Thin Capitalisation in Turkey for Foreign Shareholder Loans: Corporate Tax Article 12 and the 3x Equity Rule
Thin Capitalisation in Turkey: Thin capitalisation in Turkey under Corporate Tax Law Article 12: the 3x equity rule, foreign shareholder loans, related-party debt, non-deductible interest and deemed dividend consequences.
Corporate Tax Law No. 5520 Article 12 treats the portion of debt obtained directly or indirectly from shareholders or shareholder-related persons and used in the business as thin capitalisation when the aggregate related-party debt exceeds three times the company’s equity at any time during the accounting period. The excess portion is treated as thin capital for the period. Interest, foreign-exchange losses and similar financing expenses attributable to thin capital are not deductible under Corporate Tax Law Article 11; interest and similar amounts, excluding exchange differences for the deemed-distribution rule, are treated at year end as distributed dividends or, for a limited taxpayer branch, as amounts transferred to head office. A foreign shareholder loan can therefore create three separate tests: debt/equity under Article 12, arm’s-length interest under Article 13 and withholding/treaty consequences.
Thin-capitalisation decision map
| Question | Article 12 rule | Practical consequence |
|---|---|---|
| Who supplied the debt? | Shareholder or shareholder-related person, directly or indirectly | Map ownership and financing chain. |
| How much debt? | Compare qualifying related-party debt with 3x beginning-of-period equity | Only the excess portion becomes thin capital. |
| When is threshold tested? | If exceeded at any time in accounting period | Daily/periodic funding peaks matter. |
| Interest consequence | Interest and similar expenses on thin-capital portion non-deductible | Corporate taxable income increases. |
| Secondary tax consequence | Interest/similar amounts deemed dividend at year end | Withholding and treaty analysis can arise. |
1. Article 12 is a debt/equity rule, not a prohibition on shareholder loans
A foreign shareholder can finance a Turkish company through debt. Turkish tax law does not automatically reclassify every shareholder loan as equity. Article 12 instead sets a quantitative and relational test.
The debt must come directly or indirectly from a shareholder or a person related to the shareholder, be used in the business and exceed the statutory debt/equity limit.
Only the portion exceeding the threshold is treated as thin capital.
2. Lender identity must be mapped through ownership and related-party links
A direct parent-company loan is the simplest example. The rule can also apply where financing comes from a sister company, another group entity or a person related to the shareholder under the statutory definition.
The financing chain should therefore be analysed economically and legally rather than only from the name on the bank transfer.
Back-to-back and guaranteed arrangements can require additional review.
3. Indirect financing can fall within Article 12
Article 12 expressly refers to debt obtained directly or indirectly. A foreign shareholder cannot necessarily avoid thin-capitalisation analysis by routing funds through another group company.
The actual funding source, guarantees, reimbursement obligations and group cash-pool arrangements should be documented.
Independent bank borrowing remains a different category, subject to the law’s specific related-party/intermediation rules.
4. The comparison uses equity at the beginning of the accounting period
The current General Communiqué explains that related-party debt is compared with three times the company’s beginning-of-period equity for the accounting period.
Weak opening equity can therefore create thin-capital risk even where the company becomes profitable later in the year.
Capital planning should be performed before major group funding is drawn.
5. Only the amount above three times equity is thin capital
If qualifying related-party debt does not exceed three times beginning equity, the quantitative thin-capital threshold is not crossed.
If it exceeds the threshold, the excess amount is treated as thin capital for the period in which the conditions exist.
The threshold should be calculated from all relevant related-party debt together rather than testing each loan in isolation.
6. Exceeding the limit at any time during the year matters
Article 12 looks to whether the qualifying debt exceeds the threshold at any time in the accounting period. A temporary funding spike can therefore create thin-capital consequences even if year-end debt is below the limit.
Treasury teams should monitor daily or periodic balances during acquisitions, dividend funding and seasonal working-capital peaks.
A year-end snapshot alone can miss the statutory breach.
7. Foreign-currency debt requires exchange-rate discipline
The current General Communiqué states that foreign-currency debt is translated using the exchange rate at the date the borrowing is obtained for the debt/equity calculation. Where the maturity extends into the following year, the unpaid balance is revalued for the new-year analysis under Tax Procedure Law principles.
Currency volatility can materially affect both financing expenses and the Turkish tax computation.
Loan schedules should retain drawdown dates and exchange-rate data.
8. Financing through banks and finance companies has special rules
The statute and Communiqué contain specific treatment for loans obtained from banks/financial institutions and passed through to the company under certain conditions. Some such debt is considered at 50% for thin-capital purposes, while qualifying independent financing can fall outside ordinary shareholder-debt treatment.
The exact financing chain and lender status should be reviewed rather than applying the three-times rule mechanically.
A shareholder guarantee does not necessarily make every independent bank loan shareholder debt, but substance matters.
9. Financing expenses attributable to thin capital are not deductible
Corporate Tax Law Article 11 prevents deduction of interest, exchange differences and similar expenses attributable to thin capital for corporate income-tax purposes.
The accounting expense can remain in the books but is added back in the taxable-income calculation.
The allocation should be calculated only for the thin-capital portion and relevant period.
10. Interest and similar payments can be treated as distributed dividends
Article 12(7) treats interest and similar amounts on thin capital, excluding exchange differences for this secondary characterisation, as distributed dividends at the end of the accounting period for income/corporate tax purposes.
This creates a second tax layer beyond deductibility.
For a limited taxpayer branch, the amount can be treated as transferred to head office under the statutory rule.
11. Deemed dividend treatment can create withholding and treaty issues
Once a payment is deemed a dividend, the applicable domestic withholding and tax treaty should be reviewed.
The original payment may have been labelled interest, but Turkish tax law can recharacterise it for the thin-capital portion.
Residence certificates and beneficial-owner analysis can therefore become relevant after the Article 12 adjustment.
12. Thin capitalisation and transfer pricing are separate tests
A loan may stay below the three-times equity threshold but still carry a non-arm’s-length interest rate. Conversely, an arm’s-length interest rate does not protect excessive debt from Article 12.
Our transfer-pricing guide explains the Article 13 pricing layer.
Both analyses should be completed before a foreign shareholder loan is funded.
13. Equity financing changes the tax and corporate-law profile
A capital contribution is not debt and does not generate interest deductions. It strengthens equity and can reduce the risk that future shareholder borrowing exceeds the thin-cap threshold.
However, capital increases require Turkish corporate formalities and can affect shareholder rights.
Debt and equity should therefore be selected based on commercial, tax, currency and governance considerations together.
14. Group cash pools require tracing
Multinational groups often centralise cash through a treasury company. A Turkish subsidiary drawing from the pool should identify the legal lender, funding source, interest method and guarantees.
Cash-pool balances can move rapidly and cause temporary threshold breaches.
The treasury policy should be reconciled with Turkish related-party documentation.
15. Guarantees can affect the substance of financing
A loan formally granted by an external lender but economically supported by a shareholder guarantee requires careful statutory analysis.
The law contains specific provisions for indirect debt and certain bank finance structures. The correct result depends on how the funds and risk are arranged.
Guarantee fees themselves can also require transfer-pricing review.
16. A defensible loan file needs more than the signed agreement
Keep board/shareholder approvals, loan contracts, drawdown and repayment records, opening equity, daily balances, exchange rates, interest benchmarking, lender ownership information and withholding records.
The debt/equity calculation should be reproducible from the accounting ledger.
Related-party financing documentation should be prepared contemporaneously.
17. Fixing an excessive debt structure requires tax-aware execution
Repayment, debt-to-equity conversion, new capital and refinancing can reduce future thin-cap risk, but the restructuring itself can create corporate, foreign-exchange, withholding and accounting consequences.
An adjustment made only after a tax audit begins cannot erase prior-year thin-cap results.
Bakırcı & Keskin Hukuk Bürosu has one physical office in Mersin. Corporate and tax disputes elsewhere in Türkiye can be coordinated from Mersin subject to competent tax authorities and courts.
Conclusion
Foreign shareholder debt is lawful, but Article 12 imposes a quantitative debt/equity discipline. Related-party debt above three times beginning equity can become thin capital, causing non-deductible financing costs and deemed-dividend consequences. The funding should be tested under Articles 12 and 13 before drawdown.
Frequently asked questions
What is the basic thin-capital ratio in Turkey?
Qualifying related-party debt exceeding three times beginning-of-period equity is treated as thin capital for the excess portion.
Are all shareholder loans prohibited?
No. The law imposes tax consequences when the statutory conditions and threshold are met.
Does the test use year-end debt only?
No. Exceeding the threshold at any time in the accounting period can matter.
Are interest expenses deductible on the thin-cap portion?
No. Interest and similar financing expenses attributable to thin capital are non-deductible.
Are exchange differences also non-deductible?
Article 11 includes exchange differences among non-deductible expenses attributable to thin capital, although the Article 12(7) deemed-dividend characterisation excludes exchange differences.
Can the interest be treated as a dividend?
Yes. Article 12(7) treats interest and similar amounts on thin capital as distributed dividend at year end for tax purposes.
Does an arm’s-length interest rate avoid thin capitalisation?
No. Transfer pricing and thin capitalisation are separate tests.
Does foreign currency change the threshold?
The debt must be translated under the applicable Communiqué rules; currency data should be retained.
Can new equity reduce risk?
Yes prospectively, but the corporate and tax effects of a capital increase should be reviewed.
Can a temporary loan balance create thin capital?
Yes if the threshold is exceeded during the accounting period.
Official sources
Revenue Administration – current Corporate Tax General Communiqué, Thin Capital section
Revenue Administration – Article 12 thin-capital explanation
Source review date: 8 September 2026.
Legal information notice
This publication provides general legal and tax information. Financing structures must be analysed from current accounts, equity, lender relationships and treaty facts.
Mersin office and Türkiye-wide coordination
Bakırcı & Keskin Hukuk Bürosu has one physical office in Mersin. Files throughout Türkiye are coordinated from Mersin subject to competent authority, court and procedural rules.
Contact regarding a legal matter
In your first message, you may briefly state the subject, your country or city, and any relevant notification or recent procedural date. Please do not send identity numbers, medical data, or personal documents. Messaging alone does not constitute legal advice or create a lawyer–client relationship.
