"The IRS on Tuesday initiated its contingency plan for the federal government shutdown Oct. 1. The 61-page plan covers preparation for a shutdown, implementation, and reactivation of functions, but it anticipates a government shutdown of no more than five days. A longer shutdown would require a reassessment by the IRS deputy commissioner for operations support. With the Oct. 15 deadline for individual returns on extension approaching, most tax return processing would continue during the shutdown.
Certain IRS activities would continue during a government shutdown, including activities funded with appropriations that do not expire at the end of the government’s fiscal year, functions that are authorized by statute to occur in advance of appropriations, and certain other activities that are required by duties imposed on the IRS. The IRS gives as an example of the latter category the design and printing of next year’s tax forms and the completing and testing of next filing season’s programs.
Nonexcepted functions, which would shut down, include IRS headquarters and administrative functions, audits and examinations, processing of paper returns that do not include remittances, legal counsel, and taxpayer services. The IRS expects 90% of its employees (almost 86,000) to be furloughed during a government shutdown."