Nearly two million taxpayers filed their self assessment returns online by the 31 January deadline, HM Revenue & Customs (HMRC) has said.
Online applications were up 38%, Revenue & Customs said
Overall, the number of online applications was 38% higher than the previous year.
More than 300,000 online applications were received in the week before the deadline, as taxpayers rushed to avoid an automatic £100 fine for late filing.
Nearly 900,000 taxpayers missed the deadline in 2005 and were fined.
In contrast with the previous two years, this time around there were no reports of taxpayers being unable to file online because of computer glitches.
"By managing the filing peak closely, enhancing our IT infrastructure and improving our system monitoring, we have successfully ensured that taxpayers have been able to file in time for the deadline," said Sir David Varney, HMRC chairman.
The total number of self assessment returns returned both on paper and electronically will not be known for several weeks, as paper returns are processed manually.
Only then will the number of people who have missed the deadline be known.
An estimated 9.5 million people have received returns for tax year 2004/2005.
In addition to the £100 automatic fine, people who did not pay their tax bill by 31 January will also be charged interest on money owed.