Notice 2020-13, page 502.

Notice 2020-13 provides for adjustments to the limitation on housing expenses for purposes of section 911 of the Internal Revenue Code for the 2020 tax year. These adjustments are made on the basis of geographic differences in housing costs relative to housing costs in the United States. If the limitation on housing expenses is higher for the 2020 tax year than the adjusted limitations on housing expenses provided in Notice 2019-24, qualified taxpayers may apply the adjusted limitations in this notice for the 2020 tax year to their 2019 tax year.