Over one million people are about to be given the shock news they owe the taxman an average £600 each, while millions more will receive rebates of around £300 each.
Hundreds of thousands of students are starting or returning to university at present and those who had summer jobs should check now if they're owed overpaid tax.
An influential group of MPs has slammed poor service at HM Revenue and Customs (HMRC), highlighting long delays for taxpayers looking for help and errors by the government department.
Tens of thousands of graduates are being urged to claim money back after it emerged the Student Loans Company (SLC) has taken millions of pounds in overpayments.
Hundreds of thousands of taxpayers will get an extra month to make a payment due on Sunday and escape penalty because HM Revenue & Customs (HMRC) ran out of paper.
Some consumers are still reporting huge delays in trying to get through to the crucial HM Revenue and Customs (HMRC) tax credits helpline, but not to the same extent as in previous years.