No, they are not mandatory. You may disregard the vouchers if
you believe they will not apply to your 2017 tax situation. The vouchers print
automatically when the software detects a spike in income for the year, or if
you didn't have enough withheld for the year.
https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs
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