Social Security

Social security across borders, without the paperwork headache

Posted-worker immigration and EU social-security compliance: A1 portable document certificates, Certificates of Coverage, totalisation analysis and host-country notifications for inbound and outbound EU assignments.

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Trusted by global employers, scale-ups and Fortune 500s

Why it matters

From a Romanian engineer working three months in Berlin to a Brazilian specialist on a 12-month posting in Belgrade, we keep social-security contributions in the right country and your filings audit-proof. Whether you're sending talent out of the European Union or bringing them in, our specialists handle the full lifecycle on both sides of the border.

Topics & coverage

A1 certificate RomaniaCertificate of Coverage EUEU Regulation 883/2004 compliancePosted Workers DirectiveInbound EU posted workerOutbound EU posted workerMulti-state worker A1Workation A1 certificateTotalisation agreementHost-country notification SIPSI ZKO4Romania · Moldova · Serbia · Bulgaria · Brazil · Colombia

Why Nestlers

Built to own the complexity behind social security.

We own the numbers

Calculations, filings and reconciliations driven to closure by your dedicated team — never punted back.

Local rules, applied correctly

Direct delivery in our core markets, plus a vetted partner network for the wider region.

Payroll plus everything around it

Pair payroll with tax advisory, social security and EOR — one contract, one accountability line.

Cross-border specialists on tap

Shadow payroll, equalisation and edge cases handled by senior specialists, often within hours.

Built to scale cycle after cycle

From a single payslip to multi-country payroll runs — the engine flexes with your headcount.

Audit-proof, every cycle

Full audit trail on every calculation and filing — designed to survive scrutiny.

A1 certificates & Certificates of Coverage in 48 hours

We file for CoC with competent public authorities bodies as per bilateral social-security treaties. From single business trips to long-term postings — automated, error-free, audit-ready.

Posted workers under EU Reg. 883/2004
Multi-state workers in 2+ EU countries
Workations and short-term business travel
Bilateral CoCs (US, UK, Canada, Brazil, Serbia, Moldova, Turkey, Israel, Switzerland)

Totalisation analysis for inbound & outbound assignments

Before the contract is signed, we map your assignment against EU regulation 883/2004 and other bilateral treaties to confirm the correct jurisdiction — and surface every cost in advance.

Outbound EU to global hubs
Inbound EU from any origin

Posted-worker compliance, not just filings

Notifications in the host country, liaison with labour inspectorates, minimum-wage and working-time mapping, and ongoing support for the full duration of every posting.

Host-country notifications (SIPSI, ZKO4, Meldeplattform, etc.)
Minimum-wage and working-time benchmarking
On-site inspections and document trail

Service catalogue

Every sub-service in this practice

The specific social-security and posted-worker services we handle for cross-border populations.

Social-security & posted-worker filings

Obtaining CoC

Management of the procedure for obtaining the Certificate of Coverage confirming applicable social security legislation.

Public Health System registration

Handling of the formalities required to register and confirm eligibility for coverage under the relevant public health system.

European Health Cards

Handling of the administrative process for obtaining the European Health Insurance Card, subject to eligibility.

Posting of workers notifications as per the EU Directive

Preparation and submission of host-country notifications required under the EU Posted Workers Directive.

European pension

Handling of procedures related to European pension contributions, registration and confirmation, as applicable.

How it works

A clear, four-step engagement

Assess

Review the assignment, contracts, prior coverage and route mapping.

File

Prepare and submit A1s/CoCs with full supporting evidence in 48h.

Notify

Host-country notifications and minimum-condition mapping.

Maintain

Renewals, extensions and host-state interactions for the life of the posting.

Where we deliver from

Local Expertise. 60+ partner countries.

We employ, file and advise directly from our own entities in Romania, Moldova, Serbia, Bulgaria, Brazil and Colombia — and partner with vetted specialists in 60+ more countries to support your inbound and outbound EU mobility.

Bucharest

Romania

Headquarters

Chișinău

Moldova

Eastern hub

Belgrade

Serbia

Western Balkans hub

Sofia

Bulgaria

EU South-East hub