Paid amended tax due online, do I need to add the payment to 1040x

[cathiexu]

Hi All,

I'm filing 1040x for 2021 amend and found I have tax due (assume $100).  On the IRS website it says I could pay due online with payment type "amend".  

Let's say, on my current 1040x generated by turbotax, line 20( Amount you owe) is $100, and I now make $102 (considering interest etc) online.

How should I let IRS know that I have already paid tax due online for this amendment? Should I take an extra step by adding $102 to any line of 1040x and eventually show the amount due is $0 as I don't owe anything to the IRS?

Or, just keep my 1040x as it is now and mail directly? 

Many thanks to your consistent guidance!

Thanks

[fanfare]

When you pay the "amount you owe" selecting "Amended Return", you are done.

Do not try to calculate interest or penalties, IRS will calculate it and send you a bill.

@cathiexu 

[cathiexu]

@fanfare 

To be more specific, my question is actually, once I make this payment online, should I reflect this payment anywhere on 1040x? or just keep 1040x as it is (showing $100 tax due)? 

[dmertz]

" once I make this payment online, should I reflect this payment anywhere on 1040x? or just keep 1040x as it is (showing $100 tax due)? "

No.  When you make an online payment, the IRS knows that you paid.  The tax liability and payment information is aggregated in your tax account.  A transcript of your tax account is available online:

https://www.irs.gov/individuals/get-transcript

Of course the tax liability from your amended tax return won't be present in your tax account until they process the amendment, so the payment will typically be in your tax account well before the corresponding liability from the amendment shows up.

[An2425]

Thanks @dmertz   Im doing research and I have a hypothetical question similar to this situation, I’m hopeful you can help. 

let’s say this year I file my normal tax return in march 2025. In early April,  I notice that I missed something that increases my tax liability, but my return hasn’t been accepted yet. Since I know I shouldn’t file an amendment until the original return is processed, could I at least pay the amount I know I additionally owe online right away?  Would this make it so I don’t have to pay interest - Even tho the date I submit my amendment is after April 15th?  Or is the most important thing the IRS looks at the date of filing the amendment to if you owe interest?  

[dmertz]

I'm not sure how you would make an additional payment for 2024 without associating it with a Form 1040 or Form 1040-X.  I think I would just file the Form 1040-X even though the original tax return might not have been processed by the time the IRS receives the Form 1040-X.  The credit to your tax account will happen when they receive and process the payment, but it will likely take weeks to months to actually process the Form 1040-X, long enough for the original tax return to have been processed.

The only issue I can see is if the IRS detects underreporting of income and assesses the additional tax themselves.  They might recognize that the additional amount has already been credited to your tax account and will only need to bill for interest.

[An2425]

That’s a good idea to just file the amendment anyways so it can be noted as sent before April 15th. 

If that was done, would there be no interest to deal with, since the amendment was filed by the due date?  Or do they just look at when they process the amendment (which doesn’t seem fair if you filed it in time). 

[fanfare]

To avoid penalties, pay the "amount you owe", however/whenever  determined, on or before April 15th Tax Day.

It is fairly easy to pay on the IRS "Make a Payment" page.

@An2425