2018 3rd Quarter Estimated Tax Payments are due on September 17, 2018. Instructions and a payment voucher can be found here. Checks should be written to the United States Treasury with Form 1040-ES listed on the memo line along with the taxpayer’s social security numbers. When to Pay Estimated Taxes: 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.
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