WASHINGTON — The federal tax filing season will run from Jan. 24 to April 18 this year, the Internal Revenue Service said on Monday, warning in its announcement that staffing shortages and paperwork backlogs could make for a messy and frustrating experience for taxpayers.In a briefing on Monday, Treasury Department officials said that the I.R.S. would struggle to promptly answer telephone calls from taxpayers with questions and that a lower level of service should be expected. They blamed Republican legislators, who have blocked efforts to increase funding at the agency, for the lack of resources.The Biden administration has asked for an additional $80 billion over a decade for the I.R.S. to bolster its enforcement and its customer service capacity, raising its staff by nearly 87,000 employees and upgrading its technology. That request is part of the administration’s Build Back Better Act, which is stalled in Congress. The Treasury Department estimates that enhancing the enforcement powers of the I.R.S. could yield the …
