2018 1st quarter estimated taxes are due 4/17/18. 2017 tax return is also due 4/17/18, although you may file for an extension to file. The extension allows you 6 more months to file your 2017 return.
However, it does not extend the time to pay any taxes due (including an underpayment penalty if applicable). If you have a 2017 tax liability, it is due 4/17/2018. You can pay the 2017 tax liability and the 2018 1st Quarter estimated taxes directly on the IRS website.
IRS direct pay
See the link below for the 2018 estimated tax vouchers.
1040-ES vouchers and instructions
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