The average American pays $10489 in taxes each year. Double the taxes and give average Americans $12000 and they'll come out ahead. Median Americans will do even better. Even if you assume no efficiency improvements, no benefits from velocity of money changes, and no cuts to existing social welfare programs such that the average tax increase equals the $12000 expenditure, you can fund it purely on taxes and most people will still end up with more money in their pockets.