WASHINGTON (AP) — The IRS is still too slow in processing amended tax returns, answering taxpayer phone calls and resolving identity theft cases, according to an independent watchdog within the agency.

The federal tax collector needs to improve its processing and taxpayer correspondence issues despite a massive boost in funding provided by the Democrats' Inflation Reduction Act, according to an annual report Wednesday to Congress from Erin M. Collins, who leads the organization assigned to protect taxpayers' rights under the Taxpayer Bill of Rights.

The report serves as a reality check of sorts as IRS leaders say the funding boost is producing big improvements in services to taxpayers. GOP critics, meanwhile, are trying try to claw back some of the money and painting the agency as an over-zealous enforcer of the tax code.

The IRS is experiencing "extraordinary delays" in assisting identity theft victims, taking nearly 19 months to resolve self-reported cases, which the report calls "unconscionable" since a delay in receiving a refund can worsen financial hardships.

Additionally, the backlog of unprocessed amended returns has quadrupled from 500,000 in 2019 to 1.9 million in October last year. And taxpayer correspondence cases have more than doubled over the same period, from 1.9 million to 4.3 million, according to the report.

The report also says IRS employees answered only 35% of all calls received, despite the agency claiming 85%. The IRS doesn't include calls where the taxpayer hangs up before being placed into a calling queue.

And while the agency has been on a hiring spree — thousands of workers since 2022 — the new employees are in need of proper training, the report says. The 2023 Federal Employee Viewpoint Survey shows that a quarter of IRS employees don't think they receive adequate training to perform their jobs well.

"It is critical that the IRS make comprehensive training a priority and ensure that new hires receive adequate training before they are assigned to tasks with taxpayer impact," Collins said.

IRS Commissioner Daniel Werfel said in a statement that the Taxpayer Advocate "raises a number of very important areas that we are looking at to make improvements" with Inflation Reduction Act funding.

"Many of these issues identified in her report ultimately depend on adequate IRS resources," he said. "This is another reason why the Inflation Reduction Act funding and our annual appropriations are so critical to making transformational changes to the IRS to help taxpayers and the nation."

The federal tax collection agency originally received an $80 billion infusion of funds under the Inflation Reduction Act but that money is vulnerable to potential cutbacks.

Last year's debt ceiling and budget cuts deal between Republicans and the White House resulted in $1.4 billion rescinded from the agency and a separate agreement to take $20 billion from the IRS over the next two years and divert those funds to other nondefense programs.

Collins said in the report that she believes some of the law's funding that was provided for enforcement should be redirected to improving taxpayer services "to enable the IRS to make the changes necessary to transform the taxpayer experience and modernize its IT systems in the next few years."

"I encourage the IRS to put more emphasis on reducing its paper processing backlog in 2024," Collins said in her report.

The report comes shortly after the IRS announced that the 2024 filing season begins on Jan. 29. Agency leaders say better customer service and tech options will be available to taxpayers and most refunds should be issued in less than 21 days.

The agency has been pulling itself out of decades of underfunding — by the end of the 2021 filing season, it faced a backlog of over 35 million tax returns that required manual data entry or employee review.

Last April, IRS Commissioner Daniel Werfel released details of IRS plans to use its IRA money for improved operations, pledging to invest in new technology, hire more customer service representatives and expand the agency's ability to audit high-wealth taxpayers.

Additional money for the IRS has been politically controversial since 2013, when the agency during the Obama administration was found to have scrutinized political groups that applied for tax-exempt status. A report by the Treasury Department's internal watchdog found that both conservative and liberal groups were chosen for close review