The MTA wants to slim down — ever so slightly.

A set of proposals to cut bureaucratic fat off the transit authority’s $18 billion operation would reduce the size of the massive 75,000-person agency by just 3 to 4 percent, or 1,900 to 2,700 staffers, according to the report from consultant AlixPartners released on Wednesday.

The proposals — which focus on eliminating duplicate work between the MTA’s subsidiary agencies — will save $370 to $530 million annually, or 3 percent of its annual operating budget, agency officials said.

Transit officials said the agency faces an operating deficit of nearly $1 billion by 2022.

AlixPartners’ report, unveiled in preliminary form on Friday, recommends relocating budgeting, human resources, legal, engineering, procurement, and external communications operations to MTA headquarters.

A majority of the 1,900 to 2,700 job cuts will come from those “support functions,” currently dispersed across the MTA’s five subsidiary agencies, as well as MTA headquarters, an official told the Post.

Initial job cuts will come from “vacancies and attrition,” not layoffs, the official said. The agency declined to say whether union jobs would be on the chopping block, though the report notes that “civil service reform may be needed.”

The recommendations reflect proposals put forward by Gov. Andrew Cuomo when Mayor Bill de Blasio signed onto congestion pricing in February.

On Wednesday, however, the governor distanced himself from the consultant plan, criticizing it for not addressing subway homelessness and not including hard deadlines.

“To have no performance measures or goals or dates is a fatal flaw in the report, especially for the MTA where they never meet a deadline or a date,” Cuomo told reporters at an unrelated press conference.

“They don’t even understand the meaning of the word deadline.”

Last Friday’s initial release of the consultant recommendations drew widespread criticism from transit and good government advocates, who griped that the plan would marginalize popular buses and subways chief Andy Byford.

Additional reporting by Ruth Weissmann