WASHINGTON — The Trump administration has delayed the release of detailed IRS data that could show how the 2025 Republican tax law is affecting taxpayers, leaving the figures unpublished months after their scheduled release as the administration promotes the law ahead of the midterm elections. The data is expected to identify which tax breaks people in different income brackets claimed and provide information about how much they paid in taxes. It could offer the first detailed accounting of how taxpayers are using provisions in the One Big Beautiful Bill Act, including new deductions for overtime wages and tipped income. The IRS had planned to publish filing-season statistics in July and update them in September as more returns were processed. Neither release has appeared. The agency says it is awaiting Treasury Department approval to publish the figures. The delay has drawn criticism from people who say the administration is withholding routine tax-data releases. The administration has said its priority is to publish accurate and reliable IRS information, but the data could help the public assess who is benefiting from the law and how its tax provisions are being used. With the figures still unreleased, voters and policymakers have yet to see that detailed breakdown as the administration makes the tax law part of its midterm message.