This bill introduces a new tax credit for critical employees and permanently extends and modifies the child tax credit. It aims to provide financial relief to specific professionals and enhance support for families with children, with effective dates for taxable years beginning after its enactment or after December 31, 2024, respectively. A new credit for hired critical employees is established, offering $3,500 to individuals working full-time for at least 75 percent of the year in a qualified opportunity zone . This credit applies to healthcare professionals, law enforcement officers, firefighters, rescue squad members, ambulance crew members, eligible childcare providers, and personal or home care aides . This critical employee credit is temporary, set to expire for taxable years beginning after three years from the bill's enactment. The bill also makes substantial changes to the child tax credit , permanently extending and modifying several provisions. It increases the credit amount to $3,500 for each qualifying child , with an enhanced credit of $4,500 for qualifying children under age six , and includes a $500 credit for other qualifying dependents for taxable years before 2026. The legislation adjusts the income thresholds, reducing the credit for incomes exceeding $400,000 for joint filers or $200,000 for others, and revises the refundable portion to 15.3 percent of earned income.