Indeed, city officials said that it was unclear, as of Thursday night, just how Mr. Bloomberg planned to generate the extra revenue in sales taxes: Would he repeal the sales tax clothing exemption? And would he increase the sales tax permanently? Or would he do what has been done before, and increase a portion of it temporarily?

The menu of budget options Mr. Bloomberg and his aides released in November called for a sales tax increase to 8.75 percent, generating almost $900 million. If that approach is approved, this is how the increase would affect New Yorkers, according to a consumer spending analysis by the city’s Independent Budget Office: An individual who makes $35,000 a year would pay an extra $55. Someone making $125,000 would pay $140 more a year. And someone making $500,000 a year would pay an additional $247.

In addition to the sales tax increase, Mr. Bloomberg would eliminate the $400 property tax rebate, for an approximate savings of $250 million. He also planned to renew his call for Albany to approve legislation that would charge customers a nickel for each new plastic bag they use at most stores.

So far that measure has not gained great traction with the public, despite supporters’ claims that it is both environmentally friendly and good for the city’s bottom line. There may be other taxes or fees as well.

The tax increases are part of a broader package of tough-love measures that Mr. Bloomberg intends to outline on Friday.

He plans to slice another $1 billion in spending and will also unveil various proposals to overhaul the city’s pension system, reduce capital spending and require city employees to contribute toward their health care.

That might be a tough sell with labor unions, but the mayor plans to warn that if unions do not cooperate, the work force could shrink by as much as 23,000 through attrition and layoffs.