The rules for benefits and tax credits apply to people who are living together as a couple in a relationship and not to people who are flat sharers or carers.
If you are in a couple you need to put in one claim form, giving details for yourself and for your partner. As a member of a couple, the income, savings and hours of work of both of the couple are taken into account.
In couples the calculator assumes that the first person referred to ('you' or 'client') claims the benefits. If you are both eligible to claim an out-of-work benefit you should consider carefully which one of you should make the claim. For more information see couples and out-of-work benefits.
If you are in a polygamous marriage you should seek further advice on your benefit entitlement.