Someone entering a minimum wage job on £10k would pay 4.5K tax for a net income of £15.5k; they're better off by 55p in every pound they earn. Those entering minimum wage work today pay a 95% marginal rate of tax, being only 5p better off for every pound they earn.
I hope I haven't fucked up these figures. kabbes, where are you?
Nah, you don't need me. There's nothing wrong with your calculations. I don't think a lot of people realise how little incentive there is to take a minimum wage job compared with staying on unemployment benefit.
Looking at it from a total fiscal perspective -- let's say 40m people on £12k and 20m on £5k, to keep the numbers simple. That makes £580 thousand million (£580bn) -- call it £0.5tn. GDP is about £2.5tn. Theoretically, it means taxation on output needs to average around 20%.
Obviously its more complicated than that. Building it up instead:
Breakdown on UK public sector spending. I haven't looked around that website though, so I can't vouch for its accuracy. It has very detailed drill-downs though, so if they're making it up then they're going to a lot of work to do so.
One thing I get from exploring the website a bit is that "real UK GDP" is only about half that given by the Wikipedia figure of £2.5tn, above. Odd.
Anyway, if it's right, we currently spend £638bn in total in the public sector. Pensions and welfare make up £206.6bn of that. Drilling down to the item-by-item lists reveals probably about another £50bn that wouldn't be needed if there was a citizen's wage. Call it £250bn in total. By comparison, though, that's quite a shortfall to £580bn. It means a like-for-like spend could only give about half the proposed amount.
Then we have education and health, which make up £190.4bn. I assume that there would be no plan to privatise these though, and let people buy their own services? I wouldn't be an advocate of that.
One unknown factor is what the existence of the citizen's wage would do to the total tax revenue. It might go up, because disincentives to work on the grounds of marginal gainst have been removed. On the other hand, it might go down because you are removing the overwhelming
need to work.
The costs certainly seem uncertain, anyway.