Taxpayer Transparency and Notice Act

Would require the IRS to send quarterly notices to taxpayers with unpaid tax balances. The notices would replace the annual notice framework and must include an estimate of penalties and interest that could accrue if the delinquent tax is not fully paid within the remaining time under section 6502(a). Notices would also provide information on programs and services that can help taxpayers. The quarterly requirement would not apply while an installment agreement under section 6159(a) or an accepted offer-in-compromise under section 7122 is in effect or when the tax is determined not collectible under section 6343(e). The amendments would take effect 24 months after enactment and include a conforming change to the Chapter 77 table of sections.