The Safe Harbor Rule First: Why Last Year's Tax Return Beats This Year's Math

Name: Safe Harbor Rule: Beat the Q3 Estimated Tax Deadline
Uploaded: 2026-09-11T18:43:48.301Z
Description: Pay 100% of last year's tax across the four dates and the underpayment penalty cannot reach you. How the safe harbor rule works before September 15.

September 11, 2026

The safe harbor rule puts the underpayment penalty out of reach: pay 100% of last year's total tax, split across the four dates. What the rule requires before September 15.

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Video: Safe Harbor Rule: Beat the Q3 Estimated Tax Deadline