Tony Fisher, a candidate for Montgomery County sheriff, charged yesterday that the county has lost $30,000 in interest in the last two years because the incumbent sheriff, James Young, failed to transfer money promptly to the county treasury.

County finance director Albert Gault agreed that the county has lost about $30,000 over the last two years because of irregular transfers of money from the sheriff's office, but he said that Young's office now is up to date in its transfers and has agreed to make weekly transfers. On July 1, the office will begin making daily deposits into the county's treasury, he said.

"We are happy that the sheriff has agreed to turn over the money as quickly as possible so that we can get it invested," said Gault.

Fisher accused the sheriff of "financial neglect and abuse," saying that Young had not handled properly the $40,000 a month in fees collected by deputies serving official papers.

"It is unconscionable to me that in a time when loyal county employes are asked to leave their jobs . . . and to forgo raises, this type of mismanagement could happen," Fisher said at a press conference.

Sheriff Young acknowledged that regular transfers of collected funds had not been made, but said the problem has been corrected. "The problem was not the result of poor management," said Young. "The problem has all been straightened out. And we have set up procedures so it won't happen again."

According to Gault, Young's office transferred to the county treasury $208,000 between December and April -- money collected months earlier, from April through September 1981. Another $180,000 was turned over to the county recently, bringing the transfers up to date.

Fisher, a Democrat, has asked the Maryland Attorney General and the County Council to investigate the money-handling procedures in his opponent's office.