How do I file?

[jmkosiorek]

My son is 19 years old and has never had a job. In 2021 he earned interest income from a court case he won, and has a 1099-INT form. The interest amount is $1,423. I claim him as a dependent on my taxes. 

What does he need to do regarding paying taxes for this interest income?

[AmyC]

If certain conditions apply, you can elect to include on your return the income of a child who was under age 19 at the end of 2021 or was a full-time student under age 24 at the end of 2021. To do so, use Form 8814. If you make this election, your child doesn't have to file a return. For details, use Tax Topic 553 or see Form 8814. See Do I need to report my child's 1099-INT on my return?

[jmkosiorek]

Wouldn't I pay more taxes on my childs interest income, than he would, if I include it on my taxes?

[jmkosiorek]

and he was not under age 19 at the end of 2021, he was 19 years old

[AmyC]

You do not have to file it. It is just often easier; but, at 19, he can certainly file his own return. We have a free version that he may qualify to use. See TurboTax Free Edition