The news comes on top of continued attempts by the Revenue to persuade as many as 10 million people to pay extra NI contributions to cover a mistake that jeopardises their right to a full basic state pension, the The Times reported.
On top of this over one million self assessment forms are still outstanding since the regime began seven years ago.
The NI figures emerged when paymaster general Dawn Primarolo responded to a written question from Liberal Democrat MP, Norman Lamb.
She explained that NI debts may be written off once it becomes ‘neither practical nor cost-effective to pursue the debt’.
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The firm says that the U-turn 'does not alter the need for a fundamental review of the way we tax work' and that the current tax system is in need of reform
Legislation on the NICs changes to be brought forward in the autumn following publication of 'the full effects of the changes to Class 2 and Class 4' in the summer
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