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A civil partnership is when two people live together in a relationship similar to marriage.
They form a civil partnership when they legally register their partnership in front of witnesses and can dissolve the civil partnership through a formal process akin to divorce.
Initially, only same-sex couples could register as civil partners, but since 2018 opposite-sex couples can do so as well.
Civil partners have the same tax rights as married couples:
…and also the same tax responsibilities as married couples: