Maybe they aren't religious, hate their families or just found themselves with an hour to spare as the turkey roasted, but more than 1,500 did something not so typically festive this Christmas.
The number of people taking to the internet on Christmas Day to fill out their tax returns jumped by 40% this year, HM Revenue and Customs said.
A total of 1,548 people took time out from their turkey and presents to file their returns, compared with 1,100 taxpayers on Christmas Day 2011.
Christmas Eve was also a popular day for sorting out tax affairs, with 14,330 people sending an online tax return - more than treble the number who did so on the same day a year earlier.
And as the Boxing Day sales kicked off, 4,685 people decided to sit down at their computers and send their tax return over the internet, representing a year-on-year increase of a third.
A new HMRC campaign is urging anyone who still has not sent in their 2011-12 tax return to do so as soon as possible.
It forms part of HMRC's efforts to encourage 10.6 million people in self-assessment to submit their return online by the January 31 deadline.