Cost base of mined crypto if AGI is below income threshold

[gmntr40]

Let's assume my known AGI for 2019 is $7500 of wages income and my income threshold for federal filing was $12000. I could have skip the filing, but let's assume I filed a federal return reporting the $7500.

One year later I found out that in 2019 I also had a $2000 taxable income from hobbyist crypto mining.

Was I required to report the $2000 income on my 2019 return, since I reported another income?

Am I required to file an amended return for the year 2019 reporting the additional income, if I want to avoid consequences?

Would the cost base of the 2019 mined crypto change depending of whether I file the amended 2019 return?

[gloriah5200]

Yes, you are required to amend your return to file an correct and accurate income tax return.  Your cost basis should be the same, your cost basis, whether you file a return or don't file a return and does not change.

You are required to include all income on your US return if you are a resident/citizen of the U.S. if meet the requirements to be required to file a return.

If you file a return, even if you are not required to file a return, then you must include all income on it.  You cannot pick and choose what income to include.e.