The big four U.S. banks, including Bank of America (NYSE:BAC) and Citigroup (NYSE:C), hold nearly $8 trillion worth of assets on their books. Even after regulations aimed at ending too-big-to-fail banks, many people believe more needs to be done. Unveiled this week, a new proposed tax plans aims to impose a new tax on banks that exceed a certain threshold.

In this segment of The Motley Fool's financials-focused show, Where the Money Is, banking analysts Matt Koppenheffer and David Hanson discuss the plan and the likelihood of its passing. Matt believes the tax would create a lack of transparency in the shadow banking system as banks try to reduce the amount of assets on their books.