A Labor Party tribunal has found that Fairfield councillor George Barcha should be "formally reprimanded" following allegations of branch stacking before this year's NSW election.

Cr Barcha, a former deputy mayor of Fairfield, is the secretary of Smithfield branch in the state seat of Prospect, which was won by Labor's Hugh McDermott in March.

George Barcha Credit:Wesley Lonergan

It is understood he told the tribunal that he received two signed and completed membership renewal forms from another person in January.

In a decision handed to the NSW administrative committee last week, the tribunal concluded there was insufficient evidence that Cr Barcha had filled out the renewal forms himself.