Estimates the net cost - after taxes - of a UBI set at $12,000 per adult and $6,000 per child, assuming a 50% marginal tax rate. The net cost is found to be $539 billion per year, while the gross cost is $3.45 trillion per year. The average net beneficiary is a family of about two people making $27,000 per year. Thei rnet benefit would be nearly $9,000.