D.C. City Councilman Marion Barry, who is campaigning for mayor as "Mr. Tax Reform," yesterday introduced two measures that would use surplus tax revenues to expand jobs for unemployed youths and reduce income taxes for moderate-income households.

Introduced at the close of council business, both proposals are scheduled to be heard by the full council at its last summer legislative session today. The council will not meet again until Sept. 19.

Both Council Chairman Sterling Tucker and Mayor Walter E. Washington, Barry's main opponents in the Democratic primary race, were unavailable for comment yesterday evening.

Barry's bills are among several tax measures the council plans to consider today. One other bill contains property tax reductions and was advocated months ago by both Mayor Washington and Barry. It would lower rates for residential property from $1.83 to $1.34 or each $100 of assessed value. Barry has additional proposal that would provide an expanded income tax credit for homeowners and renters earning less than $20,000 a year.

Barry said yesterday evening that he did not view his latest proposals as a political maneuver. "No, I promised I would do this some time ago," he, Edward Meyers, Barry's executive assistant on the council, telephoned a reporter to alert him to the introduction of the legislative proposals after they were filed with the council's secretary's office at 5:30 p.m.

The proposals would siphon off funds from an expected budget surplus of $37 million for the 1979 fiscal year, which begins next Oct. 1. The proposals include $18.5 million for a youth employment program and income tax reductions for persons of moderate, middle and upper-income.

The youth program, divided into a summer program and a year-around program for out-of-school teenagers, would provide summer jobs next year for 15,375 youths and 1,000 jobs for school dropouts beginning this fall, according to Meyers. Teenagers employed in the summer program would earn $700 and school drop-outs $6,500.

Persons earning less than $5,000, under Barry's income tax prposal, would pay no tax at all. At present, individuals in this income bracket pay from 2 percent to 6 percent of their taxable income in income taxes to the city.

Persons earning between $5,000 and $8,000 in taxable income would have their tax rate reduced from 7 percent to 6 percent. Income over $25,000 would be taxable at a 10 percent rate instead of the present 11 percent.