TurboTax:
If you have already gone through TurboTax and entered all of your information, you should be able to retrieve the total taxes owed from: My Account > Tools > Review Tax Summary > Balance Due
TaxCaster:
In case you did not go through TurboTax, you can use TaxCaster and get a quick estimate: https://turbotax.intuit.com/tax-tools/calculators/taxcaster/
Additional Information:
"Estimate the amount of taxes you will owe for the year. Simply subtract the total tax withheld from your paycheck and your estimated tax payments from the amount of tax you owe. Before estimating your tax liability, be sure to reduce your income by all exemptions and deductions you anticipate claiming.
You can then estimate the tax you owe by using the tax tables in the instructions to your tax return. If you plan on using a tax credit, don't forget to reduce the tax you owe by the credit. If you still owe tax, it's wise to include a payment when requesting the extension. If you pay too little, you may owe interest and penalties."
https://turbotax.intuit.com/tax-tools/tax-tips/Tax-Extensions/How-Do-I-Get-an-Extension-on-Taxes-/IN...
