Child Evidence

Refundable income transfers to working families — exemplified by the E · Child Evidence

income-support policy / refundable tax credits

Refundable income transfers to working families — exemplified by the Earned Income Tax Credit — causally improve children's outcomes: quasi-experimental studies using EITC expansions find higher math and reading achievement, better infant health (higher birth weight, less low birth weight), and improved later health, with larger effects for the most disadvantaged families and for Black mothers.

For the Court

Established that EITC income modestly but causally improves children achievement and infant health, with larger effects for the most disadvantaged; debate concerns the per-dollar magnitude and the dominant mechanism.

What This Claim Does NOT Say

Does not claim large effects; gains are modest per dollar, though meaningful at scale.
Does not establish that every outcome improves; some short-term child-health measures show mixed or null results.
Does not isolate income alone as the mechanism; the EITC also changes maternal employment, prenatal care, and health-insurance patterns.
Does not generalize to all transfer designs; effects may differ for unconditional or differently-timed transfers.

Scope — Where It Holds

Identified from instrumental-variables and difference-in-differences designs exploiting federal and state EITC expansions (Dahl & Lochner 2012; Hoynes 2015; Komro 2019; Braga 2020). Effects are modest per dollar but causal and concentrated among disadvantaged families; some short-term child-health outcomes show mixed or null results.

Sources & Verification

Seminal

Dahl, G. B., & Lochner, L (2012). The impact of family income on child achievement: Evidence from the Earned Income Tax Credit. American Economic Review.
Observational
A $1,000 increase in income (instrumented by EITC) raised combined math and reading scores by about 6% of a standard deviation, with larger gains for disadvantaged children.
doi.org/10.1257/aer.102.5.1927

Supporting

Hoynes, H., Miller, D., & Simon, D (2015). Income, the Earned Income Tax Credit, and infant health. American Economic Journal: Economic Policy.
Observational
Increased EITC income reduced low birth weight and raised mean birth weight, with larger effects for Black mothers, partly via more prenatal care and less smoking.

Precedent Bridge

The equal-opportunity principle frames income-support policy; the causal evidence informs its developmental stakes.457 U.S. 202 (1982)

Limits & Counter-considerations

Gains are modest per dollar; some short-term child-health outcomes show mixed or null results; the EITC bundles income with changes in maternal employment, prenatal care, and insurance, so income is not cleanly isolated; and effects may differ for unconditional or differently-timed transfers.