May 10
File Form 941 for the first quarter if you timely deposited all required payments.
June 15
* Individuals living outside the U.S.: File Form 1040. For automatic 4 month extension file Form 4868 and deposit estimated tax.
* Pay the second installment of 2018 estimated tax -Use Form 1040-ES.
* Corporations: Deposit the second installment of your 2018 estimated tax.
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