Payroll, employment costs and cross-border operations: Norway vs. Poland

Reporting: two platforms, two sets of deadlines 

Monthly payroll reporting in Norway runs through the A-melding system, which consolidates salary, tax withholding, and social security data in a single electronic submission due by the 5th of the following month. It feeds the Norwegian Tax Administration, NAV, and Statistics Norway simultaneously.

In Poland, ZUS receives social security declarations electronically each month, while the employer also handles PIT-4 (income tax advance) reporting and payment to the tax authority.

For companies running multi-country accounting Norway Poland payroll operations, having both reporting cycles managed in a coordinated way - with clear ownership for each deadline - is not optional.

Payroll errors that reach tax authorities are costly to correct retroactively in both countries.

Cross-border employment: social security coordination

Norway and Poland are both EEA members, meaning that EU social security coordination regulations apply. In practice, this means an employee who works in both countries - or moves between them - is generally covered by one country's social security system at a time, avoiding double contributions. The applicable system is determined by where the majority of work is performed, or where the employer is established, depending on the situation.

However, the practical application of these rules is not automatic. It requires documentation - typically an A1 certificate from the competent social security authority in the employee's home country - and a case-by-case assessment. For companies sending Norwegian employees to Poland, or posting Polish employees to Norway, managing these certificates is a compliance obligation that often falls through the cracks in the early stages of cross-border operations.

• Employees working primarily in one country: covered by that country's social security system.
• Employees working simultaneously in both countries: special rules apply; the competent authority must be determined and an A1 certificate issued.
• Posted workers (short-term assignments): home country social security generally continues to apply, with a certificate of coverage required.
• Third-country nationals: EEA coordination rules may not apply; separate assessment required.

What to put in place before you hire

For companies planning to hire in either Norway or Poland for the first time, or to expand significantly in either market, the following steps are worth completing before the first payslip goes out:

• Confirm entity registration: payroll can only be run once the legal entity is properly registered and has the necessary tax and social security registrations in place. In Norway, this means Bronnoysund registration and a tax withholding account. In Poland, ZUS and tax registration.
• Choose your payroll provider: for accounting outsourcing Norway Poland, using a single provider with genuine expertise in both countries significantly reduces the coordination overhead.
• Set up a Norwegian BankID or equivalent: international employees need a Norwegian D-number or national ID to be properly registered in the A-melding system.
• Clarify contract types in Poland: confirm which type of contract is appropriate for each role and document the rationale.
• Establish a payroll calendar: map out both countries' deadlines for the year ahead and assign ownership for each step.
• Review collective agreement obligations in Norway: confirm whether any applicable CBA sets higher minimum rates, working time rules, or other conditions for your sector.