The zero effect of income tax on the timing of birth: some evidence on French data

The present paper investigates the correlation between the French tax rebate triggered by the birth of a child and the probability to bring forward childbirth from late December to early January. Using administrative tax data from 2010 to 2016, I precisely simulate the corresponding tax rebate for households in which a child was born from December 24 to January 7. Contrary to prior research, I do not find clear evidence of a significant link between the tax rebate brought about by a supplementary dependent child on the tax return and the probability of a late December birth. Either the amount of the incentive may not be large enough or households may not correctly anticipate the corresponding tax rebate. Nevertheless, a small learning effect is present. According to my results, a significant correlation between the tax rebate and the probability of having a child in December is observed among the wealthiest half of households with at least two children already claimed that also benefit from a relatively large tax rebate. However, this seems to be due to a spurious correlation. Instead, the results could reflect the willingness of parents to avoid childbirth on a public holiday.