Q. Re: Am i required to file tax? (bank interest, stocks, dividend)
A. No. You heard correctly, that you need to have at least $12400 to file tax for single. That assumes you can not be claimed as a dependent on someone else's tax return. If you can, the filing requirement is only $1100.
There's another thing to be aware of. Stock brokers issue a form 1099-B for the sale. The IRS gets a copy. If the 1099-B does show the gain or loss (that is, it only shows the gross sale amount) there is a chance of receiving an IRS notice of failure to report. But, that is easily explained.
As others have said, for 2020, there is the stimulus payment to consider.
