Montenegro’s Law on Global Minimum Tax, which entered into force on 10 March 2026, introduces a separate tax framework for the world’s largest multinational and domestic corporate groups while leaving the country’s existing corporate tax model unchanged for most businesses. The legislation maintains Montenegro’s progressive corporate income tax rates of 9%, 12% and 15%, but establishes additional rules for companies belonging to large groups that meet international revenue thresholds. The law was published in the Official Gazette of Montenegro No. 33/2026 and implements the OECD/G20 Pillar Two framework and the European Union’s minimum taxation rules.
New Rules Apply to Groups Above €750 Million Revenue Threshold
The global minimum tax regime applies to constituent entities of multinational or large domestic groups with consolidated revenue of at least €750 million in at least two of the previous four fiscal years. For qualifying groups, the effective tax rate calculated in each jurisdiction is compared with the 15% global minimum tax rate.
If the effective tax rate in a jurisdiction is below the required level, an additional top-up tax may become payable. The rules do not apply to ordinary Montenegrin companies solely because their profits are taxed at the country’s lowest corporate income tax rate of 9%. The determining factor is the consolidated revenue of the entire group.
International Companies in Montenegro Become Main Focus
The framework primarily affects Montenegrin subsidiaries of large international groups operating in sectors such as tourism, banking, telecommunications, energy, retail and industry. The reform is designed to limit the ability of large corporate groups to shift profits into jurisdictions with lower effective taxation and to reduce reliance on low tax rates as a primary investment incentive.
For Montenegro, the mechanism also has a revenue-protection dimension. If income generated in Montenegro is taxed below the global minimum level and Montenegro does not collect the additional tax, another country within the corporate group structure may have the right to collect the difference.
Investment Incentive Models Face New Requirements
The introduction of global minimum taxation changes the impact of certain tax-based investment incentives for companies covered by the regime. Tax holidays, credits or preferential tax arrangements may continue to support companies outside the scope of Pillar Two. For large multinational groups covered by the rules, the benefit may be offset through additional taxation elsewhere in the group structure.
Future investment policies for major international projects will therefore rely more on factors including infrastructure, workforce skills, energy availability, accelerated depreciation, grants compatible with international rules and faster permitting procedures.
Effective Tax Rate Calculation Requires Detailed Data
The calculation under Pillar Two is based on a jurisdictional effective tax rate rather than a direct comparison between Montenegro’s statutory tax rate and the 15% minimum. The methodology uses adjusted accounting income and covered taxes, with factors such as deferred taxes, losses, tax credits, intra-group payments and the location of employees and tangible assets affecting the final calculation. A company paying the standard Montenegrin corporate tax rate does not automatically face a simple additional charge equal to the difference between 9% and 15%.
Companies Face New Administrative Requirements
The immediate impact for covered groups is expected to be largely administrative. Affected companies will need detailed information on their Montenegrin entities, permanent establishments, ownership structures, financial statements, deferred-tax positions and local incentives. Information that previously had limited importance for parent-company tax reporting may now influence jurisdiction-level calculations under the global minimum tax system.
The legislation provides an 18-month deadline after the end of the relevant fiscal year for filing and payment obligations. Non-compliance may result in penalties for entities ranging from €3,000 to €40,000. Companies are required to verify applicable deadlines based on their fiscal year and any transitional measures or safe-harbour provisions.
Montenegro Develops Tax Information Exchange System
Montenegro is also preparing the administrative infrastructure required for implementation of the new framework. In June 2026, the Government approved amendments related to tax administration and the automatic exchange of top-up-tax information under updated EU administrative cooperation rules. The information exchange system is necessary because Pillar Two obligations cannot be managed solely through domestic tax filings.
Limited Immediate Revenue Impact Expected
Montenegro has a limited number of domestically headquartered groups that exceed the €750 million revenue threshold. In addition, some multinational subsidiaries operating in the country may already have effective tax rates close to or above the 15% minimum level.
The main effect of the legislation is therefore expected to be on investment planning, tax modelling and the structure of future incentive policies rather than immediate tax revenue collection. For most businesses operating in Montenegro, the existing 9–15% corporate income tax system remains unchanged. For companies covered by the global minimum tax rules, the relevant calculation will depend on the final effective tax rate of the wider corporate group and the jurisdiction entitled to collect any additional tax.
