Filed extension with IRS and made $1500 online payment as precaution. Not sure how to get that payment to reflect on either return for 2016 or 2017.

[HelenaC · Accepted solution]

If you filed an extension for tax year 2016, enter the amount as follows:

• Federal Taxes (with Self employed version, Personal)
• Deductions and Credits
• Estimates and Other Income Taxes Paid
• Scroll down to Payments with Extension.

See the screenshot below.

See also Where do I enter my estimated tax payments?