When to Pay Estimated Tax

For estimated tax purposes, the year is divided into four payment periods. Each period has a specific payment due date. If you don't pay enough tax by the due date of each payment period, you may be charged a penalty even if you're due a refund when you file your income tax return at the end of the year.

You may send estimated tax payments with Form 1040-ES by mail, pay online, by phone or from your mobile device using the IRS2Go app.

When to Pay Estimated Tax

Payment Period	Due Date
January 1 – March 31	April 15
April 1 – May 31	June 15
June 1 – August 31	September 15
September 1 – December 31	January 15* of the following year.

https://www.irs.gov/faqs/estimated-tax