,300 |
| Teknopark Application + Management | 20,000–50,000 | $660–$1,650 |
| Audit Representation | 50,000–150,000 | $1,650–$5,000 |
Investment: TRY 60,000–120,000/year for comprehensive compliance support
ROI: Avoids penalties (TRY 10,000+ per violation), identifies tax savings (Teknopark = 0% CIT), prevents deregistration
Recommended YMM Firms for Foreign Investors
- Oznur & Partners Investment-focused tax advisory
- PILC Law Corporate tax & international tax specialists
- Workon Turkey Foreign company setup & compliance
- Big 4 Türkiye Offices (Deloitte, PwC, EY, KPMG) For large investments
GIB Compliance Calendar for Foreign Companies (2025–2026)
| Month | Obligation | Deadline |
|---|---|---|
| January | Q4 Advance Corporate Tax Payment | January 17 |
| January | December VAT Return | January 28 |
| January | December Withholding Tax (Muhtasar) | January 26 |
| January | December SGK Return | January 4 |
| February | — | — |
| March | — | — |
| April | Q1 Advance Corporate Tax Payment | April 17 |
| April | March VAT Return | April 28 |
| April | Annual Corporate Tax Return (Prior Year) | April 30 |
| April | March Withholding Tax | April 26 |
| April | March SGK Return | April 4 |
| May | — | — |
| June | — | — |
| July | Q2 Advance Corporate Tax Payment | July 17 |
| July | June VAT Return | July 28 |
| July | June Withholding Tax | July 26 |
| July | June SGK Return | July 4 |
| August | — | — |
| September | — | — |
| October | Q3 Advance Corporate Tax Payment | October 17 |
| October | September VAT Return | October 28 |
| October | September Withholding Tax | October 26 |
| October | September SGK Return | October 4 |
| November | — | — |
| December | — | — |
| January | Q4 Advance Corporate Tax Payment | January 17 (Next Year) |
| January | December VAT Return | January 28 (Next Year) |
Critical: Set calendar reminders 3–5 days before each deadline. Late filings compound quickly.
Final Checklist: GIB Compliance for Foreign Companies in Türkiye
✅ Obtain VKN (Tax ID) within 1 month of company registration
✅ Register for e-Devlet (e-Government Gateway) with e-Signature
✅ Enroll in e-Fatura if turnover >TRY 3M or in mandated sector
✅ Set up Private Integration (Özel Entegratör) for e-Fatura (Logo, Paraşüt)
✅ File monthly VAT returns by 28th (even nil returns)
✅ File quarterly advance corporate tax by 17th of following month
✅ File annual corporate tax return by April 30
✅ File monthly withholding tax (Muhtasar) by 26th
✅ File monthly SGK returns by 4th of following month
✅ Maintain transfer pricing documentation if related-party transactions exist
✅ Archive all e-invoices digitally for 10 years
✅ Apply for Teknopark status if eligible (0% CIT on R&D income)
✅ Claim DTAA benefits for dividends, royalties, interest (10% withholding)
✅ Hire licensed Yeminli Mali Müşavir (YMM) for ongoing compliance