On July 27, a front-page story in The Post claimed that ''preliminary findings'' of the Mayor's Commission on Budget and Financial Priorities called for cutting 6,212 jobs from the District of Columbia payroll. The Post promptly endorsed the ''findings'' in an enthusiastic editorial {''6,212 Unnecessary D.C. Jobs,'' July 30}.

The commission has made no such recommendation. It will report publicly on Nov. 15. We are currently discussing a large number of possible recommendations, but we have taken no votes and made no decisions.

The mandate of the commission is to recommend a five-year budgetary plan for the District for the years 1992 to 1996. The District's economy is slowing, and revenue growth is faltering. Urgent needs for effective public services, however, continue to grow. Poverty, exacerbated by a wave of crime and drugs, has left crack babies, endangered families and desperate neighborhoods. Schools, streets and bridges urgently need repair. Partly because Congress refuses to allow the District to tax incomes earned by nonresidents, those of us who live here bear relatively high tax burdens.

The commission is working hard to come up with a sensible, constructive set of recommendations. We are aiming for a plan that will balance the budget, provide the services most needed by the District citizens as efficiently as possible and impose fair tax rates that do not endanger the District's future growth. The Post is not helping by second-guessing our deliberations or endorsing recommendations that we have not made.

ALICE M. RIVLIN Chair, Commission on Budget and Financial Priorities of the District of Columbia Washington