In News Release IR-2019-01 the IRS announced that it will begin processing tax returns this year on January 28, 2019 and, despite the partial government shutdown, will issue refunds that may be due on returns filed this year.

The release notes:

As in past years, the IRS will begin accepting and processing individual tax returns once the filing season begins. For taxpayers who usually file early in the year and have all of the needed documentation, there is no need to wait to file. They should file when they are ready to submit a complete and accurate tax return.

In previous shutdowns the IRS had been directed not to pay refunds during a lapse in appropriations.  However, the release notes:

Congress directed the payment of all tax refunds through a permanent, indefinite appropriation (31 U.S.C. 1324), and the IRS has consistently been of the view that it has authority to pay refunds despite a lapse in annual appropriations. Although in 2011 the Office of Management and Budget (OMB) directed the IRS not to pay refunds during a lapse, OMB has reviewed the relevant law at Treasury’s request and concluded that IRS may pay tax refunds during a lapse.

The IRS announced that a significant number of IRS employees will be recalled back to work:

The IRS will be recalling a significant portion of its workforce, currently furloughed as part of the government shutdown, to work. Additional details for the IRS filing season will be included in an updated FY2019 Lapsed Appropriations Contingency Plan to be released publicly in the coming days.

“IRS employees have been hard at work over the past year to implement the biggest tax law changes the nation has seen in more than 30 years,” said Rettig.

The news release also reminds taxpayers of the due dates for the 2018 income tax returns:

The filing deadline to submit 2018 tax returns is Monday, April 15, 2019 for most taxpayers. Because of the Patriots’ Day holiday on April 15 in Maine and Massachusetts and the Emancipation Day holiday on April 16 in the District of Columbia, taxpayers who live in Maine or Massachusetts have until April 17, 2019 to file their returns.