Tax Administration Simplification Act

This legislation aims to make tax filing and payments simpler and clearer. It says that when you send a tax form or payment online, the day you hit “send” counts as the official filing or payment date, even if the IRS looks at it later. It also gives small businesses more time and flexibility to choose (or revoke) S corporation status. And it moves two of the quarterly estimated tax deadlines for individuals one month later in the year.

Key points

• Who is affected: People who file or pay taxes online; small businesses considering S corporation status; individuals who make quarterly estimated tax payments.
• What changes:
  • Online “send date” counts as the official filing/payment date; IRS guidance due by December 31, 2025.
  • Small businesses can make an S corporation election by the tax return due date (including extensions); the IRS can accept late elections for reasonable cause; similar flexibility for revoking an election.
  • Estimated tax due dates shift from June 15 to July 15, and from September 15 to October 15.
• When it starts:
  • Online filing/payment “send date” rule applies to items sent after December 31, 2025.
  • S corporation election changes apply to tax years starting after December 31, 2025; revocation flexibility applies after enactment.
  • New estimated tax due dates apply for tax years beginning after December 31, 2025.