SESK: Stuff Everyone Should Know · sesk.info/biz-estimated-tax-april-15
When is the first estimated tax payment of the year generally due?
April 15, for income from January 1 to March 31.
- January 31
- March 15
- April 15 ✔
Why: The first payment period runs January 1 to March 31, and its payment is due April 15. If a due date lands on a weekend or holiday, the next business day counts as on time.
Huh, didn't know that: A mailed payment counts as paid on the date of the U.S. postmark.
Why did the fraction worry about marrying the decimal? It would have to convert.
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References
Answer: April 15. The first payment period runs January 1 to March 31, and its payment is due April 15. If a due date lands on a weekend or holiday, the next business day counts as on time.
- IRS: Pay as you go, so you won't owe www.irs.gov/payments/pay-as-you-go-so-you-wont-owe-a-guide-to-withholding-estimated-taxes-and-ways-to-avoid-the-estimated-tax-penalty
April 15 for income earned January 1 to March 31
Checked 2026-10-11.
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