I completed my returns for 2018 and then sold some stock. Now I will need to estimate taxes for 2019 and make tax payments for the gains.
Please see the FAQs below for guidance in filing estimated tax payments for tax year 2019.
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
You can also get payment vouchers from irs.gov at 2019 Form 1040-ES.
The above links explain estimating 2019 taxes while preparing 2018 returns. I'm asking, how to do the same once 2018 taxes are already filed?