If you are a foreigner planning to live, work, invest, or start a business in Croatia, one of the first and most important administrative steps is obtaining a Croatia OIB number.

The OIB (Osobni identifikacijski broj) is not just a tax number. It is Croatia’s core personal identification system, used across all legal, financial, and government institutions. Without it, you cannot meaningfully interact with Croatian authorities, open a bank account, register a company, or complete most administrative processes.

In practice, obtaining an OIB is often the first step before residency, banking, or business setup.

My name is Šime Jozipović, founder and CEO of Mandracchio Capital. As a Croatian lawyer based in Split, with a Master of Laws (LL.M.) from Harvard Law School and a doctorate in international tax planning.

For more than a decade, I have advised foreign individuals, investors, and companies on entering the Croatian and EU legal system. In nearly every case, the Croatia OIB number is the starting point.

In this guide, I explain what an OIB is in Croatia, how foreigners can obtain it, and how it connects to residency, banking, tax system, and company formation.

Croatia OIB number
Key Information About the Croatia OIB Number
  • Purpose: Required for opening bank accounts, purchasing property, signing utility contracts, employment, company registration, and fulfilling tax obligations.
  • Format: 11 randomly generated digits.
  • Validity: Assigned once and valid for life.
  • Issuing Authority: Croatian Tax Administration (Porezna uprava).

What Is the Croatian OIB (Osobni identifikacijski broj)?

The Croatian OIB (Osobni identifikacijski broj) is a unique 11-digit personal identification number required for residents, foreigners, and legal entities to carry out legal, financial, or administrative actions in Croatia.

It is permanently assigned by the Croatian Tax Administration and never expires. Once issued, the Croatia OIB number remains linked to the individual or entity for life.

Foreigners can obtain it in person, through a Croatian embassy, or remotely, with processing time typically taking around eight days depending on the application method.

  • Single universal personal ID
  • Used for all purposes, including:
    • Taxation
    • Banking
    • Residency permits
    • Property ownership
    • Company registration
    • Health insurance
    • Legal and notarial acts
  • There is no separate tax number or civil ID alongside the OIB

In practice, the Croatia OIB number combines the roles of personal ID, tax ID, and administrative ID into one system.

Even as the EU prepares for the introduction of the Digital Euro, identification requirements such as obtaining a Croatia OIB number will remain essential for banking, taxation, and compliance purposes.

Why You Need an OIB

Croatian Tax Administration office in Zagreb where foreigners can apply for a Croatia OIB number for residency, banking, and business purposes
Croatian Tax Administration (Porezna uprava) office in Zagreb, where foreigners and residents apply for official identification and tax matters, including OIB registration.

From a foreigner’s perspective, the OIB is the entry key into the Croatian administrative system.

Foreign nationals need the Croatia OIB number to:

Without it, there is no legal or financial footprint in Croatia.

The OIB system applies equally to EU and non-EU nationals. The Croatia OIB number follows the same rules for everyone; differences arise later in residency and work authorization requirements, not at the OIB stage.

Is the OIB the Same as Residency?

Short answer: No. But this is a common misconception. The Croatia OIB number:

  • Does not grant the right to live in Croatia
  • Does not allow employment
  • Is not a residence permit

It is a purely administrative identifier and is often required before residency or company registration can even begin. Many foreigners receive their OIB months before their residence permit is approved.

How to Get an OIB for Residency Purposes

If you are applying for residency in Croatia, there are a couple of convenient ways to obtain your OIB:

  • Police Station (MUP): In some cases, you can receive your OIB when registering your temporary residence for the first time at the police station.
  • Tax Administration (Porezna uprava): Alternatively, you can apply directly at a tax office, as described above.

Basic Requirements:

  • Completed OIB request form
  • Copy of your passport (or valid ID)
  • Completed application form for OIB assignment

In practice, most applicants choose to obtain their OIB at the tax office beforehand, as it is often required for various administrative steps during the residency process.

Where to Obtain an OIB

If you are wondering how to get an OIB, it can be obtained through several legal channels:

Apply in Person in Croatia

You may apply at any local office of the Croatian Tax Administration.

Typical requirements:

  • Valid passport
  • Completed application form
  • Croatian address (temporary addresses are usually accepted)

Online Application for EU Citizens

EU citizens can apply remotely, and the process is not limited to the e-Građani system (which requires existing credentials).

  • e-Građani: Primarily for individuals who already have a Croatian Digital ID.
  • Without Croatian credentials: EU citizens can use cross-border identification systems or submit a request via official web forms or email.

Although the Digital ID is linked to your OIB, they are not the same. These two are often confused, but they serve different functions. For more details, see our guide: Croatia Digital ID (e-Citizens): What Foreigners Need to Know.

Remote Application (Foreigners)

Foreigners (both EU and non-EU) may request an OIB remotely by contacting the Croatian Tax Administration via the official “Pišite nam” contact system or designated email channels.

Typically required:

  • Scanned passport
  • Completed application form

Processing practices may vary depending on the office.

How to Apply for an OIB in Croatia: 3 steps

how to get croatian oib number

Applying for an OIB is straightforward and can be done after arriving in Croatia or even before arrival if you authorize a representative through a power of attorney. There is no requirement to begin the residency application process first.

To apply, you generally only need:

  • A valid passport or acceptable identification document
  • A completed application form

The OIB is issued free of charge.

Step 1: Complete the OIB Application Form

Applicants must complete the official form:
Zahtjev za određivanjem i dodjeljivanjem osobnog identifikacijskog broja (OIB)
(Application for the determination and assignment of the personal identification number)

The form is available in multiple languages, including:

  • Croatian
  • English
  • German

Step 2: Enclose an Identification Document

When submitting the application, you must present your passport and provide a copy, which will be submitted with the request.

If a passport is not available, the following identification documents may be accepted:

  • EU national identity card (for EU citizens)
  • National identification document from the country of citizenship, with proof of citizenship
  • Croatian ID card (osobna iskaznica), for Croatian citizens

Applications for Companies

If applying for an OIB for a company, the identification document is replaced with a deed of establishment, court decision, or registry extract.
The document must be:

  • Written in Croatian, or
  • Translated into Croatian by a certified court interpreter

Power of Attorney Applications

If someone applies on your behalf, a power of attorney must be included.

The power of attorney must be:

  • Notarized
  • Written in Croatian or translated into Croatian by a certified court interpreter

This option is commonly used by foreign founders and investors applying remotely.

Step 3: Submit the Application at the Tax Administration

You may submit your application at any local office of the Croatian Tax Administration (Porezna uprava), regardless of where you intend to live.

In many cases:

  • The OIB is issued within minutes
  • If not issued immediately, it will be prepared for later collection or sent to your registered address

Once issued, keep the confirmation document in a safe place. If lost, a replacement certificate can be requested at any time.

After your first residence permit is issued, your OIB will also appear on:

  • Your residence permit card
  • Your Croatian health insurance card, if applicable

OIB for Starting a Business in Croatia

For entrepreneurs, the Croatia OIB number is essential to company formation.

It is required to:

  • Register founders and shareholders
  • Appoint company directors
  • Register with the Commercial Court
  • Open a corporate bank account
  • Register for VAT when applicable

Each individual involved must have their own OIB, and the company itself receives a separate identifier after incorporation.

OIB and Taxes: What Foreigners Should Know

The Croatia OIB number also serves as your tax identification number.

It is used to:

  • Track taxable income
  • File personal and corporate tax returns
  • Register for VAT
  • Link health and pension contributions when applicable

Holding an OIB does not automatically make you a tax resident. Tax residency depends on physical presence, center of life, and applicable double taxation treaties.

How to Check an Existing OIB

Foreigners sometimes need to verify an existing OIB if documentation is lost or the number was issued years earlier. The Croatia OIB number can be confirmed through:

The Croatia OIB number can be confirmed through:

  • The Croatian Tax Administration (Porezna uprava):
    • In-Person: You can visit any local branch with your passport. They can issue a Duplicate OIB Certificate (Potvrda o OIB-u) on the spot.
    • Online Inquiry: There is an official OIB validation tool, but it only confirms whether an OIB is valid, it does not reveal or retrieve an unknown number
  • Official Documents and Records:
    • Tax & Real Estate Records: If you own property, your OIB is listed on the Title Deed (Vlasnički list) or any local utility bills.
    • Financial Records: Check your Croatian bank statements or the original contract used to open the account.
    • Company Registry: If you are a director or shareholder of a Croatian company, your OIB is publicly listed in the Court Registry (Sudski registar).
    • Notarial Acts: Any contract verified by a Croatian Public Notary (Javni bilježnik) must contain your OIB.

Because the OIB is permanent, it remains valid indefinitely.

Common Mistakes Foreigners Make

Despite its simplicity, errors at the OIB stage can cause delays across banking, residency, and business registration. Common mistakes include:

  • Assuming the OIB grants residency rights
  • Applying too late in the process
  • Errors in name spelling or passport details
  • Believing one OIB covers both personal and company use

The OIB system applies equally to EU and non-EU nationals. The Croatia OIB number follows the same rules for everyone; differences arise later in residency and work authorization requirements, not at the OIB stage.

Frequently Asked Questions (FAQ)

What Is an OIB Number in Croatia?

Many newcomers ask what an OIB number in Croatia actually represents. An OIB is Croatia’s official personal and tax identification number, used across all public systems. In practical terms, the Croatia OIB number functions as the reference point for nearly every interaction with authorities, banks, and courts.

Is the Croatia OIB number mandatory for foreigners?

Yes. Any foreigner engaging in legal, financial, or administrative activities in Croatia must have an OIB.

How long does it take to get an OIB?

In-person applications may be processed the same day, while remote applications typically take up to eight days.

Does an OIB expire?

No. Once issued, it is valid for life.

Can I apply for an OIB without living in Croatia?

Yes. Applications can be submitted through embassies, representatives, or official remote channels.

Can foreigners get an OIB in Croatia?

Yes. Foreigners can legally obtain an OIB in Croatia even if they do not yet have residence status. The OIB is available to EU and non-EU nationals and can be issued in person, through a Croatian embassy, or remotely via an authorized representative. It is often required before applying for residence, opening a bank account, or starting a business.

What is the ID number in Croatia?

The primary identification number used in Croatia is the OIB (Osobni identifikacijski broj). It is a unique 11-digit number assigned by the Croatian Tax Administration and used for all legal, tax, banking, and administrative purposes by individuals and legal entities.

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