Why do we need to push people into the workforce? There are a lot of social benefits to people being stay at home parents (which will be the commonest reason for doing so).

What fraud?

> You will then get the argument of "why should I be taxed more because I'm single"?

You might, but its a dishonest argument. You are taxing households together. You are giving each individual the same amount of tax free income and the same amount in the lower bands.

It is already possible for self employed people to do this by making their spouses a partner or shareholder in the business or similar. This is just extending the same rights to employed people.