samordningsnummer

coordination number

An identity number for people who are not, or not yet, entered in the Swedish population register, for example someone who works or studies here for less than a year. It lets agencies, employers and banks identify you even though you have no personnummer.

You can apply for one yourself if you plan to stay less than a year, have a connection to Sweden and can show why you need it. You must also attend an identity check at a service centre; in some cases a Swedish embassy can do it. Some authorities can also request a number for you.

If you later move here for a year or more, you report your move instead, and the coordination number is replaced by a personnummer.

You will meet it at
Swedish Tax Agency, population registration (Skatteverket, folkbokföring)
Also written
coordination number, co-ordination number, samordningsnumret
Alva