The point of the minimum income is to:
- Ensure an acceptable minimal standard of living.
- Free people up to pursue education and make other constructive personal investments/self-improvement.
- Advance the economy by providing direct stimulus to those most likely to spend, thus creating a strong increment in aggregate demand.
- Streamline welfare administration and improve efficiency of benefit distribution (due to it replacing and consolidating all kinds of separate welfare programs and their multiple administrations).
- Counteract and remedy the fallout of structural unemployment due to outsourcing and automation.
- Encourage employers to provide more amenable working conditions/pay standards (people won't work torturous jobs with minimal pay unless they absolutely have to due to accumulation of expenses that outweigh the minimum income).
250,000,000 adults
Each receiving $12,060 for a total of $3,015,000,000,000
Subtract Social Security's $972.6 billion (2017 budget)
Medicare: $605 billion
Welfare: $392.1 billion
Sourced from:
Government Spending Details in $ billion: Federal State Local for 2017 - Charts
Net Increase after deductions/consolidations: $1,045,900,000,000
Amount rebated back to government in taxes: (31.5% 2015 average tax rate): $3,015,000,000,000 * .315 = $949,725,000,000
Net Increase in deficit after deductions and taxes: $95,575,000,000 (250000000*12060*.685)-(9.726e11+6.05e11+3.921e11)
That said, I fully agree that MI makes no sense to pay out to the very wealthiest. Personally I'd exclude the top 5% by income, with a linear phase out from 20% to 5%; this works out to roughly 87.5% of the full top line cost as above 100-((15/2)+5) = 87.5%.
This would roughly work out to a net decrease in spending of $162,584,375,000 (250000000*12060*.685*.875)-(9.726e11+6.05e11+3.921e11).
Though this would no doubt incur some small increment of administrative cost and inefficiency due to there being basic means testing and scaling, a 250 billion dollar difference between MI with it, and MI without as above will easily more than cover that, including increment of the MI benefit to those covered, and the overall administrative costs of the MI; all without increasing the deficit.