About six million people are set to receive tax rebates averaging ?400, while another million will learn they have underpaid their tax by about ?600.
Her Majesty's Revenue and Customs (HMRC) said letters would begin going out in the next few months, with those owing money able to pay in stages.
It is the second year tax and National Insurance discrepancies have been identified by a new computer system.
HMRC said the number of cases would reduce "as the new system beds in".
Those who will be told they have underpaid tax are expected to owe between ?500 and ?600 on average.
BBC News - Millions more in line for tax rebates
what a joke our tax system ......
Her Majesty's Revenue and Customs (HMRC) said letters would begin going out in the next few months, with those owing money able to pay in stages.
It is the second year tax and National Insurance discrepancies have been identified by a new computer system.
HMRC said the number of cases would reduce "as the new system beds in".
Those who will be told they have underpaid tax are expected to owe between ?500 and ?600 on average.
BBC News - Millions more in line for tax rebates
what a joke our tax system ......
Its a contradiction in terms how can we be responsible for something we have no control over......................

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