1,566 people spent part of Christmas Day submitting their tax returns online, HM Revenue and Customs has said.
It is a 1% rise on the numbers on the same day last year.
The peak time on Christmas Day was from midday to 1pm.
17,000 people managed to find time on Christmas Eve - a 19% increase on 2012.
But there was a 4% decline on Boxing Day, with 4,493 preferring to sort their finances out than spend more money at the sales.