Six million hit by tax mistakes
Around 4.3 million people will be informed they have paid too much.
The tax office said it will begin sending notices to people in the coming days, informing them of the correct amount.
"The notices will tell them either that they are due a refund or that we will collect underpaid tax through their code for 2011-12," the HM Revenue & Customs (HMRC) said in a statement.
An amount of £2 billion has been underpaid through the Pay as You Earn (PAYE) system over the past two years -- an average of £1,500 per person for 1.4 million people.
Those who have overpaid could expect to get an average of £418.
HMRC said the differences arose because of a change in circumstances, such as a change of job.
"The vast majority of the 40 million people who pay through PAYE deductions are correctly taxed but because circumstances change during the year there will always be a minority who have paid either too much or too little," HMRC said.
The first 45,000 letters are expected to reach households on Tuesday.
Millions more will be sent over the next few months.
Campaigners said the magnitude of the mistake was unacceptable.
"It is completely unacceptable that a mistake of this magnitude could have happened," said Emma Boon, manager of the TaxPayers’ Alliance campaign.
"We’ve seen errors resulting in over or underpayments in the past, but the scale of this is shocking," Boon said.
Boon has called for taxation to be simplified.
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