Of course if you just use the safe harbor option you can base it off the 2017 tax liability when you have completed the 2017 return ...
How does TurboTax calculate my estimated tax payments?
https://ttlc.intuit.com/replies/3301730
Can TurboTax calculate next year's
federal estimated taxes?
https://ttlc.intuit.com/replies/4242911
Can TurboTax calculate the estimated
payments for next year's state taxes?
https://ttlc.intuit.com/replies/3301735
