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.
You are not required to make estimated payments for 2017 if:
You will pay or expect to pay (through withholding or other)
100% of 2016's taxes paid (110% if AGI is more than $150,000) or 90% of the 2017 taxes due.
See link below for when paying estimated taxes is a good
planning.
https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs
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