Tax return preparers will have to pay attention to an amendment added in the Senate version of the Worker, Homeownership, and Business Assistance Act of 2009, which extended the First Time Homeowner Credit and unemployment benefits, because beginning in 2010, this amendment will require tax return preparers to file any individual tax return electronically unless the preparer expects to file fewer than 10 returns in a calendar year. This means that individual tax return preparers will be required to apply for an EFIN, the Electronic Filing Identification Number, which will help the Internal Revenue Service (IRS) to track their returns. The requirement applies to individual tax returns, estate, and trust returns. Note: This new law does not affect 2009 tax returns filed in 2010.