Montenegro has spent years presenting its tax system as one of the most competitive in Europe. Its progressive corporate income-tax rates of 9%, 12% and 15% have been central to that proposition. The new Law on Global Minimum Tax, in force since 10 March 2026, does not abandon the model. It creates a separate regime for the world’s largest corporate groups.
The law applies to constituent entities of multinational or large domestic groups whose consolidated revenue reaches at least €750 million in at least two of the previous four fiscal years. For those groups, the effective tax rate in a jurisdiction is tested against a 15% minimum. Where the calculated rate falls below the floor, a top-up tax can arise. The official legislation was published in Montenegro’s Official Gazette 33/2026.
Ordinary Montenegrin businesses are not brought into the regime merely because their profit is taxed at 9%. The threshold is based on consolidated group revenue, meaning the law primarily affects Montenegrin subsidiaries of international hotel groups, banks, telecommunications companies, energy businesses, retailers and industrial corporations.
The reform implements the OECD/G20 Pillar Two architecture and reflects the EU’s minimum-tax directive. Its purpose is to prevent large groups from shifting profit into low-tax jurisdictions and to reduce the incentive for countries to compete exclusively through very low effective corporate taxation.
For Montenegro, the issue is partly defensive. If income earned in Montenegro is taxed below the global minimum and Montenegro does not collect the qualifying top-up, another country in the group structure may be entitled to do so. The low Montenegrin tax rate would then benefit a foreign treasury rather than the investor.
That changes the economics of investment incentives. A tax holiday, credit or preferential regime may still support a domestic company outside the scope of Pillar Two. For a covered multinational, however, the benefit can be neutralised by top-up tax. Governments seeking major international investments will have to rely more on infrastructure, skills, energy access, accelerated depreciation, grants designed consistently with international rules and the speed of permits.
The calculation is far more complex than comparing the statutory Montenegrin rate with 15%. Pillar Two uses a jurisdictional effective tax rate based on adjusted financial-accounting income and covered taxes. Deferred tax, losses, tax credits, intra-group payments and the location of employees and tangible assets can change the result. A company paying 9% corporate tax does not automatically owe a simple additional 6% on its accounting profit.
This is why the principal burden is initially administrative. Covered groups need a complete map of their Montenegrin entities, permanent establishments, ownership chains, financial statements, deferred-tax positions and local incentives. Data that was previously immaterial to a parent company’s tax return may now affect a jurisdiction-wide calculation.
The law reportedly provides an 18-month deadline after the end of the relevant fiscal year for filing and payment, with entity-level penalties ranging from €3,000 to €40,000 for non-compliance. Groups should confirm those deadlines against their fiscal year and any transitional or safe-harbour provisions. A technical overview of the enacted regime sets out the threshold, deadline and penalty range.
Montenegro is also preparing the information-exchange infrastructure needed for the system. In June, the Government approved tax-administration amendments connected with the automatic exchange of top-up-tax information under the EU’s latest administrative-cooperation rules. This is essential because no national authority can administer Pillar Two using domestic returns alone.
The revenue effect may initially be modest. Montenegro has few domestically headquartered groups above the threshold, while multinational subsidiaries may already be taxed through structures that produce an effective rate close to or above 15%. But the absence of large immediate receipts would not make the law insignificant. Its greater effect is on investment modelling and the design of future incentives.
For most entrepreneurs, Montenegro’s 9–15% corporate tax system remains intact. For groups above €750 million, the relevant question is no longer the rate printed in the national tax law. It is the final effective rate produced across the group—and which country is entitled to collect any difference.
