Pillar Two (global Minimum Tax) in Croatia 2026: Practical Compliance Steps for Multinational Groups

Global minimum tax Croatia obligations become operationally binding for in-scope multinational groups during 2026, and the practical demands on in-house tax teams are substantial. The Pillar Two framework, built on the OECD’s Global Anti-Base Erosion (GloBE) Model Rules and transposed across the European Union through Council Directive (EU) 2022/2523, requires large groups to compute an effective tax rate (ETR) in each jurisdiction and to pay a top-up tax where that rate falls below 15%. For groups with Croatian constituent entities, this means scope screening, jurisdictional ETR calculation, collection mechanics and a GloBE Information Return must all be managed to statutory deadlines.

This guide sets out the compliance process step by step, with worked numbers, required documents, cost ranges and the dispute routes available. It is written for tax directors, group finance and advisers who need to move from theory to filing.

Intro & Key takeaways

The global minimum tax Croatia regime is not a planning option, it is a filing obligation for groups that cross the consolidated revenue threshold. The sections below convert the OECD and EU rules into an executable workstream for the 2026 compliance year.

• Act now if your group has turnover at or above €750 million. Groups meeting the GloBE threshold with any Croatian presence are in scope and must plan data collection months ahead of filing.
• 2026 is an operational year. Calculation, payment and information-return workflows must be stood up and tested, not deferred.
• The GloBE Information Return is the central filing. It drives data requirements, validation and retention across every jurisdiction.
• Top-up tax may be collected domestically or through EU mechanisms. Treasury and tax must coordinate to avoid double collection and cash-flow surprises.

Who this guide is for

This guide is for in-house tax and finance teams at multinational enterprise (MNE) groups with Croatian constituent entities, and for the external advisers supporting them. It assumes familiarity with consolidated accounting and corporate tax but not with the detailed mechanics of the GloBE rules. If you are screening whether your group is in scope at all, start with the eligibility section.

Quick action checklist

• Confirm whether consolidated group revenue meets the GloBE threshold in at least two of the four preceding fiscal years.
• Map every constituent entity, including Croatian holdings, branches and permanent establishments.
• Assemble consolidated financial statements and jurisdictional tax data for the ETR calculation.
• Identify the filing entity and signatory authority for the GloBE Information Return.
• Check the latest Croatian Ministry of Finance and Tax Administration guidance for local filing channels and deadlines.

1. Overview & policy context

Pillar Two is the second pillar of the OECD/G20 Inclusive Framework’s response to base erosion and profit shifting. Its central mechanism, the GloBE rules, is intended to ensure that large multinational groups pay a minimum effective rate of 15% on income arising in each jurisdiction where they operate. Where the jurisdictional ETR falls below that floor, a top-up tax restores the group to the minimum. The design is deliberately coordinated: it operates through interlocking rules so that if one jurisdiction does not collect, another can.

Pillar Two in the EU and Croatia

Within the European Union, Pillar Two is given legal force by Council Directive (EU) 2022/2523 on ensuring a global minimum level of taxation for multinational enterprise groups and large-scale domestic groups in the Union. The Directive obliges every Member State, including Croatia, to transpose the GloBE architecture into domestic law. That architecture comprises an Income Inclusion Rule (IIR), an Undertaxed Profits Rule (UTPR) as a backstop, and the option of a Qualified Domestic Minimum Top-up Tax (QDMTT) that allows a state to collect top-up tax on low-taxed profits arising within its own borders.

For the global minimum tax Croatia position, the QDMTT route is particularly significant because it keeps collection, and the related audit and dispute activity, within Croatia rather than ceding it to a parent jurisdiction. Croatia has adopted a dedicated Minimum Global Tax Act (Zakon o minimalnom globalnom porezu) to transpose the Directive; local implementing provisions are published in Narodne novine, the Official Gazette, and administrative guidance is issued by the Ministry of Finance (Ministarstvo financija) and the Tax Administration (Porezna uprava). Practitioners should always verify the exact Narodne novine entry and the current ministerial notice before relying on any filing mechanic.

Why 2026 is an implementation year

The EU Directive required the IIR and the domestic top-up measures to apply to fiscal years beginning on or after 31 December 2023, with the UTPR generally applying to fiscal years beginning on or after 31 December 2024. For most groups with a calendar-year accounting period, the first full compliance cycle is therefore already running, and 2026 is a year in which calculations, top-up determinations and information returns for earlier periods must be executed in practice, ETR computations finalised, top-up tax determined and paid, and the GloBE Information Return prepared and filed. The transition reliefs and safe harbours that smoothed the earliest periods are time-limited, which means the margin for relying on simplified calculations narrows.

Croatian administrative guidance and filing infrastructure are expected to continue maturing, so teams should build flexibility into their processes and revisit Porezna uprava guidance regularly. The likely practical effect is that groups which treated the first years as a dry run now face genuine liability and penalty exposure.

2. Eligibility, who is in scope in Croatia

Scope is the gateway question for the global minimum tax Croatia analysis. The rules apply to constituent entities of MNE groups whose consolidated revenue meets the GloBE threshold. Getting this wrong in either direction is costly: unnecessary compliance effort on one side, missed filings and penalties on the other.

Screening checklist

Work through the following decision rules in order. If the group falls out at any step, document the conclusion and the supporting data.

• Revenue threshold. Does the group’s consolidated annual revenue equal or exceed €750 million in at least two of the four fiscal years immediately preceding the tested year? If no, the group is outside the GloBE scope.
• Group status. Is there an ultimate parent entity preparing consolidated financial statements, with at least one entity or permanent establishment in a jurisdiction other than the UPE’s? A purely domestic Croatian group may still be caught by the large-scale domestic group provisions under the EU Directive.
• Croatian nexus. Does the group have a constituent entity, branch or permanent establishment located in Croatia? This determines Croatian filing and potential QDMTT exposure.
• Excluded entities. Are any Croatian entities excluded entities, for example governmental entities, international organisations, non-profit organisations, pension funds, or certain investment and real estate investment vehicles? Excluded entities are removed from the charging provisions but may still affect revenue testing.
• Safe harbours. Does a transitional Country-by-Country Reporting safe harbour or other qualifying safe harbour apply to the Croatian jurisdiction, reducing the full calculation to a simplified test for the period?

Examples

Example A, corporate group with a Croatian holding company. A German-headed group with €1.2 billion consolidated revenue holds its regional operations through a Croatian holding company, which in turn owns subsidiaries in three EU states. The group is in scope. The Croatian holding is a constituent entity; Croatia may apply a QDMTT to any low-taxed Croatian profit, and the German UPE applies the IIR to foreign low-taxed income. The Croatian entity must contribute data to the group GloBE Information Return and may carry a local filing obligation.

Example B, branch-only presence. A US-parented group with €900 million revenue operates in Croatia only through a branch (a permanent establishment) of a Dutch constituent entity. The group is in scope globally. The Croatian permanent establishment is itself a constituent entity for GloBE purposes, and its income and covered taxes are allocated to the Croatian jurisdiction for ETR testing. Even without a Croatian company, the branch creates a Croatian jurisdictional calculation and potential QDMTT exposure.

3. Step-by-step compliance process

The following seven steps form the core compliance workflow for the global minimum tax Croatia obligation. Treat them as a sequential project with defined owners and durations. The three tables that follow set out the timeline, the documents you must gather and indicative cost ranges.

Step 1, Establish scope & identify constituent entities

Build a complete legal-entity structure chart showing ownership percentages, tax residence and the location of permanent establishments. Confirm the ultimate parent entity and any intermediate parent entities, because these determine which entity applies the IIR and where filing responsibility sits. Flag excluded entities and joint ventures, which follow specific rules. This mapping underpins every later calculation, so inaccuracies here propagate downstream.

Step 2, Collect financial & tax data

Data collection is the most time-consuming phase. Start from the consolidated financial statements used for the UPE’s accounts, because GloBE income begins with financial accounting net income determined under that consolidation standard. For each constituent entity gather: the financial accounting profit or loss before consolidation eliminations, the current and deferred tax expense, jurisdictional tax returns and assessments for recent years, transfer pricing documentation (Master and Local files), payroll and social-security records, and the fixed-asset register with tax bases. Build reconciliations between book figures and the GloBE adjustments, and document every transfer pricing adjustment with its timing. Timing differences between book and tax recognition must be tracked carefully because they feed the deferred-tax component of covered taxes.

Step 3, Compute GloBE ETR per jurisdiction

The ETR is calculated jurisdiction by jurisdiction, not entity by entity. The numerator is the sum of adjusted covered taxes of all constituent entities in the jurisdiction; the denominator is the net GloBE income of that jurisdiction. Covered taxes include taxes on income and profits and certain substitute taxes, adjusted for deferred-tax movements within defined limits. GloBE income starts from financial accounting net income and applies a series of prescribed adjustments, for example removing excluded dividends, excluded equity gains, policy-disallowed expenses and certain timing items. Apply any available exclusions and the substance-based income exclusion where relevant. Divide adjusted covered taxes by net GloBE income to produce the jurisdictional ETR, and compare it to the 15% minimum.

Step 4, Calculate top-up tax & allocate to jurisdictions

Where a jurisdiction’s ETR is below 15%, compute the top-up tax percentage as the difference between 15% and the jurisdictional ETR. Apply that percentage to the excess profit, net GloBE income after deducting the substance-based income exclusion, to arrive at the jurisdictional top-up tax. A Qualified Domestic Minimum Top-up Tax collected locally reduces the top-up otherwise charged at the parent level. Allocate the residual top-up among constituent entities and determine which charging rule applies: the QDMTT first, then the IIR at parent level, then the UTPR as a backstop. Coordination across jurisdictions is essential to avoid collecting the same top-up twice.

Step 5, Determine local top-up collection mechanism and prepare for payment

Establish how Croatia will collect any Croatian top-up tax, whether through the domestic minimum top-up tax on the local filing and payment schedule, or whether the charge arises at parent level under the IIR. Confirm payment deadlines, the paying entity and the mechanics of settlement. Treasury should model the cash-flow impact and ensure funds are available for the computed liability, which can be material in high-profit, low-tax jurisdictions.

Step 6, Prepare and submit the GloBE Information Return & local filings

Prepare the GloBE Information Return using the standardised data points required under the Inclusive Framework’s agreed format. Itemise the required schedules, group structure, jurisdictional ETR computations, top-up tax computations and the elections made, and run the validation checks before submission. Confirm the signatory authorisation and the submission route, whether a single filing by a designated filing entity with information exchange, or a local filing in Croatia. Submit any accompanying local Croatian filings and payment notifications in line with Tax Administration requirements.

Step 7, Retain documentation & prepare for audit

Retain the full working papers, source data, reconciliations and elections. The GloBE calculation is audit-sensitive because it draws on consolidated accounts, local tax data and transfer pricing positions simultaneously. Maintain a defensible file that links each number back to its source, and keep past rulings, APAs and audit correspondence accessible. Retaining documentation for the full statutory limitation period is prudent given the layered nature of the data and potential cross-border enquiries; confirm the applicable retention period under current Croatian law.

Table A, Step / Who / Duration timeline

Table B, Required documents

Table C, Costs / fees (indicative estimate ranges)

The figures below are broad indicative ranges for planning only; actual costs vary significantly by group size, complexity and adviser. They are not official tariffs.

4. Calculation mechanics & worked example

The mechanics are easier to follow with numbers. The worked example below is illustrative only; the assumptions block makes every input explicit so that the method, rather than the figures, is the takeaway.

Example assumptions & scope

• Group consolidated revenue: €1.5 billion (in scope).
• Structure: a Croatian parent constituent entity, plus two foreign subsidiaries in Jurisdiction X and Jurisdiction Y.
• Jurisdiction X: net GloBE income €20 million; adjusted covered taxes €1.6 million.
• Jurisdiction Y: net GloBE income €10 million; adjusted covered taxes €1.0 million.
• Croatia: net GloBE income €15 million; adjusted covered taxes €2.7 million.
• Substance-based income exclusion assumed at €2 million in Jurisdiction X and €1 million in Jurisdiction Y for simplicity.

Stepwise calculation

Jurisdiction X ETR. ETR = adjusted covered taxes ÷ net GloBE income = €1.6m ÷ €20m = 8%. This is below 15%. The top-up percentage is 15% − 8% = 7%. Excess profit = net GloBE income − substance-based income exclusion = €20m − €2m = €18m. Top-up tax = 7% × €18m = €1.26 million.

Jurisdiction Y ETR. ETR = €1.0m ÷ €10m = 10%. Below 15%. Top-up percentage = 15% − 10% = 5%. Excess profit = €10m − €1m = €9m. Top-up tax = 5% × €9m = €0.45 million.

Croatia ETR. ETR = €2.7m ÷ €15m = 18%. Above the 15% minimum, so no Croatian top-up tax arises on these facts. The Croatian parent, however, applies the Income Inclusion Rule to the low-taxed foreign income, bringing in €1.26m from Jurisdiction X and €0.45m from Jurisdiction Y, a combined top-up of €1.71 million, unless those jurisdictions collect a qualifying domestic minimum top-up tax first, which would reduce the IIR charge correspondingly.

If instead the Croatian jurisdiction had shown an ETR of, say, 12%, Croatia could collect the resulting Croatian top-up under a domestic minimum top-up tax, keeping that revenue and the associated compliance within Croatia. This is the practical heart of the global minimum tax Croatia collection choice.

Interpretation & flags

Common issues include rounding at each stage, carry full precision until the final figure, and the correct treatment of deferred taxes, which can push a jurisdictional ETR above or below the floor from year to year. Watch for the substance-based income exclusion, which reduces the base to which the top-up percentage applies and can materially change the liability. Finally, ensure that any QDMTT already paid is credited against the IIR charge to prevent double collection.

Top-up collection options: Croatia vs. EU mechanism

5. Reporting & filing, GloBE Information Return in Croatia

The GloBE Information Return is the standardised return that captures the group’s structure, jurisdictional ETR computations, top-up calculations and elections. It may be filed centrally by a designated filing entity and exchanged between tax administrations, or filed locally in Croatia where no qualifying exchange arrangement applies. Confirm the route early, because it changes who signs and where attachments are lodged.

Filing timeline & deadlines

Under the agreed framework, the first GloBE Information Return and any related notifications are generally due within an extended transitional window measured from the end of the first reporting fiscal year, with a shorter standard deadline applying to later years. Because the precise Croatian deadline, portal and format are set by the Ministry of Finance and the Tax Administration, verify the current date and submission channel on their official pages before finalising your calendar. Do not rely on general statements; the global minimum tax Croatia filing date should be confirmed against live Porezna uprava guidance and the relevant Narodne novine entry. Begin preparation well ahead of the deadline, as the return consolidates data from across the group.

Data validation & reconciliation tips

Validate that jurisdictional income and covered taxes reconcile to the consolidated accounts and to local tax returns. Check that every election is recorded consistently across periods, that currency conversions use the correct rates, and that excluded entities are treated uniformly. Run the format validation required for electronic submission before the deadline, and keep a reconciliation log that an auditor could follow without further explanation.

6. Collection, credits & relief, how Croatia will apply top-up

Croatia’s collection of top-up tax depends on which charging rule bites. A Qualified Domestic Minimum Top-up Tax allows Croatia to collect top-up on low-taxed Croatian profit directly. Where the charge instead arises at parent level, the Income Inclusion Rule applies, and the Undertaxed Profits Rule operates only as a backstop. Credits are central: a QDMTT paid in a jurisdiction reduces the top-up otherwise due under the IIR, preventing the same profit from being taxed twice.

Interaction with the EU minimum tax directive

Because Croatia implements Pillar Two through Council Directive (EU) 2022/2523, its domestic rules must align with the EU-wide framework, and the Directive’s coordination provisions govern how charges and reliefs interact between Member States. This EU overlay is intended to make cross-border crediting more predictable within the single market and to reduce the risk of unrelieved double taxation between EU jurisdictions.

Practical treasury implications

Model the cash impact of any top-up early. A domestic minimum top-up tax is payable on the Croatian schedule and must be funded locally, while an IIR charge at parent level affects group cash elsewhere. Align intercompany funding and dividend timing so that liabilities can be met without last-minute scrambling, and factor the liability into forecasts and covenant calculations.

7. Disputes, administrative review & appeals

Where a top-up assessment is contested, Croatia offers a structured route from administrative objection through to the courts, and cross-border mechanisms sit alongside the domestic process.

Administrative steps & contact points

The usual sequence begins with an administrative appeal (objection) against the tax assessment to the Tax Administration (Porezna uprava) within the statutory period, followed, if unresolved, by an action before the competent administrative court (upravni sud). Confirm the exact deadlines and the responsible office on the Tax Administration’s published guidance, as these govern whether a further challenge is admissible.

Strategic considerations for appeals

Pillar Two disputes often turn on data and methodology rather than pure legal interpretation, so a well-documented calculation file is the strongest asset. Where double taxation arises between jurisdictions, the Mutual Agreement Procedure under applicable tax treaties and EU dispute-resolution mechanisms (including under the EU Tax Dispute Resolution Directive, where applicable) may provide relief in parallel with domestic appeals. Engage counsel early to preserve the available routes.

8. What changes around 2026, quick list

• Full operational application of the domestic top-up and Income Inclusion Rule for calendar-year groups.
• Expected continued maturation of Croatian administrative guidance from the Ministry of Finance and Tax Administration.
• Application of the Undertaxed Profits Rule as a backstop for groups where the IIR does not fully apply.
• Narrowing availability of transitional safe harbours, increasing reliance on full calculations.
• Confirmation of filing portals and formats for the GloBE Information Return, verify on official sources.

Common pitfalls & how to avoid them

• Incomplete data. Missing local tax returns or TP files stall the ETR calculation, build a central data request with owners and deadlines.
• Mis-applied exclusions. Over- or under-claiming excluded entities or the substance-based exclusion distorts the base, document the basis for each.
• Inconsistent consolidation. Using figures from the wrong accounting standard breaks the GloBE starting point, anchor to the UPE consolidation.
• Timing mismatches. Deferred-tax treatment errors swing the ETR across the 15% line, reconcile book-to-tax timing carefully.
• Ignoring QDMTT credits. Failing to credit domestic top-up against the IIR causes double collection, track credits by jurisdiction.
• Late portal checks. Relying on prior-year deadlines or formats, re-verify Croatian filing mechanics regularly.
• Weak audit trail. Numbers without source links invite challenge, maintain a traceable working-paper file.
• Siloed treasury. Calculating liability without funding it, involve treasury from the top-up stage onward.

Resources, downloads & next steps

The global minimum tax Croatia obligation is now an operational reality for in-scope groups, and the 2026 cycle rewards early, well-documented preparation over last-minute calculation. Use the screening checklist and the seven-step process above to build your workstream, verify the latest Croatian filing mechanics on official sources, and keep a traceable file for audit and appeal. For jurisdiction-specific support, see the Croatia, Tax practice page and the GLE lawyer directory for Croatia tax lawyers.

Sources

1. OECD, BEPS and Pillar Two (GloBE) / Inclusive Framework materials
2. OECD, Inclusive Framework on BEPS
3. European Commission, Minimum corporate taxation (Pillar Two)
4. EUR-Lex, Council Directive (EU) 2022/2523 (Minimum taxation)
5. Croatian Ministry of Finance (Ministarstvo financija)
6. Croatian Tax Administration (Porezna uprava)
7. Narodne novine (Official Gazette of the Republic of Croatia)