The Tax Administration Simplification Act makes four key changes to federal tax administration rules. First, it extends the "mailbox rule"—which currently protects timely paper filings—to electronic submissions, meaning documents and payments sent electronically to the IRS will be treated as received on the date sent, not when the IRS actually receives them (effective January 1, 2026). Second, it expands the deadline for S corporation elections to the tax return due date plus extensions, and allows the IRS to grant relief for late elections if reasonable cause exists. Third, it updates S corporation revocation rules with similar flexibility. Fourth, it delays the quarterly estimated tax payment deadlines for individuals by one month each, moving the second and third quarterly payments from June 15 and September 15 to July 15 and October 15 respectively (effective for tax years beginning after 2025). The bill has no specified federal funding and was introduced by a bipartisan group of House members in February 2025.
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