also called posting of workers
An employee sent by their employer to work temporarily in another country while staying employed and insured at home.
An employee sent by their employer to work in another country for a while, staying on the home payroll and home social security instead of switching to the local system. Being posted rather than hired locally changes which country's rules cover you, and in Europe it usually needs paperwork like an A1 certificate. The A1 is the document that proves you stay insured at home; posted worker is the status it goes with.
Someone is sent by their firm to a project in another EU country and assumes they are covered as usual. Without the A1 certificate proving they still pay social security at home, they risk being asked to contribute in the host country too, paying into two systems at once.
Being posted rather than locally hired changes which country's social security and some labour rules apply to you, and it usually requires paperwork like an A1 certificate in Europe. Getting this wrong can mean paying social contributions twice or having none of the local protections you assumed.
A1 certificate
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