Twinklemegan: "As for paying people to stay at home. As I said earlier, it is a fact that when a single parent, or both parents, go out to work, the Government will often be spending nearly as much, if not more, taxpayers' money on tax credits, childcare costs etc. than they would if they stayed at home. That is where the argument is flawed IMO." and "Well given that it's likely to cost as much to keep a child in childcare as the Government will pay in income support to a single parent I think it's pretty obvious. And there ain't going to be a lot of tax from a minimum wage salary to offset those costs."
You are misguided about how the tax system works. It costs taxpayers NOTHING MORE to pay out tax credits, childcare vouchers to a working parent. All that comes out of tax which THAT PARENT parent would pay out of THEIR OWN/HOUSEHOLD INCOME. Even if the tax credits and childcare vouchers equal that parent's income for a very low wage earner, the state is no worse or better off. It just does not collect tax from that parent's paid toil. In reality, that parents' tax is very likely to exceed tax credits/childcare vouchers etc so the government benefits by collecting the excess tax from that parent's income which it would not collect at all if that parent felt priced out of the job market but for the credits/vouchers. Society benefits all round from more working parents through increased tax coffers.
Contrast that with income support or child benefit or the so-called living wage to a SAHP. That SAHP is NOT working. They are not paying tax. To pay that SAHP, the government would have to fund the money out of other taxpayers' money, not that SAHP's tax because of course that SAHP does not pay tax. This will eat into the tax pot.
I totally understand the tax system is not a paying out what you put in system. But from the point of view of the taxman, comparing tax credits and childcare vouchers on one hand with income support etc on the other hand is comparing apples and oranges.