What would happen to American fertility if the child tax credit were appreciably increased? Many are skeptical of the influence of cash transfers on fertility, but that skepticism is misplaced. Cash-for-kids works. It is relatively cost-effective, and its fertility effects help families achieve their own stated family goals. The pronatal outcomes of an increased child tax credit are a good reason to support such an investment.

Key Findings:

• Financial incentives—such as child tax credits—can indeed boost fertility by a demographically significant degree, and have done so in many contexts around the world.
• We suggest raising the nonrefundable child tax credit (CTC) to $2,000 and making it claimable against payroll taxes, raising the refundable additional child tax credit (ACTC) to $2,500, and indexing both values to keep up with inflation.
• This reform to the child tax credit could plausibly boost fertility by 3–10%, raising U.S. population in 2100 by at least 5 and perhaps as much as 35 million people. 
• This plan would also increase incentives for parents to marry and increase incentives for parents to work, creating not only more births, but stronger families.