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O nce- O nly T echnical S ystem
Simplifying cross-border
data exchange

The Once-Only Technical System: Simplifying cross-border data exchange

Discover everything you need to know about the Once-Only Technical System.
The EU infrastructure enabling secure, seamless cross-border data exchange between public authorities.

Freedom to move, work, and study without the paperwork

Moving forward, when completing administrative procedures abroad, citizens and businesses no longer need to search for their official documents. With the Once-Only Technical System (OOTS), public authorities can exchange verified data directly at citizens' request, reducing paperwork and making cross-border admin faster, cheaper and more reliable.

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The Once-Only Technical System can benefit everyone in the Single Market

  • Citizens & Businesses

    Save time and money on cross-border services.

  • Public Administrations

    Work more efficiently with trustworthy, real-time data.

  • The European Economy

    Gains mobility, competitiveness, and cohesion across Member States.

Many procedures, one effortless experience

The numbers behind the Once-Only Technical System.

  • Procedures

    232

    Administrative procedures, in scope of the OOTS, allow users to request specific evidences from another Member State.

  • Procedural requirements

    60

    Procedural requirements are facts or compliance defined by competent authorities responsible for the procedures in scope of the OOTS.

  • Evidences

    372

    Evidences are official documents or data that are retrieved by competent authorities responsible for procedures in scope of OOTS in response to a request from a citizen or business.

  • Authorities

    107

    Authorities are the official providers of evidences that are used to meet procedural requirements in other Member States.

Go to the Evidence Explorer dashboard (opens in a new tab)

Unlock tomorrow with Once-Only today

  • Learn about the OOTS

    Explore what OOTS means for Europe, and what benefits await.

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  • Do you need to connect?

    Find out if your authority is in scope of the SDGR and the OOTS.

    Learn more

  • Implementation tracker

    Take a look at how the European Union has been implementing the OOTS with the Acceleratormeter.

    Learn more

  • Join our events

    Read how Member States and Authorities have been implementing OOTS, and get involved through our Projectathons and future local events.

    Learn more

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