JPMorgan is expected to report second-quarter earnings at 6:45 ET Thursday.
The largest USA bank by assets reported a profit of $6.2 billion, or $1.55 a share.
After adjusting for some items, earnings per share of $1.55 beat the consensus estimate of $1.43 by the analysts who were polled by S&P Global Market Intelligence.
Shares of JPMorgan gained 2.1 percent to $64.50 in opening trade.
The bank's move, which was unveiled in an Op-Ed Dimon penned for The New York Times, means the bank's minimum US wage of $10.15 an hour will climb to between $12 and $16.50 an hour, depending on factors like where employees work, over the next three years. Its average total loans grew by 8.1 percent on the year before.
Chief Financial Officer Marianne Lake said that the impact of Brexit will take time and it is too early to know for sure what will happen with the bank's employee base in the United Kingdom.
Some reports on Chase's announcement noted that while workers will get raises of $2 or more per hour, Dimon hit the jackpot on his own compensation package past year after the bank posted $24.4 billion in profits.
Non-interest expenses dropped by 6% to just over $13.6 billion due to lower bills in the legal department and cost cutting.
The vote to leave the European Union, known as Brexit, helped capital markets revenue at JPMorgan.
Trading revenues of $5.6 billion ($5.16 billion expected) were up 23% year-over-year.
While executive at JPMorgan said that trading had rebounded during both April as well as May that was previous, to the referendum vote that roiled the markets and pushed aside expectations for more US rate hikes to at least 2017. That means lending margins for big banks will remain under pressure. Revenue was $11.5 billion, up 4 percent from a year earlier.
At 10:46 a.m. EDT (1446 GMT), the Toronto Stock Exchange's S&P/TSX composite index.GSPTSE was up 62.76 points, or 0.43 percent, to 14,556.56. Management has said it should be about 15 percent, but to get there, the bank needs higher interest rates.
The Fed last raised rates in December, by 0.25 percentage points, after keeping them near zero for nearly a decade. "I'm still expecting earnings to be down year over year".
A consensus of 28 analysts who follow the bank had forecast a profit of $1.43 a share, with projections spread in a range from $1.34 a share to $1.54 a share. It also called into question how much money and time USA banks will have to spend to move from London their operations serving European customers.
JPMorgan's results topped Wall Street's expectations. On Thursday, Lake said dialogues about staff moves are "only in their infancy".