We estimate the effect of subsidized childcare availability on Hungarian mothers' labor supply, using a discontinuity in kindergarten eligibility at age 3 of children. The effect is identified in a setting where policy intervention has a high potential impact, since maternal labor supply is very low under age 3 of children, but high for mothers with older children. We find that access to subsidized childcare increases maternal labor supply by 11.7 percentage points or 24%, an impact that is higher than what has been found in previous quasi-experimental studies from most other countries. However, the potential effectiveness of future childcare expansion under age 3 may be constrained by further institutional factors, such as very long parental leave, tradi-
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