Posted workers from Italy to Poland – A1

An Italian manufacturing company wins a project contract in Poland. It plans to send five engineers to Warsaw for eight months. The question arrives quickly: which social security system covers these workers, and what documents must travel with them? For Italian employers, the answer begins – and often ends – with the A1 certificate.

When an Italian employer posts workers to Poland, those workers may remain subject to Italian social security rather than Polish ZUS contributions, provided a valid A1 certificate is in place before the posting begins. The certificate is issued by the Italian social security authority (INPS) and confirms continued coverage under Italian law for the duration of the assignment. Without it, the Polish Social Insurance Institution (ZUS) may treat the worker as subject to Polish contributions from day one – triggering retroactive liability that can exceed EUR 10,000 per worker.

This page explains the full A1 procedure for Italian employers posting workers to Poland: the regulatory framework, the application process, the pitfalls that catch employers by surprise, and the cross-border tax and employment law obligations that run alongside the certificate. It also sets out a practical checklist for compliance before the first worker boards a flight to Warsaw.

What legal framework governs posted workers between Italy and Poland?

Both Italy and Poland are EU member states. The coordination of social security between them falls under Regulation (EC) No 883/2004 on the coordination of social security systems, together with its implementing Regulation (EC) No 987/2009. These instruments determine which country's social security legislation applies when a worker moves temporarily between member states. The A1 certificate is the document that gives effect to the "home-country rule" – the principle that a posted worker continues paying contributions in the sending state.

On the employment side, Directive 96/71/EC on the posting of workers – as revised by the Enforcement Directive 2014/67/EU and the amending Directive 2018/957/EU – sets the minimum conditions that must apply to posted workers in the host country. Poland implemented these rules through the ustawa o delegowaniu pracowników w ramach świadczenia usług (Act on the Posting of Workers in the Framework of the Provision of Services, the Posting Act). The Posting Act requires Italian employers to notify the Polish National Labour Inspectorate (Państwowa Inspekcja Pracy, PIP) before work begins. Failure to notify carries a fine of up to PLN 30,000.

The National Court Register (Krajowy Rejestr Sądowy, KRS) and the Polish Social Insurance Institution (Zakład Ubezpieczeń Społecznych, ZUS) are the two domestic institutions most likely to interact with an Italian employer's posting arrangement. KRS matters if the Italian company establishes a branch or subsidiary. ZUS matters whenever the A1 certificate is absent, incomplete, or covers the wrong period. A third institution – the Polish Financial Supervision Authority (Komisja Nadzoru Finansowego, KNF) – becomes relevant only in financial-sector postings.

There is one important boundary condition. The home-country rule applies only when the posting is genuinely temporary and the Italian employer continues to carry out substantial activities in Italy. An employer that exists solely to send workers abroad – a "letterbox company" – will not qualify. Italian INPS examiners and Polish PIP inspectors both check for this.

Maximum posting duration under the social security coordination rules: 24 months
Posting Act notification: before the first day of work in Poland
Fine for missing PIP notification: up to PLN 30,000
Retroactive ZUS exposure if A1 is absent: contributions plus interest from day one

How does an Italian employer obtain an A1 certificate for Poland?

The A1 certificate is applied for in Italy, not in Poland. The Italian employer submits the application to INPS – the Istituto Nazionale della Previdenza Sociale – through its online portal. The application must be filed before the posting begins. INPS typically processes standard applications within 30 days, though complex cases or cases involving prior postings to multiple countries may take longer.

The application requires the employer to demonstrate three things. First, that the employer carries out substantial activities in Italy – not merely administrative functions. Second, that the worker is habitually employed in Italy and has been on the Italian payroll for at least one month immediately before the posting (a stricter interpretation applies to workers hired specifically for posting). Third, that the posting will not exceed 24 months. Extensions beyond 24 months require a bilateral agreement under the EU coordination rules and the consent of both the Italian and Polish competent authorities.

We obtained a retroactive A1 certificate for a Lombardy-based construction company whose posted workers had been in the Silesia region for six months without documentation (autumn 2025). The case required demonstrating continuous Italian payroll coverage and coordinating with both INPS and ZUS to resolve the overlap period. The outcome avoided a ZUS assessment exceeding PLN 180,000.

Once issued, the A1 certificate must accompany the worker – either physically or in accessible digital form. Polish PIP inspectors may request it during an on-site inspection. The employer's Polish liaison or the worker themselves must be able to produce it within the inspection window, which in practice means immediately. Delays of even a few hours can trigger provisional ZUS registration.

Application filed with: INPS (Italy)
Standard processing time: approximately 30 days
Minimum prior employment in Italy: one month before posting
Maximum duration covered by a single A1 certificate: 24 months
Extension procedure: bilateral agreement, both competent authorities must consent

For Italian employers also managing postings from other jurisdictions, it is worth comparing the Swiss-Italian corridor. Our guide on posted workers from Switzerland to Poland and A1 certificates sets out how the third-country rules differ from intra-EU coordination.

What pitfalls most commonly affect Italian employers posting workers to Poland?

Experience across dozens of Italian posting arrangements reveals a consistent set of mistakes. Most are avoidable. Each carries a specific financial or operational consequence.

The first pitfall is late application. Italian employers frequently treat the A1 certificate as a formality to be resolved after arrival. It is not. If the certificate is not in place on day one of work in Poland, the worker is – from a Polish ZUS perspective – uninsured in Italy. ZUS may open a contribution assessment covering the entire uncertified period. Retroactive contributions, interest, and penalties can easily reach PLN 50,000 per worker for a six-month gap.

The second pitfall is posting duration creep. A project expected to last six months extends to eighteen. The A1 certificate covers six months. Nobody updates the certificate. This is among the most common sources of ZUS exposure. The employer must apply for an extension before the current certificate expires – not after.

The third pitfall is the PIP notification gap. The Posting Act requires a written notification to PIP before the first working day. The notification must include the worker's identity, the duration of the posting, the place of work in Poland, the Polish contact person, and the minimum wage basis. Italian employers sometimes assume that having an A1 certificate satisfies all Polish formalities. It does not. The A1 addresses social security only. PIP notification is a separate, employment-law obligation.

The fourth pitfall is the minimum wage trap. Posted workers in Poland are entitled to Polish minimum wage rules – currently PLN 4,666 gross per month as of early 2026 – even when they are paid under Italian contracts. If the Italian salary, after conversion and applicable deductions, falls below the Polish minimum, the employer is exposed to a PIP enforcement action. This catches employers who post lower-paid workers without adjusting the compensation structure.

A fifth, less obvious pitfall involves corporate tax exposure. A long posting – particularly one where the worker has authority to conclude contracts on behalf of the Italian employer – may create a permanent establishment (PE) in Poland. PE status triggers Polish corporate income tax obligations on profits attributable to Polish activities. For more on the tax dimension of Italian business in Poland, see our Italian tax practice page.

How do cross-border employment and tax obligations interact for Italian postings?

The A1 certificate resolves the social security question. It does not resolve income tax. These are parallel tracks, governed by different instruments, and Italian employers frequently conflate them.

Income tax for posted workers is governed by the Italy-Poland Double Tax Convention (DTC), which follows the OECD Model Convention. Under the DTC, a worker posted to Poland for fewer than 183 days in a 12-month period – and paid by an Italian employer with no Polish permanent establishment – will typically remain subject to Italian income tax only. Beyond 183 days, or where a PE exists, Polish income tax applies. The employer must then register as a Polish payroll taxpayer, withhold Polish income tax advances, and file with the Polish tax authority (Urząd Skarbowy).

We secured a favourable ruling for a Veneto-based IT company whose posted developer had inadvertently crossed the 183-day threshold in the Mazowieckie region (spring 2026). The matter required retroactive payroll registration, amended declarations, and a penalty mitigation application. Total exposure was reduced from PLN 95,000 to PLN 12,000 through early voluntary disclosure.

Employment law obligations run on a third track. Under the Posting Act, posted workers in Poland are entitled to the same minimum conditions as comparable Polish employees. This covers not just minimum wage but also working time rules, rest periods, health and safety standards, and – for postings exceeding 12 months (extendable to 18 months on notification) – almost the entire body of Polish labour law. Italian employers running long-term projects must audit their posted workers' conditions against Polish standards before the 12-month threshold is reached.

For employers with Ukrainian or CIS workers already employed in Italy who are being rotated through Poland, additional immigration considerations apply. Our analysis of employment law compliance for Ukrainian companies in Poland addresses the overlapping permit and social security questions in that context.

What should an Italian employer check before posting workers to Poland?

A structured pre-posting review reduces the risk of ZUS exposure, PIP fines, and tax complications to near zero. The review should cover five areas.

First, confirm the employer's eligibility. The Italian company must carry out genuine economic activity in Italy. If the Polish assignment is the first significant project and Italian operations are minimal, INPS may refuse the A1 certificate. The employer should document Italian payroll, Italian contracts, and Italian business premises before applying.

Second, verify each worker's eligibility. Each worker must be habitually employed in Italy. Workers hired from outside Italy specifically for the Polish posting do not qualify for the standard A1 route. They may qualify under different coordination rules, but the application is more complex and takes longer.

Third, file the INPS application at least 30 days before departure. Build in buffer time for INPS queries. If the project has a fixed start date, submit the application 45 to 60 days in advance.

Fourth, file the PIP notification. This is a separate step, filed with the Polish National Labour Inspectorate electronically. It must be completed before the first working day. Designate a Polish contact person – either an employee or an external adviser – who can respond to PIP queries within 24 hours.

Fifth, review the compensation package against Polish minimum wage and working-time rules. If the posting is expected to exceed 12 months, conduct a full audit of Polish labour law entitlements before the threshold is reached.

Document Italian economic activity: payroll records, contracts, premises
Confirm each worker's habitual employment in Italy (minimum one month)
Submit INPS application 45–60 days before departure
File PIP notification electronically before day one of work in Poland
Audit compensation against PLN 4,666 minimum wage (2026 rate)

One further consideration: if the posting involves workers who hold EU Blue Card status issued in Italy, the card itself does not automatically authorise work in Poland. The Blue Card covers residence and work in the issuing member state. Long-term postings by Blue Card holders to Poland require separate analysis under Polish immigration law. A work permit Poland framework may apply depending on the worker's nationality and assignment structure.

Frequently asked questions

Q: Can an Italian employer post workers to Poland without obtaining an A1 certificate if the posting is very short?

A: There is no statutory minimum duration that exempts a posting from the A1 requirement. Even a one-day assignment technically requires confirmation of the applicable social security legislation. In practice, INPS issues certificates for short postings, and Polish ZUS inspectors have authority to request documentation regardless of duration. Relying on the brevity of the assignment as a reason not to apply is a risk that can result in ZUS contributions being assessed for the entire period.

Q: What happens if the A1 certificate is applied for late – after the worker has already started work in Poland?

A: A late application does not automatically preclude coverage. INPS may issue a certificate with a retroactive start date, but this requires additional documentation and is not guaranteed. If ZUS has already opened a contribution assessment for the uncertified period, the employer must engage both authorities simultaneously to resolve the overlap. The process typically takes three to six months and may require a formal withdrawal of the ZUS assessment. Legal representation at this stage significantly improves the outcome. The irreversible consequence of inaction is that ZUS contributions, once assessed and not challenged within the statutory deadline, become enforceable debts subject to enforcement proceedings against the employer's Polish assets.

Q: Does the employment lawyer Warsaw market offer specialists in Italian cross-border posting matters?

A: Italian cross-border posting is a niche at the intersection of EU social security coordination, Polish labour law, and Italian INPS procedure. Firms with a dedicated international employment practice and an Italian desk are better placed than general employment lawyers to handle the dual-authority coordination that A1 disputes require. When selecting an adviser, ask specifically about experience coordinating with INPS on retroactive applications and with ZUS on overlap resolution. The whistleblower Poland framework – which requires posted workers to have access to a reporting channel – is an additional compliance layer that a specialist should address as part of the onboarding review.

For Italian employers considering the broader Polish tax and regulatory picture, a coordinated review covering both the employment and tax dimensions produces the most efficient outcome. Our team handles both tracks from a single engagement.

Posting workers from Italy to Poland involves a specific sequence of steps across two jurisdictions. Each step has a deadline. Missing one creates exposure that compounds quickly – retroactive ZUS contributions, PIP fines, and potential PE status are not theoretical risks. They materialise regularly, and they are disproportionately difficult to resolve after the fact.

To receive an expert assessment of your Italian posting arrangement – including A1 application support, PIP notification, and tax exposure review – contact info@kordeckipartners.com.

KORDECKI & Partners is a law firm based in Warsaw and Krakow, advising business clients across 30 jurisdictions. Our team combines expertise in Polish and international law with a practical approach to cross-border employment, posted worker compliance, and social security coordination. We work with Polish entrepreneurs, foreign investors, and in-house legal teams. To discuss your situation, contact info@kordeckipartners.com.