The loss in Column 3 should not be interpreted as the taxes that states would collect if Congress enacted legislation establishing nexus for firms with economic rather than physical presence. Rather, it is simply the incremental effect of e-commerce beyond any losses already occurring from inability to collect sales and use taxes. Column 2, the total e-commerce revenue loss of $20.1 billion, is the estimate of the total revenues from collecting all taxes due on e-commerce transactions.26 This estimate assumes 100 percent compliance with the sales and use taxes.