Other tax payments: where to show on 1040 tax return?

[deetrumpet]

Question: I made an online 'balance due' payment a few weeks before I started preparing my 2023 individual 1040.  Where should I show this 'balance due' payment on my 2023 return? 

Details:  On March 14, 2024, I made a $6,000 IRS Direct Pay online payment allocated to tax year 2023. From my point of view, this was the equivalent of a fifth estimated tax payment. The online payment form did not offer an option to designate this payment as 'estimated tax.' (Probably this is because March 2024 was too late to be making an estimated tax payment for 2023.) The online form instructed me: 'If none of these categories applies, check the box for 'Balance Due.' I obeyed that instruction.  Now (March 27) I am preparing my 2023 tax return. I cannot figure out where to enter the $6,000 'balance due' payment on my 1040. (My tax return will result in a $2,000 refund.)

[MinhT1 · Accepted solution]

In TurboTax Online, on the quarterly payments page, at the bottom, there is +Add Another Payment button. Click on it, and another line will appear where you can add another payment of estimated taxes.