An inspector general report finds that the Trump administration did not adequately analyze the economic impacts of the tax overhaul it released last month.
The report also questions the IRS’s ability to handle millions of individual tax returns that are being filed by overseas citizens.
The White House announced the tax plan last week, but it did not include a plan for taxpayers living abroad to file their taxes.
The report was released as the Trump Administration prepares to announce new tax rules.
The rules would make it more difficult for individuals to deduct the taxes they owe from their federal taxes.
They would also require more tax filing fees for many people and a reduction in the standard deduction.
The report found that the IRS did not conduct a cost-benefit analysis for the new tax provisions, and instead relied on assumptions and estimates that were not backed up by data.
The IG’s office found that it could not verify whether the IRS had adequately collected data from foreign residents, and that it did find that some tax-filers had filed the wrong returns, particularly for the child tax credit and the earned income tax credit.
The agency also concluded that the data it gathered for those credits did not properly account for the fact that the tax credits were being used as a tax credit to reduce tax payments, instead of being used to help individuals pay income taxes.
The tax plan, which would be available to all taxpayers in 2025, would repeal the tax on wages that was enacted in 2009, as well as other tax cuts that the GOP passed during its campaign.
The Tax Policy Center estimated that it would raise $1.9 trillion over 10 years from eliminating the corporate income tax and repealing the estate tax.
The IRS has already said it would review the IG report.