I forgot to include form 8606 for non-traditional IRA contribution and backdoor Roth IRA conversion

[MK100]

In 2001, I made a non-deductible contribution of $6000 into my IRA account and then backdoor $6000.01 into my Roth IRA. There was $0 basis before 2021. 

My questions are

1) Do I need to file 1040x? Or I only need to file delinquent 8606? I know there are different mailing address for thise two forms.

2) Since I backdoored $6000.01 to my Roth and I only contributed $6000 after tax money, so I actually owe tax on this $0.01 (taxable amount calculated in form 8606). Do I need to file 1040x for this additional 1 cent taxable amount? 

[fanfare]

The proper way to file Form 8606 is attached to Form 1040-X.
Form 8606 can be mailed by itself only when you are otherwise not required to file a tax return.

Do you have the correct taxable amount on Line 4b?
After you e-File,
get Form 1040-X from IRS website and mail it in with your 8606, which you can also get in fillable PDF.
Note: since you are not changing any dollar amounts on your amended tax return, you can leave all the lines 1-23 EMPTY.

Part III explanation: "didn't include Form 8606 with e-File".

Done this way, you sign 1040-X, not 8606

@MK100 

[fanfare]

when doing  a Roth conversion on form 8606, do not include pennies.

round to the nearest dollar.

@MK100