Turkey's QSC/IFC Deduction Meets Pillar Two: QDMTT and SBIE Analysis (2026)

Regulatory note: Updated as of 11 September 2026 using the Turkish minimum top-up tax provisions, Law No. 7582, IFC Law No. 7412, Presidential Decision No. 11511, Tax Procedure Circular No. 203, current Revenue Administration materials and OECD GloBE sources. The QDMTT calculation is jurisdictional and includes multiple adjustments and elections; the examples below are not a tax-return computation. The Turkish domestic list and the OECD Central Record are separate sources and both must be rechecked for a specific transaction.

An eligible qualified service center in the Istanbul Finance Center may deduct 100% of qualifying foreign group-service income from the corporate tax base. If that entity belongs to an in-scope MNE group, the headline rate does not establish the net benefit; Türkiye’s jurisdictional GloBE computation is required.

60-second summary

• QSC income qualifies for a 95% corporate-tax-base deduction, 100% in an eligible IFC case (CITC Art. 10/1-(j), Law 7582); for 20 fiscal years from the period the QSC becomes operational.
• For an in-scope group the deduction may reduce the Turkish jurisdictional GloBE effective rate. The top-up outcome depends on blending, covered taxes, adjustments, elections, safe harbours and SBIE.
• SBIE is an important protection layer based on eligible payroll and tangible assets; “deduction × 15%” is not a final QDMTT computation.
• The real risk is the wrong assumption: thinking “I claimed the deduction, so the group tax analysis is done.”

The Incentive Architecture: Three Separate Doors

First, the ground rules — because the most common field mistake is treating different exemptions as one.

1) IFC financial-services-export exemption (Law 7412). Art. 6 of the Istanbul Finance Center Law deducts 75% of financial-service-export income from the tax base; Provisional Art. 1 raises this to 100% for tax periods 2022-2047. Its basis is the IFC Law — not CITC Art. 10.

2) Qualified service center (QSC) deduction (Law 7582 — new). Law 7582 added subparagraph (j) to CITC Art. 10: for companies operating as a qualified service center under Law No. 4875 on Foreign Direct Investments, 95% of the income earned from abroad in that activity is deducted; for participant-certified IFC QSCs and QSCs in industrial zones approved by the President, the rate is 100%. The deduction runs for 20 fiscal years from when the QSC becomes operational, conditional on the income being transferred to Türkiye by the filing deadline. The corporate-tax deduction applies from 1 January 2026.

The QSC definition was added to Law 4875 by Law 7582: a capital company, serving related companies/the group in at least three different countries, deriving at least 80% of annual revenue from foreign related parties. This definition is no accident; it is itself a “are you a real regional hub, or a shell that issues invoices?” test — and, as we will see, it also decides the entity’s fate under Pillar Two.

3) QSC personnel income-tax exemption. Wages paid to QSC personnel are income-tax-exempt up to three times the gross minimum wage (up to five times in the IFC and in presidentially-approved industrial zones). This relief sits on the income-tax side; it is not the same tax base as the QSC corporate-income deduction. Track the personnel benefit and the GloBE corporate-tax computation separately, then combine them in the total-cost model.

Don’t conflate: The older “service-export” deduction in CITC Art. 10/1-(ğ) (architecture, software, call-center, data storage, education-health; 50% since 2023 via Law 7491) is a SEPARATE regime from the new QSC regime (Art. 10/1-(j), Law 4875). Both are loosely called “service center” incentives, but their basis, rate and conditions differ.

Pillar Two and the QDMTT: Turkey’s Framework

The OECD’s Second Pillar requires multinational groups with EUR 750 million or more in consolidated revenue to be taxed at an effective rate of at least 15% in every jurisdiction. Turkey transposed these rules into Part Five of CITC 5520 via Law 7524: the minimum corporate tax rate is 15%. The threshold is met where the ultimate parent’s consolidated revenue exceeds EUR 750m in at least two of the four fiscal periods preceding the reporting period.

The architecture includes the QDMTT, which computes domestic top-up using Türkiye’s jurisdictional effective rate, and the IIR/UTPR, which affect the ordering across the group’s other jurisdictions. Türkiye’s regime is effective from 1 January 2024. Presidential Decision No. 11511 sets the Turkish domestic safe-harbour and qualified-regime lists. That national decision does not replace the OECD record; the OECD Central Record must also be checked at the transaction date.

If a QDMTT applies and the full Turkish jurisdictional computation produces top-up tax, the agreed rule order may allow Türkiye to collect that tax before an IIR applies elsewhere. The result cannot be inferred from one low-taxed income line; jurisdictional blending, covered taxes, SBIE, safe harbours and transaction-date qualified status must be evaluated together.

The Intersection: How a 100% Deduction Affects the QDMTT Analysis

In a simplified single-entity example, deducting 100% of QSC income may reduce current corporate tax attributable to that income toward zero. The GloBE effective rate is not calculated from that line alone: all Turkish constituent entities, covered/deferred taxes and other adjustments are combined on a jurisdictional basis. The table therefore illustrates why low-taxed income may increase QDMTT exposure; it is not a return computation.

Table 1 — Data bridge required for a QSC QDMTT analysis

Computation note: Neither “deduction × 15%” nor “single-entity current tax / accounting profit” produces the final QDMTT. The result requires all in-scope constituent entities, covered and deferred taxes, adjustments, elections, safe harbours and SBIE.

The SBIE Shield: How Substance Protects the Incentive

One important computation component is the SBIE (substance-based income exclusion). GloBE excludes an amount calculated from eligible payroll and tangible assets in each jurisdiction from the top-up base. The steady-state rate is 5% for each; transitional rates are higher and decline over time. A 2026 illustration uses 9.4% for payroll and 7.4% for tangible assets, subject to the eligible-item definitions.

The SBIE can reduce the excess-profit amount exposed to top-up. More eligible payroll and tangible assets may increase that exclusion, but company data are required before saying how much of the incentive is preserved.

A 4-step substance test for analysing the QSC deduction under the QDMTT

1. Threshold triage: Does the group cross the EUR 750m threshold in at least two of the previous four years? If not, Pillar Two does not arise from that threshold; the QSC deduction’s other domestic tax conditions still require review.
2. Measure payroll: Annual gross payroll of Turkish QSC staff × the year’s rate (2026: 9.4%) → the wage leg of the SBIE.
3. Measure tangible assets: Net book value of Turkish tangible assets × the year’s rate (2026: 7.4%) → the asset leg of the SBIE.
4. Model excess profit: calculate the top-up base from GloBE income, SBIE and all other applicable elements; QSC income minus SBIE is not the final return computation.

One caution: the existence of safe harbours does not remove the need for real operations and complete data. Recheck the period- and jurisdiction-specific conditions for applicable CbCR, QDMTT and other safe harbours in current OECD sources.

The Decision Matrix: Substance QSC vs. Shell QSC

The investor decision reduces, before any location choice, to the level of substance. The same income produces a completely different net benefit depending on substance.

Table 2 — Substance level × net corporate-tax benefit

The message: for an in-scope group, the real value of the QSC/IFC incentive is measured through Türkiye’s full jurisdictional GloBE model, not the headline rate. SBIE is an important input, not the only determinant. The decision requires real operations, group data and the compliance calendar to be considered together.

Gökay GÜL’s note: “We claim the deduction and the tax analysis ends” is an incomplete assumption. Below the threshold, Pillar Two does not arise from that threshold, but the QSC deduction’s other Turkish conditions still apply. Above it, real payroll and tangible assets matter alongside jurisdictional blending, covered taxes, elections and safe harbours. Scope and data first, model second, incentive decision last.

Illustrative Scenario

This is not a real taxpayer case. It is a hypothetical example designed to show the GloBE decision tree.

Assume an in-scope payments-technology group wants to consolidate four regional service teams in an IFC-based QSC and bill group-wide software and operations from Türkiye. Its first draft assumes that the 100% deduction ends the tax analysis.

The first question is who will actually produce the service in Türkiye and with what payroll and tangible assets. A physically thin operation reduces the SBIE and raises potential top-up exposure. The answer is not obtained by applying an approximate 15% to one income figure; it requires the Turkish jurisdictional GloBE computation.

The model therefore starts with scenarios for real payroll and tangible assets, then combines the Law No. 4875 tests, income repatriation and the GloBE documentation/filing calendar. The outcome must be calculated from company data; do not assume that substance automatically reduces the top-up to zero.

Implementation Risks, Filing and Audit Certification

Don’t confuse the filing calendar. For FY2024, the local minimum top-up tax (QDMTT) return was extended by circulars to 28 January 2026. Tax Procedure Circular No. 203 subsequently extended both the FY2024 GloBE Information Return (GIR) and the global minimum top-up-tax return/payment deadline to 31 July 2026. Do not place the general 18-month rule on the compliance calendar without this specific extension.

Audit certification. Top-up computations run alongside the certification and reporting duties under General Communiqué No. 49 on the CPA/Sworn-CPA Law (Official Gazette 30.12.2025, no. 33123). Both the accuracy and the documentability of the computation are open to audit.

A margin of caution. Recheck current Revenue Administration materials, filing guidance, the OECD Central Record and applicable safe harbours for each transaction.

Action List and Sources

1. Today: Determine whether the group is at the EUR 750m threshold — it decides which regime you are in.
2. Before structuring: Model jurisdictional ETR, covered/deferred taxes, safe harbours, elections and SBIE alongside the IFC/QSC deduction.
3. Prioritize substance: Plan real headcount and tangible assets in Turkey; build an operations center, not an invoicing center.
4. Lock the calendar: Preserve official calendar evidence for 31.07.2026 (FY2024 GIR and global return) and 28.01.2026 (domestic return) in the compliance file.
5. Verify status from both sources: Check the Turkish domestic list in Presidential Decision No. 11511 and the OECD Central Record separately for the relevant period.

Official sources

• Corporate Income Tax Law No. 5520 — Legislation Information System
• Law No. 7582 — Official Gazette text published by the Revenue Administration
• Local and Global Minimum Top-up Corporate Tax General Communiqué — Revenue Administration
• Tax Procedure Circular No. 203 announcement — Revenue Administration
• 2026 tax calendar: GIR and global return — Revenue Administration
• Presidential Decision No. 11511 — Official Gazette, 11 July 2026/no. 33307
• General Communiqué No. 49 on the CPA/Sworn-CPA Law — Official Gazette
• OECD Central Record — transitional qualified-status record
• OECD 2026 Consolidated Commentary — SBIE and GloBE rules