# 119-s-684: Tax Administration Simplification Act

119-s-684, Tax Administration Simplification Act, is a 119th Congress bill sponsored by Sen. Blackburn, Marsha [R-TN] (R-TN); status introduced; PRIA reads it as touching household money (as of 2025-12-21).

- Canonical: https://policyrisk.com/legislation/119-s-684
- As of: 2025-12-21
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: 119-s-684
- Congress: 119
- Title: Tax Administration Simplification Act
- Status: introduced
- Introduced: 2025-02-24
- Sponsor: Sen. Blackburn, Marsha [R-TN] (R-TN)
- Cosponsors: 2
- Policy area: Taxation
- Touches household money: yes
- Last recorded action: 2025-12-21

## Summary

**More flexible timing for tax elections, estimated payments, and electronic filings.** This bill would change timing rules so small businesses have more time to choose S corporation status, individuals get later mid‑year payment windows, and electronic submissions can count as on-time. - Would let small businesses make an S corporation election up to the due date of the S return, including extensions. It would also allow the IRS to accept some late revocations as timely for reasonable cause and to permit elections on timely-filed returns. - Would move two mid-year individual estimated tax installments one month later to reduce missed-payment risk. These timing changes would apply to taxable years beginning after enactment. - Would extend the mailbox rule to electronic filings and payments so transmissions sent on time but received late are treated as filed or paid on the transmission date. The electronic-mailbox rule would take effect one year after enactment and the IRS must issue implementing guidance.

## Cosponsors (2)

- Sen. Cortez Masto, Catherine [D-NV] (D-NV), 2025-02-24T00:00:00.000Z
- Sen. Warnock, Raphael G. [D-GA] (D-GA), 2025-12-16T00:00:00.000Z

## Provisions PRIA read

- Later deadline for S corporation elections: benefit, medium. This bill would let a small corporation make an S election up to the tax return due date for that year, including extensions. It would generally allow making the election on a timely filed return unless the IRS says otherwise. The IRS could issue forms and rules and may treat some late revocations…
- Later due dates for estimated taxes: benefit, low. This bill would move two quarterly estimated tax due dates. The June 15 payment would become July 15. The September 15 payment would become October 15. These date changes would apply for tax years beginning after the date of enactment.
- Mailbox rule for electronic tax filings: benefit, low. This bill would treat an allowed electronic filing or permitted electronic payment as filed or paid on the date you transmit it if you send it on or before the deadline but the IRS receives it late. The IRS would have to issue rules or guidance within one year to carry this out. The rule would appl…

## Related bills

- 119-s-5066: Health Equity and Accountability Act of 2026
- 119-s-4744: Take Care of America’s Veterans Act
- 119-s-199: A bill to amend the Internal Revenue Code of 1986 to provide special rules for the taxation of certain residents of Taiwan with income from sources within the…
- 119-s-1816: Improving Seniors’ Timely Access to Care Act of 2025
- 119-s-317: Charitable Act
- 119-s-3345: PBM Price Transparency and Accountability Act

## Sources
- [119-s-684 on Congress.gov](https://www.congress.gov/bill/119th-congress/senate-bill/684)

## Related
- [119-s-5066: Health Equity and Accountability Act of 2026](https://policyrisk.com/legislation/119-s-5066)
- [119-s-4744: Take Care of America’s Veterans Act](https://policyrisk.com/legislation/119-s-4744)
- [119-s-199: A bill to amend the Internal Revenue Code of 1986 to provide special rules for…](https://policyrisk.com/legislation/119-s-199)
- [119-s-1816: Improving Seniors’ Timely Access to Care Act of 2025](https://policyrisk.com/legislation/119-s-1816)
- [119-s-317: Charitable Act](https://policyrisk.com/legislation/119-s-317)
- [119-s-3345: PBM Price Transparency and Accountability Act](https://policyrisk.com/legislation/119-s-3345)
- [All bills in Congress](https://policyrisk.com/legislation)

Source: PRIA, https://policyrisk.com/legislation/119-s-684 (as of 2025-12-21).