The Internal Revenue Service will issue refunds to taxpayers even if the U.S. government shutdown extends into the filing season, a decision that may reduce political pressure on Congress and President Donald Trump to reach a deal to re-open the federal government.

“Tax refunds will go out,” the acting director of the White House Office of Management and Budget, Russell Vought, told reporters at a Jan. 7 briefing.

In previous shutdown contingency plans, the IRS would accept tax returns during the filing season, but refunds would be delayed until the government was funded. Vought said the administration is fixing what...