Wall Street banks such as JPMorgan Chase need to get more aggressive with their bonus payments to stop the exodus of top talent leaving for boutique firms, Ralph Silva, director at Silva Research Network, told CNBC Monday.
"Bonuses are going to get much more aggressive to try to attract these people back out of the small firms, back into the big firms," Silva said.
More than 15 percent of the high earners in the tier-one banks have left either for foreign-listed banks or small boutique firms -- firms that only have five to ten people -- Silva said citing his own research.
- Watch the full interview with Ralph Silva above.
"These are the firms that JPMorgan and the like need to put the bonuses up to grab these people back because all the capacity is moving away from the tier-ones to the smaller banks and that's not good for the tier-one banks," he said.
There is a chance that the U.S. could follow Britain's example and introduce a windfall tax, according to Silva.
UK Chancellor Alistair Darling unveiled a one-off tax of 50 percent to take a chunk out of the 2010 bank bonus pool. The tax will affect any bonus worth more than £25,000 ($40.250), but will only be kept in place until April.
"I do believe we are going to see something in the US similar to what we've seen here in the UK," he said.
A bank bonuses tax would not have the desired effect and reduce the amount being paid in bonuses to high-level employees because the banks still need to keep the packages competitive, according to Silva.
"Banks only pay what they have to pay to keep the people. They don't pay one pound, one euro, one dollar more than they have to. So what makes the government think that if you're going to tax at 50 percent they would have to pay them 50 percent less? They would leave," he said.
The UK policy was introduced in reaction to a widespread public outcry at the bonuses paid by banks in the wake of the financial crisis. But many analysts point out that the 50 percent tax could be politically motivated ahead of the UK's general election this summer.
Because the tax would take funds directly out of the bank capital instead of the employees' pay packet, it could make the banks more risky, Silva added.