Because they have chosen not to marry and not to share their finances and therefore do not constitute a "household" but are two independent individuals?
But if you are living together as a couple, there are expenses you share. You don't have two separate rental/mortgage contracts, two separate sets of utility bills. If you have children you share the expense and the care. You don't pay your council tax as a single person if you are a couple - unless you're fiddling the system for the 25% discount.
It doesn't matter whether you're married or not, if you live as a couple you are no longer independent, you are inter-dependent. That constitutes a "benefit unit" for the purpose of claiming means-tested benefits.
destroyed, what you're saying is you want all the benefits of living together as a couple, as well as being able to claim means tested benefits as though you are on your own. That's not just illogical, it's unreasonable. Put it into practice, it's fraud.
Your status when claiming benefits can only be:
- A single person, living on their own (whether in a relationship or not) claiming benefits as a single person.
- Unmarried but living with a partner as a couple, in which case you claim benefits as a couple.
- Married and living together as a couple, in which case you claim benefits as a couple.
- Married and not living together, in which case you would claim benefits as a single person.
If you are married but separated, you have to be able to show that the non-resident spouse is living at a different address for the purpose of claiming single parent benefits.
Same applies to couples who are living together who separate.
So in respect of means-tested benefits, married and non-married couples are treated exactly the same. Which is exactly how it should be.
Means-tested Benefits...the clue is in the name.