If the child's total "unearned" income is $2,500 or less (for 2023), "kiddie tax" does not apply, so Form 8615 is not used and information from the parents' tax return is not needed. Unearned income is investment income, including interest, dividends, capital gains, or any other income that is not from working.
So if the $2,000 of interest is the child's only income, you can just file a simple separate tax return for him. Reporting his interest income on your tax return (with Form 8814) could possibly result in paying more tax than if you file a separate tax return for him. It could increase the tax on your income. The only disadvantage of filing a separate return is that it's a little more paperwork.
If you are using the CD/Download Desktop TurboTax software, there is no extra cost for filing a separate tax return for the child. If you are using TurboTax Online you would not be able to use Free Edition for the child's return because he would need Schedule B, which is not included in Free Edition. But you should be able to use IRS Free File.
