The highest-ranking executives at four firms have agreed under pressure to go without their bonuses, including John A. Thain, who initially wanted a bonus this year since he joined Merrill Lynch as chief executive after its ill-fated mortgage bets were made. And four former executives at one hard-hit bank, UBS of Switzerland, recently volunteered to return some of the bonuses they were paid before the financial crisis. But few think others on Wall Street will follow that lead.

For now, most banks are looking forward rather than backward. Morgan Stanley and UBS are attaching new strings to bonuses, allowing them to pull back part of workers’ payouts if they turn out to have been based on illusory profits. Those policies, had they been in place in recent years, might have clawed back hundreds of millions of dollars of compensation paid out in 2006 to employees at all levels, including senior executives who are still at those banks.

A Bonus Bonanza

For Wall Street, much of this decade represented a new Gilded Age. Salaries were merely play money — a pittance compared to bonuses. Bonus season became an annual celebration of the riches to be had in the markets. That was especially so in the New York area, where nearly $1 out of every $4 that companies paid employees last year went to someone in the financial industry. Bankers celebrated with five-figure dinners, vied to outspend each other at charity auctions and spent their newfound fortunes on new homes, cars and art.

The bonanza redefined success for an entire generation. Graduates of top universities sought their fortunes in banking, rather than in careers like medicine, engineering or teaching. Wall Street worked its rookies hard, but it held out the promise of rich rewards. In college dorms, tales of 30-year-olds pulling down $5 million a year were legion.

While top executives received the biggest bonuses, what is striking is how many employees throughout the ranks took home large paychecks. On Wall Street, the first goal was to make “a buck” — a million dollars. More than 100 people in Merrill’s bond unit alone broke the million-dollar mark in 2006. Goldman Sachs paid more than $20 million apiece to more than 50 people that year, according to a person familiar with the matter. Goldman declined to comment.