Updated : 26/01/2018
For the time being, the United Kingdom remains a full member of the EU and rights and obligations continue to fully apply in and to the UK:
Your employer can post you to another EU country to carry out a temporary service. During this period, you will acquire the status of a "posted worker" and benefit from special working conditions and rights.
While posted to another EU country, you fall under the conditions and terms of employment of the host country. These relate to:
Your employer may also pay your costs for travel, boarding and lodging in the EU country where you are posted, if this is foreseen in your home country's legislation. These allowances will have to be paid on top of your normal wage.
Check the national website of your host country to find out the terms and conditions of work for posted workers, as well as contact information of the local authorities.
While posted to another EU country:
If you are a posted worked for less than six months, you should not be liable to pay income tax in your country of destination.
However, there are no EU-wide laws laying down which country can tax your income during a posting. This may be set out in national laws or tax agreements between EU countries: find out more on income tax.
As a posted worker, you will continue to be covered by the social security system of your home country for a maximum of 2 years. Find out what formalities you need to carry out.
If you are working abroad for more than 2 years, you will have to switch to the social security system of the country where you work. In some specific cases, you can extend your social security cover to more than 2 years.
Your employer may also need to fill in an advance notification to the authorities in your country of destination stating your workplace there, the duration of your posting, and contact information, among other things.
Make sure that your employer takes care of this to avoid being fined in the other country.