[Haegin]

It's also worth remembering that at the moment everyone in the UK gets a tax free allowance of £10,600 and an NI free allowance of about £8000 (in 2015/16). The basic income is expected to replace that as well, which means if everyone continues to earn the same amounts that's an extra £2000 per person earning more than £10k (roughly, assuming it's now taxed at 20% in the first tax bracket). NI would be less, and is probably more complex as employers pay some of that, but just assuming that only the employees contributions are now paid on what was previously NI free you're still looking at another £1k each. It's not much individually, but when you take out the costs of administering all of that it'll add up.