(BLOOMBERG) — Death and taxes aren’t only certain, they also seem to share a same deadline in the U.S., according to a study that points to the role of stress in fatal accidents.

Deaths from traffic accidents around April 15, traditionally the last day to file individual income taxes in the U.S., rose 6 percent on average on each of the last 30 years of tax filing days compared with a day during the week prior and a week later, according to research published today in the Journal of the American Medical Association.

Even allowing Americans to file their taxes electronically hasn’t negated the crash trend, lead researcher Donald Redelmeier said. The findings suggest stress, lack of sleep, alcohol use and less tolerance to other drivers on tax deadline day may contribute to an increase in deaths on the road, Redelmeier said.

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