Of course it will be more expensive to be a single parent and run a household alone. That will always be the case. I have dealt with this point. Did you read what I wrote? Sorry if I didn't explain what I mean clearly, if you can tell me which part I can try again. (Don't want this to come across wrong or rude, really mean it! Thought I'd explained). It will always cost more. That is fine. Most countries don't then also A) try to compound that obvious extra cost by also taxing you a high % on the same income so you have less money before you even start paying those same costs a couple can split even though you earned the same income as them, and then B) take away services that should be universal in a sensible system but even if a country is mad enough to want to spend money to means test, do so at half of the income a two adult household could earn before that happens.
So you end up with no just the fact that of course it will always cost more to live alone which is fine, but with the tax system adding two disadvantages on top. This is not normal. Most countries do not choose to deliberately disadvantage households already at an inbuilt disadvantage further. Not because they are kind.
Because it makes no sense, and costs everyone more if you do that.
You can never put single parents in the same position as two parent families and like you say nor should this really be a Government objective. But it makes no sense to add to the disadvantage they have with less time to earn or be with children and higher costs by also taking them a higher % of income than other households earning the same, to add to the disadvantage. Just end up then with lots of people never achieving their earning or tax paying potential, paying more welfare, lots of kids who won't achieve potential either, less tax money... an on it goes. A bad strategy.
Same as it costs everyone more if you make a tax system where it's not worth lots of people working more, especially people who pay lots of tax.
That's crazy. Nobody should even need to look at the research to be able to work out that is a bad idea.