Where do I find the tax liability on the 2019 1040-SR? What line?

[cratzlaf]

It's line 24 on the 1040, but that line on the 1040-SR is the tax penalty.

[KrisD15]

On the 2019 1040SR your tax liability is on line 16

[cratzlaf]

Thanks, KrisD. Unfortunately, I even more confused now. Your answer makes sense, but I chatted with a live expert before getting this response, and was told that if I didn't have an additional form from last year (I forget the form number), I should put 0 as the tax liability. Before I attempt an amended return, I'd like to know which expert is correct.

[VolvoGirl]

The 1040SR has the exact same line numbers as the regular 1040.  What do you need the tax liability for?

2019 compare them

1040  https://www.irs.gov/pub/irs-prior/f1040--2019.pdf

1040SR  https://www.irs.gov/pub/irs-prior/f1040s--2019.pdf

[VolvoGirl]

The total tax liability on line 24 is for 2020 returns.  For 2019 it is on line 16 on both the 1040 and 1040SR.

[fanfare]

refer to your original and revised 1040 tax returns for the amounts to enter on Form 1040-X.

You can't just enter arbitrary amounts.

Don't file an incorrect Form 1040-X.