Schedule 5 totals show up on Line 17 of 1040. Schedule 5, has a line 71 for extension payments. Reply to self: Form 1040 is much shorter for 2018 and then it refers to a bunch of schedules. Click on Jump to federal extension payment Or enter federal extension payment in the Search box located in the upper right of the program screen. On the next screen select the type of extension payment made and click on the start or update button

On Other Income Taxes, click on the start or update button.

Scroll down to Estimates and Other Taxes Paid.

Click on I'll choose what I work on (if shown).

Click on Federal Taxes (Personal using Home and Business).

To enter, change or delete a payment made with an extension request (Federal, State, Local).

The payment made with the extension request will be included on your tax return as a tax payment, Form 1040 Line 70, Form 1040A Line 46. You can check to see if the amount is on your tax return by clicking on My Account at the top of the program screen. Provided you used the same user ID for the 2016 online tax return as was used to use Easy Extension. If you used the TurboTax Easy Extension to electronically file the extension request, Form 4868, and make the tax payment with the request, the payment should already entered on your tax return.

Irs 2016 extension form 4868