PRIVATE school: $32,000 a year per student.

Mortgage: $96,000 a year.

Co-op maintenance fee: $96,000 a year.

Nanny: $45,000 a year.

We are already at $269,000, and we haven’t even gotten to taxes yet.

Five hundred thousand dollars  the amount President Obama wants to set as the top pay for banking executives whose firms accept government bailout money  seems like a lot, and it is a lot. To many people in many places, it is a princely sum to live on. But in the neighborhoods of New York City and its suburban enclaves where successful bankers live, half a million a year can go very fast.

“As hard as it is to believe, bankers who are living on the Upper East Side making $2 or $3 million a year have set up a life for themselves in which they are also at zero at the end of the year with credit cards and mortgage bills that are inescapable,” said Holly Peterson, the author of an Upper East Side novel of manners, “The Manny,” and the daughter of Peter G. Peterson, a founder of the equity firm the Blackstone Group. “Five hundred thousand dollars means taking their kids out of private school and selling their home in a fire sale.”

Sure, the solution may seem simple: move to Brooklyn or Hoboken, put the children in public schools and buy a MetroCard. But more than a few of the New York-based financial executives who would have their pay limited are men (and they are almost invariably men) whose identities are entwined with living a certain way in a certain neighborhood west of Third Avenue: a life of private schools, summer houses and charity galas that only a seven-figure income can stretch to cover.