The Internal Revenue Service should consider providing additional guidance to advisors to help curb missing or incorrect taxpayer identification numbers on Form 1099-MISC, according to a report from the 2009 Information Reporting Program Advisory Committee. The committee's report, which covered a large number of issues, said that there about 2 million payees that had the problem in the last filing year. And IRPAC said the IRS should immediately issue guidance permitting payers to mask all but the last four numbers of TINs on payee statements