The IRS interest rates on overpayments and underpayments for the second quarter of 2023 are the same as the rates for the first quarter of 2023 (Rev. Rul. 2023-4). The rates beginning April 1, 2023, are:
The tax on the investment income in excess of $1,700 (may change after 2007) of a child under age 18, based on the parents’ marginal tax rate and computed on Form 8615.