The Taxpayer Assistance and Service Act, or TAS Act, seeks to significantly enhance the services provided by the Internal Revenue Service (IRS) and improve overall tax administration. A core focus is on modernizing IRS operations through digitization of tax returns and correspondence using optical character recognition technology. The bill also mandates the establishment of a public dashboard to inform taxpayers of backlogs and wait times for phone services and processing, promoting greater transparency. To expand electronic access, the legislation requires the IRS to provide individualized, specific, and up-to-date information on tax returns and refunds via a website and mobile application. It also calls for the expansion of callback technology and online accounts, allowing taxpayers and their authorized representatives to view and respond to IRS documents electronically. The bill introduces measures to provide relief for certain taxpayers, such as automating refund offset bypass for low-income individuals and eliminating installment agreement fees for those below 250 percent of the poverty level. Further taxpayer protections include informing individuals facing economic hardship about collection alternatives like offers-in-compromise and "currently not collectible" status. The bill mandates quarterly notices to taxpayers with delinquencies, estimating penalties and interest, and directs the National Taxpayer Advocate (NTA) to have direct hire authority for attorneys and enhanced access to IRS information and meetings. It also repeals the limitation period suspension for taxpayers seeking assistance from the Taxpayer Advocate Service. Significant changes are made to judicial review processes, including granting the Tax Court subpoena authority before hearings to facilitate settlements and clarifying its power to grant relief from judgments. The bill expands the types of cases Special Trial Judges can hear and applies federal judicial disqualification rules to Tax Court judges. It also provides for de novo review of innocent spouse relief and clarifies that certain court filing deadlines are non-jurisdictional, allowing for equitable tolling. The legislation modifies procedural requirements for penalties and multi-year credit disallowance periods, requiring supervisor approval and providing taxpayers with appealable notices. It authorizes the Tax Court to issue refunds in collection due process cases and to hear suits for refunds or credits up to $2 million. The threshold for small tax disputes in the Tax Court is increased to $100,000 , making it easier for more taxpayers to resolve disputes efficiently. To address misconduct, the bill significantly increases penalties for tax return preparers who improperly alter returns or fail to provide valid preparer identification numbers (PTINs). It establishes a new criminal penalty for willful failure to provide a valid PTIN and grants the IRS authority to deny, revoke, or suspend PTINs based on suitability, education, or disreputable conduct. The IRS is also required to publish common errors and penalties related to preparers. The bill enhances whistleblower protections by allowing de novo Tax Court review of award determinations, exempting awards from sequestration, and ensuring whistleblower anonymity. For American citizens abroad, it mandates studies on simplifying foreign reporting and increases the threshold for simplified foreign tax credit rules. Small businesses benefit from provisions allowing voluntary withholding agreements for independent contractors and a failure-to-pay penalty safe harbor for individuals who pay 125% of their prior year's tax liability.