The tax isn't based per head. We have 2 choices I strongly support on how we pay off the debt and I have preferences, but I'm fine with any of these. The choices are:
1) Start to pay if off now and pay a 17% capitol gains tax, a 14% necessity tax, and a 20% luxury tax. No more income tax or social security tax, which overall saves even the poorest working class Americans money since the income tax and the social security tax combined cost at least 16.2% of one's income, whereas if someone spent all their money on necessities, they would only pay a 14% sales tax on this, and very few people fall into the first income bracket, so most people end up saving more than 2.2% of their annual income on taxes to pay off the debt. Combine this with a lazzaire faire approach to immigration, and it would increase the GDP and tax revenue enough to pay off the debt in 2 years since our tax revenue would quadruple in the long term and increase 9 fold for the first year all while cutting the percentage of one's income Americans pay in taxes.
Or
2) Wait 50 years, balance all future annual budgets, and pay only a .6% capitol gains tax while having the same approach to immigration which would increase the tax revenue in the short and long term by significant amounts with such a small amount of tax.
If you don't think this amount of money will pay off the debt, I recommend you use a computer somewhere so you can access the spreadsheet.