February 26, 2021 IRS adjusts housing expense limitations under IRC Section 911 for tax year 2021 In Notice 2021-18, the IRS provides adjustments to the limitation on housing expenses for purposes of IRC Section 911, taking into account the geographic differences in housing costs relative to those in the United States. The notice also allows taxpayers to apply a housing expense limitation for tax year 2020 if it is higher than the adjusted limitation for tax year 2021. | ||||