Entity Setup

Entity Structuring in Light of OECD’s STTR and Global Minimum Tax: What Entities Should Know

Global minimum tax and the Subject to Tax Rule (STTR) reshape how entities are taxed internationally—this article explains risks, benefits, and strategic responses.

By NomadicTax Research Team • 5-8 min read • September 1, 2026

## OECD’s Two-Pillar Solution and STTR explained The OECD/G20 Inclusive Framework adopted a **global minimum tax** (Pillar Two) and under it the **Subject to Tax Rule (STTR)**, a treaty-based rule enabling source countries to impose additional withholding tax when related-party payments are taxed below the minimum rate in recipient countries. ([oecd.org](https://www.oecd.org/en/topics/sub-issues/subject-to-tax-rule.html?utm_source=openai)) The STTR works through a *Multilateral Instrument* (STTR MLI) that lets jurisdictions amend their bilateral treaties to implement this rule. ([oecd.org](https://www.oecd.org/en/topics/sub-issues/subject-to-tax-rule.html?utm_source=openai)) ## Who is impacted and how - **Multinational entities (MNEs)**: Especially those with low-tax subsidiaries receiving inter-company payments (interest, royalties) may face **withholding tax increases** from payors subject to STTR. - **Jurisdictions**: Countries in the OECD Inclusive Framework need to ratify/adopt STTR; for entities operating in treaty countries, the implementation status of STTR MLIs matters. - **Investors/holding companies**: If the recipient jurisdiction’s nominal tax rate falls below the agreed minimum, the payor jurisdiction (source) may impose a tax ‘top-up’ via STTR. ## Strategic Entity Setup in light of STTR ### 1. **Evaluate current treaty network and tax rates** - Map where each entity sits, its local corporate tax rate, and whether the treaties with source jurisdictions have signed or ratified the STTR MLI. - Where STTR is in force, assess whether inter-company payments will be taxed below the minimum; adjust financing, royalty flows accordingly. ### 2. **Choose jurisdictions with compliant tax regimes** - Jurisdictions with sufficient corporate tax rates (equal or above the minimum) minimize risk. - Or consider structuring payment flows through intermediary jurisdictions that have STTR-compliant treaties or can use the grandfathering provisions. ### 3. **Restructure inter-company payments** - Finance through equity rather than debt to reduce interest/royalty payments if they will be subject to STTR. - Use service agreements with arm’s length pricing; keep documentation and substance to avoid treaty abuse rules (Action 6 under BEPS). ## Monitoring OECD developments and policy changes The STTR is a **living policy area**: some jurisdictions have already signed or ratified the STTR MLI; others are still evaluating. It’s critical to monitor treaty status updates on **OECD’s Subject to Tax Rule page**. ([oecd.org](https://www.oecd.org/en/topics/sub-issues/subject-to-tax-rule.html?utm_source=openai)) Also, the *OECD Model Tax Convention* has been updated in 2025 with clarifications relevant to residence, definitions of pension funds, and revisions to tie-breaker rules. ([oecd.org](https://www.oecd.org/content/dam/oecd/en/publications/reports/2025/11/the-2025-update-to-the-oecd-model-tax-convention_c7031e1b/5798080f-en.pdf?utm_source=openai)) ## Example scenarios and cautionary planning Imagine a parent company in **Country A** (nominal corporate tax rate 15%) paying royalties to a subsidiary in **Country B** with a nominal rate of 5%. If STTR is active between the two, Country A may impose withholding at STTR rate, or require upwards tax adjustments. Alternatively, for foreign-owned service centers or regional headquarters operating in low-tax jurisdictions, one may explore converting them to branches taxed in higher-rate jurisdictions or absorb their profits via cost-sharing/service fees from related entities in high tax areas. Substance matters: does the entity have offices, staff, assets? OECD BEPS rules punish hollow entities. ## Actionable Steps for Entities - Conduct a **tax treaty audit**: List treaties, mark which have signed STTR MLI, see effective dates. - Review **inter-company payment policies**: Interest, royalties, service charges — especially where recipient country has low or zero tax. - Ensure **organizational substance** in low tax jurisdictions: staff, offices, decision-making power. - Educate finance, legal teams: STTR may require reporting and withholding obligations. - Liaise with advisers globally: US, EU, UK, are adjusting rules; treaties may be renegotiated. ## Looking ahead: other OECD work streams Besides STTR/Pillar Two, note: - **BEPS Multilateral Instrument (BEPS MLI)**: Already in force in many jurisdictions to implement treaty abuse rules and other BEPS minimum standards. ([oecd.org](https://www.oecd.org/en/topics/tax-treaties.html?utm_source=openai)) - **Enhanced transparency & exchange of information on request**: OECD’s Global Forum monitors compliance; delays or rejections can carry reputational risk. ([oecd.org](https://www.oecd.org/content/dam/oecd/en/publications/reports/2026/06/enhanced-monitoring-report-on-the-implementation-of-the-standard-on-transparency-and-exchange-of-information-on-request-2026-update-june_959f4b86/9ef50941-en.pdf?utm_source=openai)) - **Model Tax Convention updates**: The 2025 update includes clarifications on residence, pensions, hybrid mismatch avoidance. ([oecd.org](https://www.oecd.org/content/dam/oecd/en/publications/reports/2025/11/the-2025-update-to-the-oecd-model-tax-convention_c7031e1b/5798080f-en.pdf?utm_source=openai)) ## Summary Entities operating internationally must adapt to **global minimum tax regimes and STTR**. To minimise burden and tax exposure, structure payments carefully, choose jurisdictions wisely, ensure compliance with treaty status, and build substance. As OECD’s work continues, stay updated—what’s current today may shift as more countries ratify STTR and adopt by treaty.