Tax officials say the changes could mean up to 500, 000 parents having to complete self-assessment tax forms.
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Anyone who still has to file a self-assessment tax return must do so electronically by 31 January 2013.
But if they keep claiming it, then they will have to declare this in a self-assessment tax form.
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Millions of people in the UK fill in self-assessment tax forms each year.
It also argued that there would be added complexity as up to 500, 000 more people would have to complete self-assessment tax returns.
Those affected will need to fill out self-assessment tax forms for the current financial year - starting in April - to show they still qualify for the payments.
The chancellor has asked HM Revenue and Customs to look at how much has been raised by the 50p rate, but it will not be able to count this until this year's self-assessment tax returns are in after January next year.
For each tax year everyone who submits a self-assessment form after October, will have to do so online or face penalties.
Self-assessment involves completing a tax return in order to tell the HMRC about income and capital gains - profits on the sale of certain assets - or to claim tax allowances or reliefs against your tax bill.
The pervasive complexity level of our tax system creates a barrier for taxpayers, wealthy or not, in their annual self-assessment attempt to arrive at a substantially correct determination of their tax.
While self-assessment is all about getting our tax returns completed accurately and filed on time, it is also about paying the tax.
On February 13, 2012 one of my clients received the first 2010 CP-2000 (not-an-audit, but an attempt-to-resolve-a-discrepancy) proposing assessment of additional tax for 2010.
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The introduction of self-assessment has also raised income-tax receipts.
Last year, says the bank, real disposable incomes scarcely grew (in part because the introduction of self-assessment brought about an unexpected increase in tax payments).
Interestingly, the law never calls the opt-out payment a tax, but rather a fee or assessment.
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If a risk-based assessment reveals suspicions of a lack of tax compliance, financial intermediaries are to refuse to accept assets.
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The self-assessment returns from January, when most income tax is paid by the better-off, have been eagerly awaited by the Treasury and government ministers as they provide the first evidence of the success, or failure, of the 50p rate.
If you're one of the nine million people who won the tax-version of the national lottery and received your own self-assessment pack from Hector (or his replacement, Mrs Doyle), you'll be wondering what to do with your prize.
The committee said that the tax authority received 79 million calls in 2011-12 about issues such as self-assessment forms, but 20 million of these calls were not answered.
Previously under the self-assessment rules, you could avoid the penalty charge for a late filed tax return if all the tax payable had in fact been settled.
But in between came the defeat by the unions of Christian Sautter, Mr Strauss-Kahn's successor, in his attempt to reform a tax system which has different institutions for assessment and collection and is therefore both inefficient and costly.
But my tax affairs are very simple so the one thing I don't really want to do is the self-assessment thing.
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